CN108483801B - Method for removing ammonia nitrogen in low-temperature wastewater based on ammonia nitrogen adsorption and enhanced biological regeneration - Google Patents
Method for removing ammonia nitrogen in low-temperature wastewater based on ammonia nitrogen adsorption and enhanced biological regeneration Download PDFInfo
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Abstract
The invention belongs to the technical field of wastewater treatment, and discloses a method for removing ammonia nitrogen in low-temperature wastewater based on ammonia nitrogen adsorption and enhanced biological regeneration. The method comprises the following steps: (1) nitrifying sludge culture is carried out at the middle temperature of the aeration biological device; (2) introducing the low-temperature ammonia nitrogen wastewater into an adsorption device containing ammonia nitrogen adsorption filler, adsorbing, and discharging, wherein the ammonia nitrogen concentration of effluent is less than 5 mg/L; the ammonia nitrogen concentration of the effluent is more than or equal to 5mg/L, and the water inlet is stopped; (3) adding alkalinity, wherein wastewater with the alkalinity enters the aeration biological device from the adsorption device, carrying out moderate temperature biochemical reaction, then introducing the wastewater into the adsorption device, and continuously circulating the wastewater in the two devices; (4) when the sum of the concentration of nitrite nitrogen and nitrate nitrogen in the wastewater is more than or equal to 150mg/L, the wastewater is discharged, the two devices carry out low-temperature ammonia nitrogen wastewater treatment in the next period, and the aeration biological device keeps the medium temperature in the whole wastewater treatment process. The method is simple, the regeneration efficiency of the ammonia nitrogen adsorption filler is high, and the low-temperature ammonia nitrogen wastewater is treated stably and reaches the standard.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, relates to a method for removing ammonia nitrogen in low-temperature wastewater, and particularly relates to a method for adsorbing ammonia nitrogen by using a filler (such as zeolite) and removing ammonia nitrogen in low-temperature wastewater by using enhanced biological regeneration of the filler.
Background
The activity of microorganisms, particularly nitrifying bacteria for wastewater treatment at low temperature is inhibited, and in winter, the ammonia nitrogen in the effluent of domestic sewage treatment plants is difficult to reach the standard due to low temperature of the sewage. The adsorption of the zeolite on ammonia nitrogen is less influenced by temperature, and the zeolite can be used for adsorbing low-temperature ammonia nitrogen-containing wastewater to ensure that the ammonia nitrogen in the effluent reaches the standard. However, the adsorption capacity of zeolite to ammonia nitrogen is limited, so that the zeolite saturated in ammonia nitrogen adsorption needs to be regenerated to improve the utilization rate of zeolite. The zeolite regeneration can desorb and enrich the ammonia nitrogen adsorbed in the zeolite, and if the desorbed ammonia nitrogen is treated in a centralized manner, the purposes of reducing the treated water quantity and saving the treatment cost can be achieved.
The zeolite can be regenerated by physical regeneration, chemical regeneration and electrochemical regeneration, such as high-temperature calcination, solvent extraction, electrolytic regeneration and the like, but the cost is high and the operation is complex. The zeolite can also be regenerated by organisms, and the biological regeneration is the coupling of chemical ion exchange and microorganism metabolism, and has the advantages of simple operation, low treatment cost and strong operability. The biological regeneration period of the single adsorption of the ammonia nitrogen filler (such as zeolite) is long, the regeneration efficiency is low, and the requirement of continuously treating a large amount of low-temperature wastewater is difficult to meet.
According to the invention, an adsorption device filled with ammonia nitrogen adsorption filler is connected in series with an aeration biological device for keeping medium temperature, when filler regeneration is carried out, wastewater in the two devices forms circulation, the aeration biological device is heated by a heating device, so that the aeration biological device keeps the medium temperature and the constant temperature in the whole wastewater treatment process, in the water circulation process, the water temperature of the adsorption device is raised, the microbial activity is recovered quickly, meanwhile, nitrobacteria are inoculated into the adsorption device, the conversion of ammonia nitrogen is greatly promoted, the high-efficiency regeneration of the ammonia nitrogen adsorption filler is realized, the treatment cost is low, and the effect of efficiently removing the ammonia nitrogen in the low-temperature wastewater is achieved.
Disclosure of Invention
In order to overcome the problems that the wastewater containing ammonia nitrogen is difficult to biochemically treat and discharge after reaching standards at low temperature and the defects of low in-situ biological regeneration efficiency of adsorbed ammonia nitrogen fillers (such as zeolite), the invention aims to provide a method for removing ammonia nitrogen in the low-temperature wastewater based on ammonia nitrogen adsorption and enhanced biological regeneration. According to the invention, when the ammonia nitrogen adsorption filler is regenerated, an ammonia nitrogen adsorption device (a device filled with the ammonia nitrogen adsorption filler) and a high-efficiency nitrification aeration biological device which operates under a medium-temperature condition are connected in series, wastewater in the two devices forms circulation, and through the series operation mode (namely the wastewater circulates between the ammonia nitrogen adsorption device and the aeration biological device), the temperature of the adsorption device is improved, wherein the microbial activity is recovered quickly, the ammonia nitrogen in the regeneration liquid (circulation wastewater) is biotransformed, the concentration difference between the inside of the ammonia nitrogen adsorption filler and the ammonia nitrogen in the regeneration liquid (circulation wastewater) is increased, the diffusion and the conversion of the ammonia nitrogen adsorbed in the ammonia nitrogen adsorption filler to the regeneration liquid (circulation wastewater) are accelerated, and the biological regeneration of the ammonia nitrogen adsorption filler is accelerated.
The purpose of the invention is realized by the following technical scheme:
a method for removing ammonia nitrogen in low-temperature wastewater based on ammonia nitrogen adsorption and enhanced biological regeneration comprises the following steps:
(1) inoculating nitrified sludge into an aeration biological device filled with fillers, and culturing by hanging a membrane;
(2) introducing the low-temperature ammonia nitrogen wastewater into an adsorption device filled with ammonia nitrogen adsorption filler, adsorbing ammonia nitrogen in the low-temperature ammonia nitrogen wastewater by using the ammonia nitrogen adsorption filler, gradually increasing the concentration of ammonia nitrogen in effluent along with the adsorption, and directly discharging the effluent when the concentration of ammonia nitrogen in the effluent is less than 5 mg/L; when the concentration of ammonia nitrogen in the effluent is more than or equal to 5mg/L, stopping water inflow, and at the moment, loading ammonia nitrogen wastewater in the adsorption device;
(3) adding alkalinity into the adsorption device filled with the ammonia nitrogen wastewater in the step (2), then introducing the ammonia nitrogen wastewater added with the alkalinity into the aeration biological device in the step (1), carrying out moderate-temperature biochemical reaction, and then introducing the wastewater subjected to the biochemical reaction in the aeration biological device into the adsorption device, so that the wastewater continuously circulates in the adsorption device and the aeration biological device; in the circulating process, although the adsorption device is not heated by the heating device, due to the medium temperature condition in the aeration biological device, when the wastewater in the aeration biological device circulates to the adsorption device, the temperature of the adsorption device is raised, and ammonia nitrogen is continuously converted by microorganisms;
(4) after circulating operation, when the concentration sum of nitrite nitrogen and nitrate nitrogen in the wastewater in the adsorption device and the aeration biological device in the step (3) is more than or equal to 150mg/L, discharging the wastewater in the two devices, and completing the regeneration of the ammonia nitrogen adsorption filler in the adsorption device;
(5) carrying out low-temperature ammonia nitrogen wastewater treatment of the next period on the adsorption device for completing the regeneration of the ammonia nitrogen adsorption filler in the step (4) and the aeration biological device for discharging wastewater;
the treatment of the low-temperature ammonia nitrogen wastewater in the next period specifically comprises the steps of introducing the low-temperature ammonia nitrogen wastewater into the adsorption device for completing the regeneration of the ammonia nitrogen adsorption filler in the step (4), and repeating the steps (2) to (4); thus continuously treating the low-temperature ammonia nitrogen wastewater; the aeration biological device in the low-temperature ammonia nitrogen wastewater treatment of the next period is an aeration biological device for discharging wastewater of the previous period.
The membrane hanging culture in the step (1) comprises the following specific steps:
inoculating nitrified sludge into an aeration biological device filled with filler, aerating, continuously feeding water, adding alkalinity, aerating for biochemical reaction, and finishing biofilm culturing when more than half of ammonia nitrogen in the fed water is converted into nitrite nitrogen and nitrate nitrogen. Alkalinity, as CaCO3Measured to be 7-8 times of the ammonia nitrogen concentration; during biochemical reaction, the concentration of dissolved oxygen is 2-8 mg/L, and the temperature is 20-35 ℃.
The adsorption device provided with the ammonia nitrogen adsorption filler in the step (2) is arrangedPerforming biofilm culturing before introducing the low-temperature ammonia nitrogen wastewater; the method comprises the following specific steps of biological biofilm culturing: inoculating nitrified sludge into an adsorption device filled with ammonia nitrogen adsorption filler, aerating, continuously feeding water, adding alkalinity, aerating to carry out biochemical reaction, and completing biofilm culturing when more than half of ammonia nitrogen in the fed water is converted into nitrite nitrogen and nitrate nitrogen. Alkalinity, as CaCO3The concentration of the ammonia nitrogen is 7-8 times of that of the ammonia nitrogen; during biochemical reaction, the concentration of dissolved oxygen is 2-8 mg/L, and the temperature is 20-35 ℃. The nitrified sludge is domesticated mature nitrified sludge, namely the removal rate of ammonia nitrogen in the ammonia nitrogen wastewater can reach more than 90%.
The ammonia nitrogen concentration in the low-temperature ammonia nitrogen wastewater in the step (2) is 5-60 mg/L, preferably 6-60 mg/L; the temperature of the low-temperature ammonia nitrogen wastewater is less than or equal to 16 ℃, preferably 5-16 ℃, and more preferably 5-15 ℃.
The conditions for carrying out the moderate temperature biochemical reaction in the aeration biological device in the step (3) are as follows: the temperature is 20-35 ℃, and the concentration of dissolved oxygen is 2-8 mg/L;
the adding amount of the alkalinity in the step (3) meets the following requirements: the mass ratio of the alkalinity to the ammonia nitrogen is (8-12): 1.
and (4) when the wastewater in the step (3) is circulated to an adsorption device filled with the ammonia nitrogen adsorption filler, treating the wastewater under the condition that the dissolved oxygen concentration is 2-8 mg/L.
In the method, in the whole process of wastewater treatment, the aeration biological device is heated by the heating device and is always in a medium-temperature condition, wherein the medium-temperature is 20-35 ℃; the wastewater treatment comprises ammonia nitrogen adsorption, biochemical reaction and regeneration of ammonia nitrogen adsorption filler in the wastewater; but also from one cycle of wastewater treatment to the next.
The number of the adsorption devices in the step (2) is more than or equal to 1, and the number is an integer; when a plurality of adsorption devices are arranged, the aeration biological device and one adsorption device complete the regeneration of the ammonia nitrogen adsorption filler, and the aeration biological device and the other adsorption device perform the regeneration of the ammonia nitrogen adsorption filler; the regeneration of the ammonia nitrogen adsorption filler refers to the regeneration of the ammonia nitrogen adsorption filler realized by operating according to the steps (3) and (4); the ammonia nitrogen filler regeneration is carried out alternately by a plurality of adsorption devices;
the plurality of adsorption devices are adsorption devices which respectively perform adsorption according to the step (2) and stop water inflow.
The nitrified sludge in the step (1) is domesticated mature nitrified sludge, namely the removal rate of ammonia nitrogen in the ammonia nitrogen wastewater can reach more than 90%.
And (3) in the step (2), the filling height of the ammonia nitrogen adsorption filler in the adsorption device filled with the ammonia nitrogen adsorption filler is 1-3 m.
And (4) after the wastewater in the two devices is discharged in the step (4), backwashing is carried out on the adsorption device.
The device adopted by the method comprises an adsorption device filled with ammonia nitrogen adsorption filler, an aeration biological device and a wastewater collection device, wherein the upper end of the adsorption device is connected with the lower end of the aeration biological device through a pipeline, and a pump is arranged on the pipeline; the lower end of the adsorption device is connected with the upper end of the aeration biological device through a pipeline, and a circulating pump is arranged on the pipeline; aeration devices are arranged at the bottoms of the adsorption device and the aeration biological device; the adsorption device is provided with a water inlet and a water outlet, and the water outlet is connected with the wastewater collection device; the aeration biological device is provided with a water outlet which is connected with a wastewater collecting device. And a heating device is arranged outside the aeration biological device and is used for heating the wastewater in the aeration biological device.
The invention uses ammonia nitrogen adsorption filler (such as natural zeolite filler) in the adsorption device to adsorb ammonia nitrogen in low-temperature ammonia nitrogen wastewater, and the adsorption device with saturated adsorption is connected with the aeration biological device to realize the circulation of wastewater in the two devices, thereby strengthening the desorption and biological regeneration of ammonia nitrogen in the ammonia nitrogen adsorption filler (such as zeolite). The cyclic operation of the two devices can accelerate the conversion of ammonia nitrogen in the aeration biological device, increase the concentration difference between the inside of the ammonia nitrogen adsorption filler (such as zeolite) and the ammonia nitrogen of the regeneration liquid (cyclic wastewater), and promote the diffusion and the conversion of the adsorbed ammonia nitrogen in the zeolite to the regeneration liquid.
According to the aeration biological device which runs under the normal temperature condition and is rich in a large amount of nitrifying microorganisms, when waste water between the two devices circulates, on one hand, the temperature of the adsorption device can be increased, so that the microorganisms in the aeration biological device can quickly recover the activity, and meanwhile, the possibility of inoculating nitrifying bacteria to the ammonia nitrogen adsorption filler (such as a zeolite filter layer) exists, and the in-situ biological regeneration of the ammonia nitrogen adsorption filler (such as zeolite) is accelerated; on the other hand, the ammonia nitrogen concentration in the wastewater of the aeration biological device can be quickly reduced, the ammonia nitrogen concentration difference between the surface of the ammonia nitrogen adsorption filler and the regenerated liquid (circulating wastewater) is increased, the ammonia nitrogen in the ammonia nitrogen adsorption filler is transferred and diffused to the wastewater with lower ammonia nitrogen concentration (the wastewater in the aeration biological device, the lower concentration is because the ammonia nitrogen in the aeration biological device is converted to nitrite nitrogen and nitrate nitrogen, and when the wastewater in the aeration biological filter is circulated to the adsorption device, the ammonia nitrogen concentration in the ammonia nitrogen adsorption filler is higher than the concentration of the wastewater from the aeration biological filter), and then the wastewater is converted by the aeration biological device with nitrification effect, so that the aim of quick biological regeneration is fulfilled.
If the adsorption and the conversion of ammonia nitrogen are carried out in the same device, the efficiency is lower. The method can quickly convert ammonia nitrogen into nitrate nitrogen and nitrite nitrogen, so that the ammonia nitrogen concentration in the wastewater of the aeration biological filter is reduced, the ammonia nitrogen concentration difference between the interior of the ammonia nitrogen adsorption filler and the wastewater from the aeration biological filter can be increased, the ammonia nitrogen desorption rate in the ammonia nitrogen adsorption filler is improved, and the regeneration efficiency of the ammonia nitrogen adsorption filler is greatly improved. The regeneration efficiency of the invention is 2-6 times of that of the same device.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the method is suitable for treating low-temperature ammonia nitrogen wastewater, and ensures that the ammonia nitrogen in the effluent reaches the standard and is not influenced by low temperature;
(2) the invention improves the in-situ regeneration efficiency of the ammonia nitrogen adsorption filler after adsorbing ammonia nitrogen, and the regeneration efficiency of the invention (the double-aeration biological filter is connected in series, namely two devices are adopted for adsorption and conversion, and wastewater circulates in the two devices) in unit time is 2-6 times of that of a single zeolite aeration biological filter;
(3) the method of the invention has the advantages of simplicity, high efficiency, low investment cost, energy saving, consumption reduction and stable and reliable effect.
Drawings
FIG. 1 is a schematic diagram of an apparatus used in a method for removing ammonia nitrogen in low-temperature wastewater based on ammonia nitrogen adsorption and enhanced biological regeneration of the invention; wherein, the method comprises the following steps of 1-an adsorption device, 2-ammonia nitrogen adsorption filler, 3-a pump, 4-a valve, 5-a wastewater collection device, 6-a blower, 7-an aeration biological device, 8-filler (ceramsite), 9-a circulating pump, 10-a valve and 11-a heating device (constant temperature);
FIG. 2 is a schematic diagram of the apparatus used in the method for removing ammonia nitrogen from low-temperature wastewater in comparative examples 1 to 3; wherein, the method comprises the following steps of 1-an adsorption device, 2-ammonia nitrogen adsorption filler, 3-a pump, 4-a valve, 5-a wastewater collection device, 6-a blower and 7-a heating device (constant temperature);
FIG. 3 is a graph showing the effect of zeolite regeneration in each apparatus when ammonia nitrogen in ammonia nitrogen wastewater at different low temperatures is treated by the apparatus of example 1 and the apparatus of comparative example 1; the left ordinate represents the proportion of different forms of nitrogen in the reformate and the right ordinate represents the regeneration rate of the zeolite; column a corresponds to the proportion of the reprocessed product of comparative example 1 and column b corresponds to the proportion of the reprocessed product of example 1; the black dots in the a column correspond to the regeneration rate of comparative example 1, and the black dots above the b column correspond to the regeneration rate of example 1;
FIG. 4 is a graph showing the effect of zeolite regeneration in each apparatus when ammonia nitrogen in ammonia nitrogen wastewater at different low temperatures is treated by the apparatus of example 2 and the apparatus of comparative example 2; the mass of the regenerated product is shown on the left ordinate and the regeneration rate of the zeolite is shown on the right ordinate; the a column corresponds to the mass of the reproducts of comparative example 2, and the b column represents the mass of the reproducts of example 2; the triangular black dots in the a column correspond to the regeneration rate of comparative example 2, and the triangular black dots in the b column correspond to the regeneration rate of example 2;
FIG. 5 is a graph showing the effect of zeolite regeneration in each apparatus when ammonia nitrogen in ammonia nitrogen wastewater at different low temperatures is treated by the apparatus of example 3 and the apparatus of comparative example 3; the mass of the regenerated product is shown on the left ordinate and the regeneration rate of the zeolite is shown on the right ordinate; the a-column corresponds to the mass of the reformate in comparative example 3, and the b-column represents the mass of the reformate in example 3; the triangular black dots in the a-column correspond to the regeneration rate of comparative example 3, and the triangular black dots in the b-column correspond to the regeneration rate of example 3.
Detailed Description
The present invention will be further described with reference to the following specific examples and drawings, but the embodiments of the present invention are not limited thereto.
The device adopted by the method and the devices adopted by the embodiments 1-3 are shown in figure 1, and comprise an adsorption device 1 filled with ammonia nitrogen adsorption filler 2, an aeration biological device 7 and a wastewater collection device 5, wherein the upper end of the adsorption device 1 is connected with the lower end of the aeration biological device 7 through a pipeline, a pump 3 is arranged on the pipeline, and a valve 4 is arranged on the pipeline; the lower end of the adsorption device 1 is connected with the upper end of the aeration biological device 7 through a pipeline, a circulating pump 9 is arranged on the pipeline, and a valve 10 is arranged on the pipeline; the bottom parts of the adsorption device 1 and the aeration biological device 7 are provided with aeration devices 6 (comprising blowers); the adsorption device 1 is provided with a water inlet and a water outlet, and the water outlet is connected with a wastewater collection device 5; the aeration biological device 7 is provided with a water outlet which is connected with the wastewater collecting device 5. And a heating device 11 is arranged outside the biological aeration device and is used for heating the wastewater in the biological aeration device. The aeration biological device is filled with a filler 8, preferably ceramsite.
The process for removing the low-temperature wastewater by adopting the device comprises the following steps: (1) respectively inoculating the nitrified sludge into an adsorption device filled with the ammonia nitrogen adsorption filler and an aeration biological device filled with the filler, and performing biofilm culturing; (2) then introducing the low-temperature ammonia nitrogen wastewater into an adsorption device from a water inlet of the adsorption device for adsorption (if the temperature of the wastewater is lower, if the adsorption device is cultured, microorganisms in the adsorption device are difficult to carry out biochemical reaction, and mainly ammonia nitrogen in the wastewater is adsorbed by an ammonia nitrogen adsorption filler), and directly discharging the low-temperature ammonia nitrogen wastewater to a wastewater collection device when the concentration of the ammonia nitrogen in effluent is less than 5 mg/L; when the concentration of ammonia nitrogen in the effluent is more than or equal to 5mg/L, stopping water inflow, and at the moment, loading ammonia nitrogen wastewater into the adsorption device (when adsorption is carried out, the aeration device can aerate the wastewater or not aerate the wastewater); (3) adding alkalinity into the adsorption device filled with the ammonia nitrogen wastewater in the step (2), then feeding the ammonia nitrogen wastewater with the alkalinity into the aeration biological device (the lower end of the aeration biological device) in the step (1) from the upper part of an ammonia nitrogen adsorption packing layer of the adsorption device through a pipeline under the action of a pump, performing biochemical reaction at a medium temperature (heating of a heating device and aeration of the aeration device), and then feeding the wastewater subjected to the biochemical reaction in the aeration biological device into the adsorption device (the lower end of the adsorption device) from the upper part of a ceramsite packing layer through a pipeline under the action of a circulating pump, so that the wastewater continuously circulates in the adsorption device and the aeration biological device (the aeration device aerates the adsorption device and the aeration biological device in the circulating process); (4) after the cyclic operation, when the concentration sum of nitrite nitrogen and nitrate nitrogen in the wastewater in the adsorption device and the aeration biological device in the step (3) reaches 150mg/L, discharging the wastewater in the two devices, performing back flushing on the adsorption device, and performing low-temperature ammonia nitrogen wastewater treatment of the next period on the back-flushed adsorption device and the aeration biological device for discharging the wastewater; (5) the treatment of the low-temperature ammonia nitrogen wastewater in the next period specifically comprises the steps of introducing the low-temperature ammonia nitrogen wastewater into the backwashing adsorption device in the step (4), and repeating the steps (2) to (4); thus continuously treating the low-temperature ammonia nitrogen wastewater; the aeration biological device in the low-temperature ammonia nitrogen wastewater treatment of the next period is an aeration biological device for discharging wastewater of the previous period. In the whole process of wastewater treatment (from biofilm culturing, wastewater adsorption, biochemical reaction, regeneration of ammonia nitrogen adsorption filler to the treatment of discharged wastewater and wastewater entering the next period), the aeration biological device adopts a heating device to heat and keep the temperature at a middle temperature all the time.
The device adopted in the comparative examples 1-3 is shown in figure 2, and comprises an adsorption device 1 (such as a biological aerated filter with zeolite) with ammonia nitrogen adsorption filler and a wastewater collection device 5, wherein the upper end (above a filler layer 2) and the lower end (below the filler layer 2) of the adsorption device 1 are connected through a pipeline, an external circulating pump 3 (pump) and a valve 4 are arranged on the pipeline, and under the action of the external circulating pump 3, liquid below a material layer 2 in the adsorption device 1 and liquid above the filler layer 2 realize circulation through the pipeline outside the device; the bottom of the adsorption device 1 is provided with an aeration device 6 (comprising a blower); the adsorption device 1 is provided with a water inlet and a water outlet, and the water outlet is connected with a wastewater collection device 5. And a heating device 7 is arranged outside the adsorption device 1 and used for heating the wastewater in the adsorption device.
The wastewater treatment process in the comparative example comprises the following steps: (a) inoculating nitrified sludge into an adsorption device filled with ammonia nitrogen adsorption filler, and culturing by hanging a membrane; (b) then introducing the low-temperature ammonia nitrogen wastewater into an adsorption device from a water inlet of the adsorption device for adsorption, and directly discharging the low-temperature ammonia nitrogen wastewater to a wastewater collection device when the concentration of ammonia nitrogen in effluent is less than 5 mg/L; when the concentration of ammonia nitrogen in the effluent is more than or equal to 5mg/L, stopping water inflow, and at the moment, loading ammonia nitrogen wastewater in the adsorption device; (c) adding alkalinity into the adsorption device filled with the ammonia nitrogen wastewater in the step (b), heating the wastewater in the adsorption device by using a heating device to a medium temperature, then circulating the liquid above and below an ammonia nitrogen adsorption packing layer in the adsorption device through a pipeline under the action of an external circulating pump, aerating by using an aeration device during circulation, and carrying out biochemical reaction in the adsorption device, so that the wastewater continuously circulates above and below the ammonia nitrogen adsorption packing of the adsorption device; (d) after circulating operation, when the concentration sum of nitrite nitrogen and nitrate nitrogen of the wastewater of the adsorption device reaches 150mg/L, discharging the wastewater in the device to a wastewater collection device, and backwashing the adsorption device; (e) introducing the low-temperature ammonia nitrogen wastewater into the backwashing adsorption device in the step (d), and repeating the steps (b) to (d); thus continuously treating the low-temperature ammonia nitrogen wastewater.
Example 1 aeration biological device and adsorption device in series
A method for adsorbing ammonia nitrogen and removing ammonia nitrogen in low-temperature wastewater based on zeolite and enhancing biological regeneration comprises the following steps:
(1) inoculating nitrated sludge (the sludge concentration is 4000-3Measured) 240mg/L, the concentration of dissolved oxygen is 2-8 mg/L, the temperature is 20-35 ℃, and when more than 90% of ammonia nitrogen in inlet water is converted into nitrite nitrogen and nitrate nitrogen, the biofilm culturing is completed;
inoculating nitrified sludge into adsorption device (zeolite aeration biological filter column) filled with zeolite, aeration for 3 days, continuously feeding water, wherein the ammonia nitrogen concentration of the fed water is 30mg/L, and adding alkalinity (as CaCO)3Calculated) 240mg/L, the dissolved oxygen concentration is 2-8 mg/L, and the temperature is 20-35When half of ammonia nitrogen in the inlet water is converted into nitrite nitrogen and nitrate nitrogen, the biofilm culturing is finished;
(2) introducing low-temperature ammonia nitrogen wastewater (the ammonia nitrogen concentration is 30mg/L, the temperatures are respectively 5 ℃, 10 ℃, 12 ℃ and 16 ℃) into an adsorption device filled with zeolite, adsorbing ammonia nitrogen in the low-temperature ammonia nitrogen wastewater by the zeolite (the adsorption time is 6h), gradually increasing the ammonia nitrogen concentration in effluent along with the adsorption, and directly discharging when the ammonia nitrogen concentration in the effluent is less than 5 mg/L; when the concentration of ammonia nitrogen in the effluent is more than or equal to 5mg/L, stopping water inflow, and at the moment, loading ammonia nitrogen wastewater in the adsorption device;
(3) adding the mixture into the adsorption device filled with the zeolite in the step (2) according to the ratio of alkalinity/ammonia nitrogen to 8: 1 adding NaHCO with corresponding mass3Then, introducing the ammonia nitrogen wastewater added with alkalinity into the aeration biological device in the step (1), performing biochemical reaction at the temperature of 20 ℃, and then introducing the wastewater subjected to biochemical reaction in the aeration biological device into the adsorption device, so that the wastewater continuously circulates in the adsorption device and the aeration biological device; in the circulating process, 2-8 mg/L of dissolved oxygen in the wastewater in the adsorption device and the aeration biological device;
(4) after the cyclic operation, when the concentration sum of nitrite nitrogen and nitrate nitrogen in the wastewater in the adsorption device and the biological aeration device in the step (3) reaches 150mg/L, discharging the wastewater in the two devices, performing back flushing on the adsorption device, and performing low-temperature ammonia nitrogen wastewater treatment of the next period on the back-flushed adsorption device and the biological aeration device for discharging the wastewater (in the embodiment, the in-situ regeneration time of zeolite is 24 hours);
(5) the treatment of the low-temperature ammonia nitrogen wastewater in the next period specifically comprises the steps of introducing the low-temperature ammonia nitrogen wastewater into the backwashing adsorption device in the step (4), and repeating the steps (2) to (4); thus continuously treating the low-temperature ammonia nitrogen wastewater; the aeration biological device in the low-temperature ammonia nitrogen wastewater treatment of the next period is an aeration biological device for discharging wastewater of the previous period. In the whole process of wastewater treatment (from biofilm culturing, wastewater adsorption, biochemical reaction, regeneration of ammonia nitrogen adsorption filler to the treatment of discharged wastewater and wastewater entering the next period), the aeration biological device adopts a heating device to heat and keep the temperature at a middle temperature all the time. The pH value of the low-temperature wastewater is 6-9.
Comparative example 1 Single adsorption apparatus
A method for removing ammonia nitrogen in low-temperature wastewater comprises the following steps:
(1) inoculating nitrified sludge into an adsorption device (an aeration filter column filled with zeolite filler, wherein the filler accounts for 1/2-2/3 of the volume of the filter column), aeration for 3 days, continuously feeding water, wherein the ammonia nitrogen concentration of the fed water is 30mg/L, and adding alkalinity (CaCO)3Metering) 240mg/L, the concentration of dissolved oxygen is 2-8 mg/L, the temperature is 20-35 ℃, and when half of ammonia nitrogen in inlet water is converted into nitrite nitrogen and nitrate nitrogen, the biofilm culturing is completed;
(2) introducing low-temperature ammonia nitrogen wastewater (the ammonia nitrogen concentration is 30mg/L, the temperatures are respectively 5 ℃, 10 ℃, 12 ℃ and 16 ℃) into an adsorption device filled with zeolite, adsorbing ammonia nitrogen in the low-temperature ammonia nitrogen wastewater by the zeolite (the adsorption time is 6h), gradually increasing the ammonia nitrogen concentration in effluent along with the adsorption, and directly discharging when the ammonia nitrogen concentration in the effluent is less than 5 mg/L; when the concentration of ammonia nitrogen in the effluent is more than or equal to 5mg/L, stopping water inflow, and at the moment, loading ammonia nitrogen wastewater in the adsorption device;
(3) heating the adsorption device filled with zeolite in the step (2), and adding the zeolite into the adsorption device filled with zeolite in the step (2) according to the alkalinity/ammonia nitrogen ratio of 8: 1 adding NaHCO with corresponding mass3Then, the liquid above and below the zeolite packing layer is circulated through an external circulating pump and a pipeline, so that the wastewater continuously circulates above and below the ammonia nitrogen adsorption packing of the adsorption device; in the circulating process, 2-8 mg/L of dissolved oxygen is generated, and the temperature of biochemical reaction is 20 ℃;
(4) after the cyclic operation, when the concentration sum of the nitrite nitrogen and the nitrate nitrogen in the wastewater in the adsorption device in the step (3) reaches 150mg/L (in the embodiment, the in-situ regeneration time of the zeolite is 24 hours), discharging the wastewater in the device and performing back washing;
(5) introducing the low-temperature ammonia nitrogen wastewater into the backwashing absorption device in the step (4), and repeating the steps (2) to (4); thus continuously treating the low-temperature ammonia nitrogen wastewater.
The graph of the effect of in-situ regeneration of zeolite when ammonia nitrogen in wastewater at different low temperatures is removed in example 1 and comparative example 1 is shown in fig. 3. FIG. 3 is a graph showing the effect of zeolite regeneration in each apparatus when ammonia nitrogen in ammonia nitrogen wastewater at different low temperatures is treated by the apparatus of example 1 and the apparatus of comparative example 1.
As can be seen from FIG. 3, at temperatures of 5 ℃ and 10 ℃ and with the dual aeration biological filter columns connected in series (the aeration biological device of example 1 is connected in series with the adsorption device of zeolite, and when the zeolite is regenerated, the wastewater in the device is circulated), the in-situ regeneration efficiency of the zeolite is 5-6 times that of the single zeolite aeration biological filter column (the adsorption device of the single zeolite of comparative example 1). Wherein when the temperature is lower than 10 ℃, the activity of the microorganism is inhibited, and the regeneration efficiency of a single zeolite aeration biological filter column is low and is only 4 percent; and the in-situ regeneration efficiency of the zeolite is about 23 percent under the condition that the double-aeration biological filter columns are connected in series. When the temperature is 12 ℃ and 16 ℃, the microbial activity is inhibited to a lower degree, the regeneration efficiency of the single zeolite aeration biological filter column is respectively 13.96 percent and 15.71 percent higher, and the in-situ regeneration efficiency of the zeolite under the series connection of the double aeration biological filter columns is respectively 24.97 percent and 28.49 percent.
Example 2 biological aeration apparatus and adsorption apparatus series connection
A method for adsorbing ammonia nitrogen and removing ammonia nitrogen in low-temperature wastewater based on zeolite and enhancing biological regeneration comprises the following steps:
(1) inoculating nitrated sludge (the sludge concentration is 4000-3Measured) 240mg/L, the concentration of dissolved oxygen is 2-8 mg/L, the temperature is 20-35 ℃, and when more than 90% of ammonia nitrogen in inlet water is converted into nitrite nitrogen and nitrate nitrogen, the biofilm culturing is completed;
inoculating nitrified sludge into adsorption device (zeolite aeration biological filter column) filled with zeolite, aeration for 3 days, continuously feeding water, wherein the ammonia nitrogen concentration of the fed water is 30mg/L, and adding alkalinity (as CaCO)3Metering) 240mg/L, the concentration of dissolved oxygen is 2-8 mg/L, the temperature is 20-35 ℃, and when half of ammonia nitrogen in inlet water is converted into nitrite nitrogen and nitrate nitrogen, the biofilm culturing is completed;
(2) introducing low-temperature ammonia nitrogen wastewater (the ammonia nitrogen concentration is 30mg/L, the temperature is respectively 8 ℃ and 10 ℃) into an adsorption device filled with zeolite, adsorbing ammonia nitrogen in the low-temperature ammonia nitrogen wastewater by the zeolite (the adsorption time is 4 hours), gradually increasing the ammonia nitrogen concentration in effluent along with the adsorption, and directly discharging when the ammonia nitrogen concentration in the effluent is less than 5 mg/L; when the concentration of ammonia nitrogen in the effluent is more than or equal to 5mg/L, stopping water inflow, and at the moment, loading ammonia nitrogen wastewater in the adsorption device;
(3) adding the mixture into the adsorption device filled with the zeolite in the step (2) according to the ratio of alkalinity/ammonia nitrogen to 8: 1 adding NaHCO with corresponding mass3Then, introducing the ammonia nitrogen wastewater added with alkalinity into the aeration biological device in the step (1), performing biochemical reaction at 28 ℃, and then introducing the wastewater subjected to biochemical reaction in the aeration biological device into the adsorption device, so that the wastewater continuously circulates in the adsorption device and the aeration biological device; in the circulating process, the dissolved oxygen concentration of the wastewater in the adsorption device and the aeration biological device is 2-8 mg/L;
(4) after the cyclic operation, when the concentration sum of nitrite nitrogen and nitrate nitrogen in the wastewater in the adsorption device and the biological aeration device in the step (3) reaches 150mg/L, discharging the wastewater in the two devices, performing back flushing on the adsorption device, and performing in-situ regeneration on the zeolite in the next period of low-temperature ammonia nitrogen wastewater treatment in the embodiment by using the back-flushed adsorption device and the biological aeration device for discharging the wastewater for 24 h;
(5) the treatment of the low-temperature ammonia nitrogen wastewater in the next period specifically comprises the steps of introducing the low-temperature ammonia nitrogen wastewater into the backwashing adsorption device in the step (4), and repeating the steps (2) to (4); thus continuously treating the low-temperature ammonia nitrogen wastewater; the aeration biological device in the low-temperature ammonia nitrogen wastewater treatment of the next period is an aeration biological device for discharging wastewater of the previous period. In the whole process of wastewater treatment (from biofilm culturing, wastewater adsorption, biochemical reaction, regeneration of ammonia nitrogen adsorption filler to the treatment of discharged wastewater and wastewater entering the next period), the aeration biological device adopts a heating device to heat and keep the temperature at a middle temperature all the time.
Comparative example 2 Single adsorption apparatus
A method for removing ammonia nitrogen in low-temperature wastewater comprises the following steps:
(1) to an adsorption unit (an aeration filter column filled with zeolite filler, the filler occupying the volume of the filter column)1/2-2/3), continuously feeding water with the ammonia nitrogen concentration of 30mg/L and adding alkalinity (as CaCO)3Metering) 240mg/L, the concentration of dissolved oxygen is 2-8 mg/L, the temperature is 20-35 ℃, and when half of ammonia nitrogen in inlet water is converted into nitrite nitrogen and nitrate nitrogen, the biofilm culturing is completed;
(2) introducing low-temperature ammonia nitrogen wastewater (the ammonia nitrogen concentration is 30mg/L, the temperature is respectively 8 ℃ and 10 ℃) into an adsorption device filled with zeolite, adsorbing ammonia nitrogen in the low-temperature ammonia nitrogen wastewater by the zeolite (the adsorption time is 4 hours), gradually increasing the ammonia nitrogen concentration in effluent along with the adsorption, and directly discharging when the ammonia nitrogen concentration in the effluent is less than 5 mg/L; when the concentration of ammonia nitrogen in the effluent is more than or equal to 5mg/L, stopping water inflow, and at the moment, loading ammonia nitrogen wastewater in the adsorption device; dissolving 2-8 mg/L of oxygen in the adsorption process;
(3) heating the adsorption device filled with zeolite in the step (2), and adding the zeolite into the adsorption device filled with zeolite in the step (2) according to the alkalinity/ammonia nitrogen ratio of 8: 1 adding NaHCO with corresponding mass3Then, the liquid above and below the zeolite packing layer is circulated through an external circulating pump and a pipeline, so that the wastewater continuously circulates above and below the ammonia nitrogen adsorption packing of the adsorption device; in the circulating process, 2-8 mg/L of dissolved oxygen is generated, and the temperature of biochemical reaction is 28 ℃;
(4) after the cyclic operation, when the concentration sum of the nitrite nitrogen and the nitrate nitrogen in the wastewater in the adsorption device in the step (3) reaches 150mg/L (in the embodiment, the in-situ regeneration time of the zeolite is 24 hours), discharging the wastewater in the device and performing back washing;
(5) introducing the low-temperature ammonia nitrogen wastewater into the backwashing absorption device in the step (4), and repeating the steps (2) to (4); thus continuously treating the low-temperature ammonia nitrogen wastewater.
The graph of the effect of in-situ regeneration of zeolite when removing ammonia nitrogen from wastewater at different low temperatures in example 2 and comparative example 2 is shown in fig. 4. FIG. 4 is a graph showing the effect of zeolite regeneration in each apparatus when ammonia nitrogen in ammonia nitrogen wastewater at different low temperatures is treated by the apparatus of example 2 and the apparatus of comparative example 2.
As can be seen from FIG. 4, the in situ regeneration efficiency of zeolite at 10 ℃ in the case of the dual-aeration biological filter column connected in series (the aeration biological device of example 2 is connected in series with the adsorption device of zeolite, and when the zeolite is regenerated, the wastewater in the device is circulated) is 3 times higher than that of the single-zeolite aeration biological filter column (the adsorption device of comparative example 2); when the temperature is 8 ℃, the in-situ regeneration efficiency of the zeolite under the condition that the double-aeration biological filter columns are connected in series is 2 times of the regeneration efficiency of a single zeolite aeration biological filter column, and the in-situ regeneration of the zeolite can be promoted by the serial operation of the double-aeration biological filter columns.
Example 3 biological aeration apparatus and adsorption apparatus in series
A method for adsorbing ammonia nitrogen and removing ammonia nitrogen in low-temperature wastewater based on zeolite and enhancing biological regeneration comprises the following steps:
(1) inoculating nitrated sludge (the sludge concentration is 4000-3Measured) 240mg/L, the concentration of dissolved oxygen is 2-8 mg/L, the temperature is 20-35 ℃, and when more than 90% of ammonia nitrogen in inlet water is converted into nitrite nitrogen and nitrate nitrogen, the biofilm culturing is completed;
inoculating nitrified sludge into adsorption device (zeolite aeration biological filter column) filled with zeolite, aeration for 3 days, continuously feeding water, wherein the ammonia nitrogen concentration of the fed water is 30mg/L, and adding alkalinity (as CaCO)3Metering) 240mg/L, the concentration of dissolved oxygen is 2-8 mg/L, the temperature is 20-35 ℃, and when half of ammonia nitrogen in inlet water is converted into nitrite nitrogen and nitrate nitrogen, the biofilm culturing is completed;
(2) introducing low-temperature ammonia nitrogen wastewater (the ammonia nitrogen concentration is 30mg/L, the temperature is respectively 8 ℃ and 10 ℃) into an adsorption device filled with zeolite, adsorbing ammonia nitrogen in the low-temperature ammonia nitrogen wastewater by the zeolite (the adsorption time is 2 hours), gradually increasing the ammonia nitrogen concentration in effluent along with the adsorption, and directly discharging when the ammonia nitrogen concentration in the effluent is less than 5 mg/L; when the concentration of ammonia nitrogen in the effluent is more than or equal to 5mg/L, stopping water inflow, and at the moment, loading ammonia nitrogen wastewater in the adsorption device;
(3) adding the mixture into the adsorption device filled with the zeolite in the step (2) according to the ratio of alkalinity/ammonia nitrogen to 8: 1 adding NaHCO with corresponding mass3Then introducing the ammonia nitrogen wastewater added with alkalinity into the stepBiochemical reaction is carried out at 35 ℃ in the aeration biological device in the step (1), and then the wastewater after biochemical reaction in the aeration biological device enters the adsorption device again, so that the wastewater continuously circulates in the adsorption device and the aeration biological device; in the circulating process, 2-8 mg/L of dissolved oxygen in the wastewater in the adsorption device and the aeration biological device;
(4) after the cyclic operation, when the concentration sum of nitrite nitrogen and nitrate nitrogen in the wastewater in the adsorption device and the biological aeration device in the step (3) reaches 150mg/L, discharging the wastewater in the two devices, performing back flushing on the adsorption device, and performing in-situ regeneration on the zeolite in the next period of low-temperature ammonia nitrogen wastewater treatment in the embodiment by using the back-flushed adsorption device and the biological aeration device for discharging the wastewater for 24 h;
(5) the treatment of the low-temperature ammonia nitrogen wastewater in the next period specifically comprises the steps of introducing the low-temperature ammonia nitrogen wastewater into the backwashing adsorption device in the step (4), and repeating the steps (2) to (4); thus continuously treating the low-temperature ammonia nitrogen wastewater; the aeration biological device in the low-temperature ammonia nitrogen wastewater treatment of the next period is an aeration biological device for discharging wastewater of the previous period. In the whole process of wastewater treatment (from biofilm culturing, wastewater adsorption, biochemical reaction, regeneration of ammonia nitrogen adsorption filler to the treatment of discharged wastewater and wastewater entering the next period), the aeration biological device adopts a heating device to heat and keep the temperature at a middle temperature all the time.
Comparative example 3 Single adsorption apparatus
A method for removing ammonia nitrogen in low-temperature wastewater comprises the following steps:
(1) inoculating nitrified sludge into an adsorption device (an aeration filter column filled with zeolite filler, wherein the filler accounts for 1/2-2/3 of the volume of the filter column), aeration for 3 days, continuously feeding water, wherein the ammonia nitrogen concentration of the fed water is 30mg/L, and adding alkalinity (CaCO)3Metering) 240mg/L, the concentration of dissolved oxygen is 2-8 mg/L, the temperature is 20-35 ℃, and when half of ammonia nitrogen in inlet water is converted into nitrite nitrogen and nitrate nitrogen, the biofilm culturing is completed;
(2) introducing low-temperature ammonia nitrogen wastewater (the ammonia nitrogen concentration is 30mg/L, the temperature is respectively 8 ℃ and 10 ℃) into an adsorption device filled with zeolite, adsorbing ammonia nitrogen in the low-temperature ammonia nitrogen wastewater by the zeolite (the adsorption time is 2 hours), gradually increasing the ammonia nitrogen concentration in effluent along with the adsorption, and directly discharging when the ammonia nitrogen concentration in the effluent is less than 5 mg/L; when the concentration of ammonia nitrogen in the effluent is more than or equal to 5mg/L, stopping water inflow, and at the moment, loading ammonia nitrogen wastewater in the adsorption device;
(3) heating the adsorption device filled with zeolite in the step (2), and adding the zeolite into the adsorption device filled with zeolite in the step (2) according to the alkalinity/ammonia nitrogen ratio of 8: 1 adding NaHCO with corresponding mass3Then, the liquid above and below the zeolite packing layer is circulated through an external circulating pump and a pipeline, so that the wastewater continuously circulates above and below the ammonia nitrogen adsorption packing of the adsorption device; in the circulating process, 2-8 mg/L of dissolved oxygen is generated, and the temperature of biochemical reaction is 35 ℃;
(4) after the cyclic operation, when the concentration sum of the nitrite nitrogen and the nitrate nitrogen in the wastewater in the adsorption device in the step (3) reaches 150mg/L (in the embodiment, the in-situ regeneration time of the zeolite is 24 hours), discharging the wastewater in the device and performing back washing;
(5) introducing the low-temperature ammonia nitrogen wastewater into the backwashing absorption device in the step (4), and repeating the steps (2) to (4); thus continuously treating the low-temperature ammonia nitrogen wastewater.
The graph of the effect of in-situ regeneration of zeolite when removing ammonia nitrogen from wastewater at different low temperatures in example 3 and comparative example 3 is shown in fig. 5. FIG. 5 is a graph showing the effect of zeolite regeneration in each apparatus when ammonia nitrogen in ammonia nitrogen wastewater at different low temperatures is treated by the apparatus of example 3 and the apparatus of comparative example 3.
As can be seen from FIG. 5, the in-situ zeolite regeneration efficiency at 8 and 10 ℃ in the case of the dual-aeration biofilter column in series (the aeration biological device of example 3 is in series with the adsorption device of zeolite, and during the zeolite regeneration, the wastewater in the device is circulated) is 2 times higher than that of the single-zeolite-aeration biofilter column (the adsorption device of comparative example 3). The shorter the adsorption time, the higher the regeneration efficiency. When the adsorption time is 2h, the regeneration rate of the zeolite can reach 50 percent.
Therefore, the method can promote the in-situ regeneration of the ammonia nitrogen adsorption saturated zeolite, is suitable for treating low-temperature low-concentration ammonia nitrogen-containing wastewater, and has certain engineering significance for solving the problem that the ammonia nitrogen of the sewage treatment plant in northern China cannot reach the standard and is discharged.
Claims (4)
1. A method for removing ammonia nitrogen in low-temperature wastewater based on ammonia nitrogen adsorption and enhanced biological regeneration is characterized by comprising the following steps: the method comprises the following steps:
(1) inoculating nitrified sludge into an aeration biological device filled with fillers, and culturing by hanging a membrane;
(2) introducing the low-temperature ammonia nitrogen wastewater into an adsorption device filled with ammonia nitrogen adsorption filler, adsorbing ammonia nitrogen in the low-temperature ammonia nitrogen wastewater by using the ammonia nitrogen adsorption filler, gradually increasing the concentration of ammonia nitrogen in effluent along with the adsorption, and directly discharging the effluent when the concentration of ammonia nitrogen in the effluent is less than 5 mg/L; when the concentration of ammonia nitrogen in the effluent is more than or equal to 5mg/L, stopping water inflow, and at the moment, loading ammonia nitrogen wastewater in the adsorption device;
(3) adding alkalinity into the adsorption device filled with the ammonia nitrogen wastewater in the step (2), then introducing the ammonia nitrogen wastewater added with the alkalinity into the aeration biological device in the step (1) for medium-temperature aeration biochemical reaction, and then introducing the wastewater subjected to the biochemical reaction in the aeration biological device into the adsorption device, so that the wastewater continuously circulates in the adsorption device and the aeration biological device;
(4) after circulating operation, when the concentration sum of nitrite nitrogen and nitrate nitrogen in the wastewater in the adsorption device and the aeration biological device in the step (3) is more than or equal to 150mg/L, discharging the wastewater in the two devices, and completing the regeneration of the ammonia nitrogen adsorption filler in the adsorption device;
(5) performing low-temperature ammonia nitrogen adsorption wastewater treatment of the next period on the adsorption device which completes the regeneration of the ammonia nitrogen adsorption filler in the step (4) and the aeration biological device which discharges the wastewater;
the treatment of the low-temperature ammonia nitrogen wastewater in the next period specifically comprises the steps of introducing the low-temperature ammonia nitrogen wastewater into the adsorption device for completing the regeneration of the ammonia nitrogen adsorption filler in the step (4), and repeating the steps (2) - (4); thus continuously treating the low-temperature ammonia nitrogen wastewater; the aeration biological device is used for discharging the wastewater in the previous period in the low-temperature ammonia nitrogen wastewater treatment of the next period;
the membrane hanging culture in the step (1) comprises the following specific steps: aerating organisms filled with fillerInoculating nitrified sludge in the device, aerating, continuously feeding water, wherein the ammonia nitrogen concentration of the fed water is 30-60 mg/L, adding alkalinity, aerating for biochemical reaction, and completing biofilm culturing when more than half of ammonia nitrogen in the fed water is converted into nitrite nitrogen and nitrate nitrogen; alkalinity, as CaCO3Measured to be 7-8 times of the ammonia nitrogen concentration; during biochemical reaction, the concentration of dissolved oxygen is 2-8 mg/L, and the temperature is 20-35 ℃;
in the whole process of wastewater treatment, the aeration biological device is always in a medium-temperature condition through a heating device, and the medium-temperature is 20-35 ℃; the wastewater treatment comprises ammonia nitrogen adsorption, biochemical reaction and regeneration of ammonia nitrogen adsorption filler in the wastewater;
the adsorption device provided with the ammonia nitrogen adsorption filler in the step (2) needs to be subjected to biofilm culturing before the low-temperature ammonia nitrogen wastewater is introduced; when the biofilm culturing is carried out, the specific steps of the biofilm culturing are as follows: inoculating nitrified sludge into an adsorption device filled with ammonia nitrogen adsorption filler, aerating, continuously feeding water, adding alkalinity, aerating to carry out biochemical reaction, and completing biofilm culturing when more than half of ammonia nitrogen in the fed water is converted into nitrite nitrogen and nitrate nitrogen; alkalinity, as CaCO3Measured to be 7-8 times of the ammonia nitrogen concentration; during biochemical reaction, the concentration of dissolved oxygen is 2-8 mg/L, and the temperature is 20-35 ℃;
the ammonia nitrogen concentration in the low-temperature ammonia nitrogen wastewater in the step (2) is 5-60 mg/L; the temperature of the low-temperature ammonia nitrogen wastewater is less than or equal to 16 ℃;
the conditions for carrying out the moderate temperature biochemical reaction in the aeration biological device in the step (3) are as follows: the temperature is 20-35 ℃, and the concentration of dissolved oxygen is 2-8 mg/L;
the adding amount of the alkalinity in the step (3) meets the following requirements: the mass ratio of the alkalinity to the ammonia nitrogen is (8-12): 1.
2. the method for removing ammonia nitrogen in low-temperature wastewater based on ammonia nitrogen adsorption and enhanced biological regeneration as claimed in claim 1, is characterized in that: the number of the adsorption devices in the step (2) is more than or equal to 1, and the number is an integer; when a plurality of adsorption devices are arranged, the aeration biological device and one adsorption device complete the regeneration of the ammonia nitrogen adsorption filler, and the aeration biological device and the other adsorption device perform the regeneration of the ammonia nitrogen adsorption filler; the regeneration of the ammonia nitrogen adsorption filler refers to the regeneration of the ammonia nitrogen adsorption filler realized by operating according to the steps (3) and (4); when a plurality of adsorption devices are arranged, the ammonia nitrogen adsorption filler regeneration is alternately carried out by the adsorption devices;
the plurality of adsorption devices are adsorption devices which respectively perform adsorption according to the step (2) and stop water inflow.
3. The method for removing ammonia nitrogen in low-temperature wastewater based on ammonia nitrogen adsorption and enhanced biological regeneration as claimed in claim 1, is characterized in that: and (3) the temperature of the low-temperature ammonia nitrogen wastewater in the step (2) is 5-16 ℃.
4. The method for removing ammonia nitrogen in low-temperature wastewater based on ammonia nitrogen adsorption and enhanced biological regeneration as claimed in claim 1, is characterized in that: and (4) when the wastewater in the step (3) is circulated to an adsorption device filled with the ammonia nitrogen adsorption filler, treating the wastewater under the condition that the dissolved oxygen concentration is 2-8 mg/L.
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| CN1544361A (en) * | 2003-11-14 | 2004-11-10 | 大连理工大学 | Sewage processing device and method by active carbon concentration and separation and biological regeneration |
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| KR100869059B1 (en) * | 2008-03-28 | 2008-11-17 | (주)대성그린테크 | Treatment pocess using the by-product of zeolite regeneration for the industrial wastewater loaded high nitrogen |
| CN104386816A (en) * | 2009-07-08 | 2015-03-04 | 沙特阿拉伯石油公司 | Low concentration wastewater treatment system and process |
| US8992776B2 (en) * | 2009-08-11 | 2015-03-31 | Kinder Morgan Operating L.P.“C” | Methods for treating waste water |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1544361A (en) * | 2003-11-14 | 2004-11-10 | 大连理工大学 | Sewage processing device and method by active carbon concentration and separation and biological regeneration |
| CN1686872A (en) * | 2005-03-28 | 2005-10-26 | 哈尔滨工业大学 | Method for removing ammonia nitrogen from sewage in subzone |
| KR100869059B1 (en) * | 2008-03-28 | 2008-11-17 | (주)대성그린테크 | Treatment pocess using the by-product of zeolite regeneration for the industrial wastewater loaded high nitrogen |
| CN104386816A (en) * | 2009-07-08 | 2015-03-04 | 沙特阿拉伯石油公司 | Low concentration wastewater treatment system and process |
| US8992776B2 (en) * | 2009-08-11 | 2015-03-31 | Kinder Morgan Operating L.P.“C” | Methods for treating waste water |
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