CN111547938A - Electrochemical dephosphorization treatment process for wastewater - Google Patents
Electrochemical dephosphorization treatment process for wastewater Download PDFInfo
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- 238000011282 treatment Methods 0.000 title claims abstract description 156
- 239000002351 wastewater Substances 0.000 title claims abstract description 60
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 57
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 57
- 239000011574 phosphorus Substances 0.000 claims abstract description 57
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- 229910052782 aluminium Inorganic materials 0.000 claims description 7
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- 238000000053 physical method Methods 0.000 claims description 7
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- 238000005374 membrane filtration Methods 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/465—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electroflotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention provides an electrochemical dephosphorization treatment process for wastewater, which comprises the following steps: (1) a first-stage treatment process; (2) an anaerobic process; (3) an electrochemical dephosphorization process; (4) aerobic process; (5) a secondary precipitation process; the process may further comprise the steps of: (6) and (3) a three-stage treatment process. The invention provides a novel electrochemical phosphorus removal treatment process, which combines electrochemical phosphorus removal, aerobic treatment and three-stage treatment by adopting a specific treatment sequence, wherein the total phosphorus removal rate of domestic sewage, river water and industrial wastewater can reach more than 99 percent, and the total phosphorus index of treated effluent is less than or equal to 0.2 mg/L. The dephosphorization treatment process can effectively remove the total phosphorus concentration in the wastewater, reduce the sludge production, has low construction cost, effectively saves land area, and has very important significance for saving cost and protecting environment.
Description
Technical Field
The invention belongs to the field of sewage treatment, and particularly relates to an electrochemical dephosphorization treatment process for wastewater.
Background
As the requirement on water environment quality is higher and higher in the current country, the sewage discharge standard of urban sewage treatment plants in part of domestic regions is promoted to the surface water VI type water quality standard, and has the tendency of further promoting to the surface water III type and tightening the total nitrogen discharge, and the tendency of tightening the industrial wastewater discharge standard is increasingly obvious. At present, the treatment technology of industrial wastewater is mainly a biological method with lower operation cost, but the concentration of nitrogen and phosphorus in the wastewater is higher, and the ratio of carbon to nitrogen to phosphorus is easy to unbalance, so that the total phosphorus, ammonia nitrogen or total nitrogen in the water after biological treatment can not reach the relevant discharge standard. The removal of total phosphorus from wastewater typically relies on chemical methods such as chemical flocculation, chemisorption, chemical precipitation, and the like. Phosphorus removal by a chemical method can generally meet most treatment requirements, but the dosage is large, the cost is high, the amount of generated chemical sludge is large, the disposal cost is high, and the risk of secondary pollution exists. Particularly, in a drainage basin with higher requirements on emission standards, the standard reaching difficulty is higher.
Therefore, the development of a sewage treatment process which has low cost, less investment for upgrading and reconstruction, less sludge production and can efficiently and simultaneously remove total phosphorus, COD and ammonia nitrogen in the wastewater is of great significance to the saving of cost and environmental protection.
Disclosure of Invention
The invention aims to provide an electrochemical dephosphorization treatment process capable of simultaneously and efficiently removing total phosphorus, COD (chemical oxygen demand) and ammonia nitrogen in wastewater.
The invention provides an electrochemical dephosphorization treatment process for wastewater, which comprises the following steps:
(1) the primary treatment process comprises the following steps: discharging the wastewater into a primary treatment tank, removing insoluble particulate matters, suspended solids and floating substances in the wastewater by a physical method, and discharging a liquid 1;
(2) an anaerobic process: carrying out anaerobic treatment on the liquid 1 to degrade macromolecular substances into micromolecular substances, and discharging the liquid 2;
(3) the electrochemical dephosphorization process comprises the following steps: allowing the liquid 2 to enter electrochemical water treatment equipment, and discharging the liquid 3 after electrochemical water treatment;
(4) an aerobic process: aerating the liquid 3, then carrying out aerobic treatment, and discharging the liquid 4;
(5) and (3) secondary precipitation process: and discharging the liquid 4 into a secondary sedimentation tank, and discharging the liquid with low phosphorus content after sedimentation.
Further, the process also comprises the following steps:
(6) a three-stage treatment process: and (4) carrying out three-stage treatment on the liquid with low phosphorus content discharged in the step (5).
Further, in the step (1), the physical method is one or two of screening and sedimentation, and the device included in the primary treatment tank is one or more of a coarse grid, a fine grid and a grit chamber.
Further, in the step (2), the anaerobic treatment comprises one or more than two of a hydrolytic acidification process, an anaerobic reaction tank, a facultative reaction tank and a UASB process.
Further, in the step (3), the electrochemical water treatment comprises electrolytic flocculation and electrolytic air flotation; an electrode is arranged in the electrochemical water treatment equipment, and the material of the electrode is any one or more than two of titanium, iron, aluminum or graphite material; the shape of the electrode is plate-shaped or reticular, preferably plate-shaped; the electrode spacing is adjustable between 1 cm and 12cm, and is preferably 6 cm.
Further, in the step (3), a pulse type power supply is adopted during the electrochemical water treatment, and the pulse output peak current is 50-2000A; the average current of pulse output is 5A-1000A; the pulse frequency is 100 HZ-3000 HZ; the pulse duty ratio is 10% -60%; the output waveform is a pulse square wave; the electrochemical water treatment time is more than 5 minutes, preferably 5 to 30 minutes, and more preferably 10 to 15 minutes.
Further, in the step (4), the aeration time is 1 to 5 minutes, preferably 2 minutes.
Further, in the step (4), the aerobic treatment method is an activated sludge method, a biofilm method and/or a biological contact method.
Further, in the step (5), a flocculating agent is added into the secondary sedimentation tank during the sedimentation, and the flocculating agent is preferably polyaluminium chloride or polyacrylamide.
Further, in the step (6), the three-stage treatment method is one or more than two of efficient precipitation, a denitrification filter, membrane filtration, ultraviolet disinfection and ozone disinfection.
When the electrochemical dephosphorization treatment process is used for treating wastewater, a flocculating agent, such as PAC (polyaluminium chloride) or PAM (polyacrylamide), can be added into the secondary sedimentation tank during secondary sedimentation according to the water quality requirement of wastewater effluent.
When the electrochemical dephosphorization treatment process is used for treating wastewater, whether a tertiary treatment process is adopted or not is selected according to the requirement of effluent quality of the wastewater, if the quality of the wastewater treated by the secondary treatment process reaches the wastewater discharge standard executed by a wastewater treatment plant, the tertiary treatment is not required, otherwise, the tertiary treatment is required.
The invention adopts a specific process sequence, combines the electrochemical dephosphorization with the aerobic treatment and the three-stage treatment process, and achieves the following beneficial effects:
1) the phosphorus removal effect is stable, the total phosphorus removal rate in the wastewater can reach more than 99 percent, and the total phosphorus index of effluent is less than or equal to 0.2mg/L after various wastewater is treated by the process;
2) the equipment is simple to operate, the occupied area is small, and no secondary pollution is caused;
3) iron ions generated by the electrolysis of the electrochemical water treatment equipment participate in the electron transfer effect and the enzymatic reaction activator effect, so that the metabolic reaction activity of functional microorganisms can be effectively improved;
4) the high-frequency pulse power supply is adopted for supplying power, so that the treatment efficiency is higher, and the energy consumption is more saved than that of the traditional direct-current power supply;
5) the precipitate obtained after the high-concentration phosphorus-containing wastewater is treated by the electrochemical equipment can be used for recovering phosphorus and enhancing resource utilization.
The electrochemical dephosphorization treatment process for the wastewater provided by the invention adopts a specific treatment sequence, combines the electrochemical dephosphorization and aerobic treatment process with a three-stage treatment process, has the total phosphorus removal rate of more than 99% for domestic sewage, river water and industrial wastewater, and has the total phosphorus index of the treated effluent less than or equal to 0.2 mg/L. The dephosphorization treatment process can effectively reduce the concentration of COD, total phosphorus and ammonia nitrogen in the wastewater, reduce the generation amount of sludge, has low construction cost, effectively saves land area, and has very important significance for saving cost and protecting environment.
In the invention, the three-stage treatment of the sewage is also called deep treatment, and is a process for further removing other impurity components (such as nitrogen, phosphorus, fine suspended matters, trace organic matters, inorganic salts and the like) in the sewage by using a chemical treatment or physical chemical treatment method on the basis of two-stage treatment so as to achieve the standard of wastewater discharge or recycling. Common three-stage treatment processes include high-efficiency precipitation, denitrification filter, membrane filtration, ultraviolet disinfection, ozone disinfection and the like.
Obviously, many modifications, substitutions, and variations are possible in light of the above teachings of the invention, without departing from the basic technical spirit of the invention, as defined by the following claims.
The present invention will be described in further detail with reference to the following examples. This should not be understood as limiting the scope of the above-described subject matter of the present invention to the following examples. All the technologies realized based on the above contents of the present invention belong to the scope of the present invention.
Drawings
FIG. 1 is a flow chart of the wastewater treatment process of the present invention.
Detailed Description
The raw materials and equipment used in the invention are known products and are obtained by purchasing commercial products.
Example 1 wastewater recovery Process according to the invention
The industrial wastewater is treated according to the process flow shown in figure 1. The method comprises the following specific steps:
(1) first-level treatment process (pretreatment section)
Industrial wastewater (wastewater parameters are shown in table 1) enters a sewage treatment plant, is pretreated by adopting a primary treatment process, and removes insoluble particulate matters, suspended solids and floating substances in the wastewater by using a physical method (screening or precipitation). And (5) delivering the effluent to the next working procedure.
(2) Anaerobic process
And (2) delivering the effluent treated in the step (1) into an anaerobic tank or a facultative tank, converting macromolecular organic matters which are difficult to biodegrade into micromolecular organic matters which are easy to biodegrade, improving the biodegradability of the wastewater, and removing part of the organic matters. And (5) delivering the effluent to the next working procedure.
(3) Electrochemical phosphorus removal process
And (3) delivering the effluent treated in the step (2) to an electrochemical treatment section, and performing electrolytic flocculation and electrolytic air flotation by adopting electrochemical water treatment equipment to obtain effluent. After electrochemical treatment, most of phosphorus in the wastewater can be combined into precipitable particles, and part of organic matters are removed.
In the electrochemical water treatment equipment, (1.1) the electrode is a plate-shaped electrode plate, the electrode plate can be replaced according to the requirement, the electrode plate is made of any one of titanium, iron, aluminum or graphite materials, and the aluminum is adopted in the embodiment; (1.2) the distance between the polar plates is 1-12 cm and is adjustable, and the distance is 6cm in the embodiment; (1.3) the equipment adopts a pulse type power supply, and the pulse output peak current is 50-2000A; the average current of pulse output is 5A-1000A; the pulse frequency is 100 HZ-3000 HZ and can be continuously adjusted; the pulse duty ratio is continuously adjustable within the range of 10% -60%; the output waveform is a pulse square wave; and (1.4) after the air floatation function is started, the air floatation device can be used for deslagging. The electrochemical water treatment time is 10-30 minutes.
(4) Aerobic process
Aerating the effluent after the electrochemical treatment in the step (3) for 2min, and then performing aerobic treatment to remove most organic matters and ammonia in the sewageThe aerobic treatment process of the nitrogen and total nitrogen pollutants mainly comprises three major processes of an activated sludge method, a biofilm method and a biological contact method. The aerobic treatment process adopted in the embodiment is an activated sludge method, and the aeration rate of a unit water volume fan during treatment is 2.24m3And/s, the sludge sedimentation ratio is 75-90% in 30 min.
(5) Secondary precipitation
And (4) sending the effluent treated in the step (4) into a secondary sedimentation tank, and discharging liquid after sedimentation.
Through detection, the liquid discharged after secondary precipitation reaches the discharge standard of industrial wastewater.
(6) Three-stage treatment process
And (4) carrying out three-stage treatment on the liquid discharged after the secondary precipitation in the step (5). The common three-stage treatment process comprises efficient precipitation, a denitrification filter, membrane filtration, ultraviolet disinfection and ozone disinfection. The three-stage treatment process adopted in the embodiment is ultraviolet disinfection.
The third-stage sewage treatment is a process for further removing other pollutant components (such as nitrogen, phosphorus, fine suspended matters, trace organic matters, inorganic salts and the like) in the sewage after the second-stage sewage treatment (steps (2) to (5) in the embodiment). And determining whether to adopt a tertiary treatment process to further treat the sewage according to the emission standard executed by the effluent quality of the wastewater, wherein if the quality of the sewage treated by the secondary treatment process reaches the wastewater emission standard executed by a sewage treatment plant, the tertiary treatment is not needed, otherwise, the tertiary treatment is needed.
Example 2 wastewater recovery Process according to the invention
The industrial wastewater is treated according to the process flow shown in figure 1. The method comprises the following specific steps:
(1) first-level treatment process (pretreatment section)
Industrial wastewater (wastewater parameters are shown in table 2) enters a sewage treatment plant, is pretreated by adopting a primary treatment process, and removes insoluble particulate matters, suspended solids and floating substances in the wastewater by using a physical method (screening or precipitation). And (5) delivering the effluent to the next working procedure.
(2) Anaerobic process
And (2) delivering the effluent treated in the step (1) into an anaerobic tank or a facultative tank, converting macromolecular organic matters which are difficult to biodegrade into micromolecular organic matters which are easy to biodegrade, improving the biodegradability of the wastewater, and removing part of the organic matters. And (5) delivering the effluent to the next working procedure.
(3) Electrochemical phosphorus removal process
And (3) delivering the effluent treated in the step (2) to an electrochemical treatment section, and performing electrolytic flocculation and electrolytic air flotation by adopting electrochemical water treatment equipment to obtain effluent. After electrochemical treatment, most of phosphorus in the wastewater can be combined into precipitable particles, and part of organic matters are removed.
In the electrochemical water treatment equipment, (1.1) the electrode is a plate-shaped electrode plate, the electrode plate can be replaced according to the requirement, the electrode plate is made of any one of titanium, iron, aluminum or graphite materials, and the iron is adopted in the embodiment; (1.2) the distance between the polar plates is 1-12 cm and is adjustable, and the distance is 6cm in the embodiment; (1.3) the equipment adopts a pulse type power supply, and the pulse output peak current is 50-2000A; the average current of pulse output is 5A-1000A; the pulse frequency is 100 HZ-3000 HZ and can be continuously adjusted; the pulse duty ratio is continuously adjustable within the range of 10% -60%; the output waveform is a pulse square wave; and (1.4) after the air floatation function is started, the air floatation device can be used for deslagging. The electrochemical water treatment time is 10-30 minutes.
(4) Aerobic process
And (4) aerating the effluent after the electrochemical treatment in the step (3) for 2min, and then performing aerobic treatment to remove most organic matters, ammonia nitrogen and total nitrogen pollutants in the sewage, wherein the aerobic treatment process mainly comprises three major processes of an activated sludge method, a biofilm method and a biological contact method. The aerobic treatment process adopted in the embodiment is an activated sludge method, and the aeration rate of a unit water volume fan during treatment is 2.24m3And/s, the sludge sedimentation ratio is 75-90% in 30 min.
(5) Secondary precipitation
And (4) sending the effluent treated in the step (4) into a secondary sedimentation tank, and discharging liquid after sedimentation.
Through detection, the liquid discharged after secondary precipitation reaches the discharge standard of industrial wastewater.
(6) Three-stage treatment process
And (4) carrying out three-stage treatment on the liquid discharged after the secondary precipitation in the step (5). The common three-stage treatment process comprises efficient precipitation, a denitrification filter, membrane filtration, ultraviolet disinfection and ozone disinfection. The three-stage treatment process adopted in the embodiment is ultraviolet disinfection.
The third-stage sewage treatment is a process for further removing other pollution components (such as nitrogen, phosphorus, fine suspended matters, trace organic matters, inorganic salts and the like) in the sewage after the second-stage sewage treatment. And determining whether to adopt a tertiary treatment process to further treat the sewage according to the emission standard executed by the effluent quality of the wastewater, wherein if the quality of the sewage treated by the secondary treatment process reaches the wastewater emission standard executed by a sewage treatment plant, the tertiary treatment is not needed, otherwise, the tertiary treatment is needed.
Example 3 wastewater recovery Process according to the invention
The industrial wastewater is treated according to the process flow shown in figure 1. The method comprises the following specific steps:
(1) first-level treatment process (pretreatment section)
Industrial wastewater (wastewater parameters are shown in table 3) enters a sewage treatment plant, is pretreated by adopting a primary treatment process, and removes insoluble particulate matters, suspended solids and floating substances in the wastewater by using a physical method (screening or precipitation). And (5) delivering the effluent to the next working procedure.
(2) Anaerobic process
And (2) delivering the effluent treated in the step (1) into an anaerobic tank or a facultative tank, converting macromolecular organic matters which are difficult to biodegrade into micromolecular organic matters which are easy to biodegrade, improving the biodegradability of the wastewater, and removing part of the organic matters. And (5) delivering the effluent to the next working procedure.
(3) Electrochemical phosphorus removal process
And (3) delivering the effluent treated in the step (2) to an electrochemical treatment section, and performing electrolytic flocculation and electrolytic air flotation by adopting electrochemical water treatment equipment to obtain effluent. After electrochemical treatment, most of phosphorus in the wastewater can be combined into precipitable particles, and part of organic matters are removed.
In the electrochemical water treatment equipment, (1.1) the electrode is a plate-shaped electrode plate, the electrode plate can be replaced according to the requirement, the electrode plate is made of any one of titanium, iron, aluminum or graphite materials, and the aluminum is adopted in the embodiment; (1.2) the distance between the polar plates is 1-12 cm and is adjustable, and the distance is 6cm in the embodiment; (1.3) the equipment adopts a pulse type power supply, and the pulse output peak current is 50-2000A; the average current of pulse output is 5A-1000A; the pulse frequency is 100 HZ-3000 HZ and can be continuously adjusted; the pulse duty ratio is continuously adjustable within the range of 10% -60%; the output waveform is a pulse square wave; and (1.4) after the air floatation function is started, the air floatation device can be used for deslagging. The electrochemical water treatment time is 10-30 minutes.
(4) Aerobic process
And (4) aerating the effluent after the electrochemical treatment in the step (3) for 2min, and then performing aerobic treatment to remove most organic matters, ammonia nitrogen and total nitrogen pollutants in the sewage, wherein the aerobic treatment process mainly comprises three major processes of an activated sludge method, a biofilm method and a biological contact method. The aerobic treatment process adopted in the embodiment is an activated sludge method, and the aeration rate of a unit water volume fan during treatment is 2.24m3And/s, the sludge sedimentation ratio is 75-90% in 30 min.
(5) Secondary precipitation
And (4) sending the effluent treated in the step (4) into a secondary sedimentation tank, and discharging liquid after sedimentation.
Through detection, the liquid discharged after secondary precipitation reaches the discharge standard of industrial wastewater.
(6) Three-stage treatment process
And (4) carrying out three-stage treatment on the liquid discharged after the secondary precipitation in the step (5). The common three-stage treatment process comprises efficient precipitation, a denitrification filter, membrane filtration, ultraviolet disinfection and ozone disinfection. The three-stage treatment process adopted in the embodiment is ultraviolet disinfection.
The third-stage sewage treatment is a process for further removing other pollution components (such as nitrogen, phosphorus, fine suspended matters, trace organic matters, inorganic salts and the like) in the sewage after the second-stage sewage treatment. And determining whether to adopt a tertiary treatment process to further treat the sewage according to the emission standard executed by the effluent quality of the wastewater, wherein if the quality of the sewage treated by the secondary treatment process reaches the wastewater emission standard executed by a sewage treatment plant, the tertiary treatment is not needed, otherwise, the tertiary treatment is needed.
The beneficial effects of the process of the invention are demonstrated by the following experimental examples.
Experimental example 1, Effect of treatment Process of the invention example 1 on wastewater quality
The industrial wastewater before treatment, the effluent of the electrochemical phosphorus removal process of step (3) in example 1, and the effluent of the three-stage treatment process of step (6) in example 1 were taken, and the COD, ammonia nitrogen concentration, and total phosphorus concentration in the effluent were measured, and the results are shown in table 1.
TABLE 1 evaluation of the quality of wastewater before and after treatment
As can be seen from Table 1, after the wastewater sequentially passes through the primary treatment process → the anaerobic process → the electrochemical phosphorus removal process (i.e., the steps (1) - (3) of the example 1), the total phosphorus concentration of the effluent is less than 0.2mg/L, and the total phosphorus removal rate is as high as 99.1%.
After the aerobic process → secondary precipitation → tertiary treatment (i.e. the steps (4) - (6) of the embodiment 1), the total phosphorus concentration of the effluent of the embodiment 1 is as low as 0.15mg/L, the COD concentration is as low as 53.9mg/L and the ammonia nitrogen concentration is as low as 2.26 mg/L.
Experimental example 2 and influence of treatment process on wastewater quality in the invention example 2
The wastewater before treatment, the effluent of the electrochemical phosphorus removal process of step (3) in example 2, and the effluent of the three-stage treatment process of step (6) in example 2 were taken, and the COD, ammonia nitrogen concentration, and total phosphorus concentration in the effluent were measured, and the results are shown in table 2.
TABLE 2 evaluation of the quality of wastewater before and after treatment
As can be seen from Table 2, after the wastewater sequentially passes through the primary treatment process → the anaerobic process → the electrochemical phosphorus removal process (i.e., the steps (1) - (3) of the example 2), the total phosphorus concentration of the effluent is less than 0.2mg/L, and the total phosphorus removal rate is as high as 99.3%.
After the aerobic process → secondary precipitation → tertiary treatment (i.e. the steps (4) to (6) of the embodiment 2), the total phosphorus concentration of the effluent of the embodiment 2 is as low as 0.10mg/L, the COD concentration is as low as 49.41mg/L and the ammonia nitrogen concentration is as low as 2.45 mg/L.
Experimental example 3 and the influence of the treatment process on the quality of wastewater in the invention example 3
The wastewater before treatment, the effluent of the electrochemical phosphorus removal process of step (3) in example 3, and the effluent of the three-stage treatment process of step (6) in example 3 were taken, and the COD, ammonia nitrogen concentration, and total phosphorus concentration in the effluent were measured, and the results are shown in table 3.
TABLE 3 evaluation of the quality of wastewater before and after treatment
As can be seen from Table 3, after the wastewater sequentially goes through the primary treatment process → the anaerobic process → the electrochemical phosphorus removal process (i.e., the steps (1) - (3) of example 3), the total phosphorus concentration of the effluent is as low as 0.2mg/L, and the total phosphorus removal rate is as high as 99.5%.
After the aerobic process → secondary precipitation → tertiary treatment (i.e. the steps (4) to (6) of the embodiment 3), the total phosphorus concentration of the effluent of the embodiment 3 is as low as 0.2mg/L, the COD concentration is as low as 49.8mg/L, and the ammonia nitrogen concentration is as low as 2.57 mg/L.
In conclusion, the invention provides a novel electrochemical phosphorus removal treatment process, the specific process sequence of the invention is adopted, the electrochemical phosphorus removal, the aerobic treatment and the three-stage treatment process are combined, the total phosphorus removal rate of the domestic sewage, the river water body and the industrial wastewater is up to more than 99 percent, and the total phosphorus index of the treated effluent is less than or equal to 0.2 mg/L. The dephosphorization treatment process can effectively reduce the concentration of COD, total phosphorus and ammonia nitrogen in the wastewater, reduce the generation amount of sludge, has low construction cost, effectively saves land area, and has very important significance for saving cost and protecting environment.
Claims (10)
1. An electrochemical dephosphorization treatment process of wastewater is characterized in that: the process comprises the following steps:
(1) the primary treatment process comprises the following steps: discharging the wastewater into a primary treatment tank, removing insoluble particulate matters, suspended solids and floating substances in the wastewater by a physical method, and discharging a liquid 1;
(2) an anaerobic process: carrying out anaerobic treatment on the liquid 1 to degrade macromolecular substances into micromolecular substances, and discharging the liquid 2;
(3) the electrochemical dephosphorization process comprises the following steps: allowing the liquid 2 to enter electrochemical water treatment equipment, and discharging the liquid 3 after electrochemical water treatment;
(4) an aerobic process: aerating the liquid 3, then carrying out aerobic treatment, and discharging the liquid 4;
(5) and (3) secondary precipitation process: and discharging the liquid 4 into a secondary sedimentation tank, and discharging the liquid with low phosphorus content after sedimentation.
2. The process of claim 1, wherein: the process further comprises the following steps:
(6) a three-stage treatment process: and (4) carrying out three-stage treatment on the liquid with low phosphorus content discharged in the step (5).
3. The process according to claim 1 or 2, characterized in that: in the step (1), the physical method is one or two of screening and sedimentation, and the device in the primary treatment tank is one or more than two of a coarse grid, a fine grid and a grit chamber.
4. The process according to claim 1 or 2, characterized in that: in the step (2), the anaerobic treatment comprises one or more than two of a hydrolytic acidification process, an anaerobic reaction tank, a facultative reaction tank and a UASB process.
5. The process according to claim 1 or 2, characterized in that: in the step (3), the electrochemical water treatment comprises electrolytic flocculation and electrolytic air flotation; an electrode is arranged in the electrochemical water treatment equipment, and the material of the electrode is any one or more than two of titanium, iron, aluminum or graphite material; the shape of the electrode is plate-shaped or reticular, preferably plate-shaped; the electrode spacing is adjustable between 1 cm and 12cm, and is preferably 6 cm.
6. The process according to claim 1 or 2, characterized in that: in the step (3), a pulse type power supply is adopted during electrochemical water treatment, and the pulse output peak current is 50-2000A; the average current of pulse output is 5A-1000A; the pulse frequency is 100 HZ-3000 HZ; the pulse duty ratio is 10% -60%; the output waveform is a pulse square wave; the electrochemical water treatment time is more than 5 minutes, preferably 5 to 30 minutes, and more preferably 10 to 15 minutes.
7. The process according to claim 1 or 2, characterized in that: in the step (4), the aeration time is 1-5 minutes, preferably 2 minutes.
8. The process according to claim 1 or 2, characterized in that: in the step (4), the aerobic treatment method is an activated sludge method, a biofilm method and/or a biological contact method.
9. The process according to claim 1 or 2, characterized in that: in the step (5), a flocculating agent is added into the secondary sedimentation tank during sedimentation, and the flocculating agent is preferably polyaluminium chloride or polyacrylamide.
10. The treatment process according to any one of claims 2 to 9, characterized in that: in the step (6), the three-stage treatment method is one or more than two of high-efficiency precipitation, a denitrification filter, membrane filtration, ultraviolet disinfection and ozone disinfection.
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