CN112645496B - High ammonia nitrogen wastewater treatment and resource recovery system - Google Patents
High ammonia nitrogen wastewater treatment and resource recovery system Download PDFInfo
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- CN112645496B CN112645496B CN202011616338.1A CN202011616338A CN112645496B CN 112645496 B CN112645496 B CN 112645496B CN 202011616338 A CN202011616338 A CN 202011616338A CN 112645496 B CN112645496 B CN 112645496B
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- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 20
- 238000011084 recovery Methods 0.000 title abstract description 10
- 238000010521 absorption reaction Methods 0.000 claims abstract description 97
- 239000007788 liquid Substances 0.000 claims abstract description 95
- 239000002351 wastewater Substances 0.000 claims abstract description 61
- 239000012528 membrane Substances 0.000 claims abstract description 55
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims abstract description 53
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims abstract description 46
- 235000011130 ammonium sulphate Nutrition 0.000 claims abstract description 46
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000001704 evaporation Methods 0.000 claims abstract description 42
- 230000008020 evaporation Effects 0.000 claims abstract description 38
- 238000004064 recycling Methods 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 18
- 239000003513 alkali Substances 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 16
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 14
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 8
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 8
- 238000009833 condensation Methods 0.000 claims abstract description 8
- 230000005494 condensation Effects 0.000 claims abstract description 8
- 239000013078 crystal Substances 0.000 claims abstract description 8
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 239000012452 mother liquor Substances 0.000 claims description 15
- 230000002209 hydrophobic effect Effects 0.000 claims description 10
- 239000012982 microporous membrane Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 238000004062 sedimentation Methods 0.000 claims description 8
- 239000011344 liquid material Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000001914 filtration Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010979 pH adjustment Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 208000031320 Teratogenesis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/24—Sulfates of ammonium
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a high ammonia nitrogen wastewater treatment and recycling system, which comprises a wastewater pretreatment unit, a membrane absorption tower, an evaporation tower, a separation unit and a condensation unit; the wastewater pretreatment unit is used for pretreating the wastewater and then sending the pretreated wastewater into the membrane absorption tower; the membrane absorption tower is filled with sulfuric acid absorption liquid which is used for absorbing ammonia nitrogen in the wastewater to form ammonium sulfate liquid; the evaporation tower is provided with a gas output pipeline, a liquid output pipeline and an alkali adding pipeline, the gas output pipeline is connected and communicated with the input end of the condensing unit, and the liquid output pipeline is connected and communicated with the input end of the separating unit; the separation unit is used for receiving ammonium sulfate crystals formed by heating ammonium sulfate liquid in the evaporation tower and separating to obtain ammonium sulfate; the condensing unit is used for receiving ammonia formed by adding alkali into the ammonium sulfate liquid by the evaporating tower and condensing to obtain ammonia water; namely, ammonia nitrogen recovery is realized through different forms, and the problem that the ammonia nitrogen is difficult to realize high-efficiency recovery in the prior art is practically solved.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a high ammonia nitrogen wastewater treatment and recycling system.
Background
Along with the rapid development of the economy in China, the modernization and town construction are rapid, and town sewage plants, large-scale farms and various factories are increased. Meanwhile, the production of high ammonia nitrogen wastewater such as sludge anaerobic digestion biogas slurry, livestock wastewater, industrial wastewater and the like is also increasing. The high ammonia nitrogen wastewater is easy to cause eutrophication of water body, is accompanied with odor, and has important influence on the sanitation of water environment and living environment. Therefore, the treatment of the high ammonia nitrogen wastewater is very important.
The conventional sewage treatment method (such as an activated sludge method) cannot effectively treat high ammonia nitrogen wastewater, and ammonia nitrogen resources in the water are converted into nitrogen through nitrification and denitrification to enter the atmosphere so as not to be recovered. The conventional physicochemical denitrification technology such as the break point chlorination method, the stripping method and the like still have a plurality of problems in technical economy for treating the high ammonia nitrogen wastewater. When the content of organic matters in the wastewater is high, the folding point chlorination method can greatly increase the potential hazard of water to biological outburst and teratogenesis. The secondary pollution may be caused by the gas generated by the stripping method, and the ammonia nitrogen removal efficiency is low at low temperature.
Therefore, a technical scheme is urgently needed to solve the problem that ammonia nitrogen is difficult to realize high-efficiency recovery in the prior art.
Disclosure of Invention
The invention aims to provide a high ammonia nitrogen wastewater treatment and recycling system, which aims to solve the problem that the ammonia nitrogen is difficult to realize high-efficiency recycling in the prior art.
In order to solve the technical problems, the invention provides a high ammonia nitrogen wastewater treatment and recycling system, which comprises a wastewater pretreatment unit, a membrane absorption tower, an evaporation tower, a separation unit and a condensation unit; the wastewater pretreatment unit is connected with the input end of the membrane absorption tower and is used for pretreating the wastewater and then sending the pretreated wastewater into the membrane absorption tower; the output end of the membrane absorption tower is connected and communicated with the input end of the evaporation tower, sulfuric acid absorption liquid is loaded in the membrane absorption tower, and the sulfuric acid absorption liquid is used for absorbing ammonia nitrogen in wastewater to form ammonium sulfate liquid; the evaporation tower is provided with a gas output pipeline, a liquid output pipeline and an alkali adding pipeline, the gas output pipeline is connected and communicated with the input end of the condensing unit, the liquid output pipeline is connected and communicated with the input end of the separating unit, a first valve is arranged on the liquid output pipeline, and a second valve is arranged on the alkali adding pipeline; the separation unit is used for receiving ammonium sulfate crystals formed by heating the ammonium sulfate liquid by the evaporation tower and separating to obtain ammonium sulfate; the condensing unit is used for receiving ammonia formed by adding alkali into the ammonium sulfate liquid by the evaporating tower and condensing to obtain ammonia water.
In one embodiment, the high ammonia nitrogen wastewater treatment and recycling system further comprises a heat exchanger, the wastewater pretreatment unit is connected and conducted with the input end of the membrane absorption tower after heat exchange of the heat exchanger, and the gas output pipeline is connected and conducted with the condensing unit after heat exchange of the heat exchanger.
In one embodiment, the membrane absorption towers are multiple, and the multiple membrane absorption towers are sequentially connected in series and conducted.
In one embodiment, the high ammonia nitrogen wastewater treatment and recycling system further comprises a liquid material preheating unit, wherein the liquid material preheating unit comprises a plurality of heat exchangers, and the heat exchangers are respectively connected and communicated with the input ends of the membrane absorption towers; the waste water pretreatment unit is connected and communicated with the input end of the membrane absorption tower after heat exchange by the heat exchanger; and the gas output pipeline is connected and communicated with the condensing unit after heat exchange of a plurality of heat exchangers.
In one embodiment, the wastewater pretreatment unit comprises a sedimentation tank, a filter tank and a pH regulating tank, wherein the output end of the sedimentation tank is connected and communicated with the input end of the filter tank, the output end of the filter tank is connected and communicated with the input end of the pH regulating tank, and the output end of the pH regulating tank is connected and communicated with the input end of the membrane absorption tower.
In one embodiment, the pH adjusting tank is a pipe structure, and the pH adjusting tank is used for adjusting pH in a state that the wastewater flows.
In one embodiment, a hydrophobic microporous membrane is arranged in the membrane absorption tower, and the wastewater and the sulfuric acid absorption liquid are respectively contained at two sides of the hydrophobic microporous membrane.
In one embodiment, the high ammonia nitrogen wastewater treatment and recycling system further comprises an absorption liquid circulation unit, wherein the output end of the membrane absorption tower is connected and communicated with the input end of the absorption liquid circulation unit, the liquid adding end of the absorption liquid circulation unit is connected and communicated with the sulfuric acid absorption liquid accommodating space of the membrane absorption tower, and the output end of the absorption liquid circulation unit is connected and communicated with the evaporation tower; the absorption liquid circulation unit is used for detecting the concentration of ammonium sulfate in the ammonium sulfate liquid; when the concentration of the ammonium sulfate is lower than a preset value, the absorption liquid circulation unit is used for adding the sulfuric acid absorption liquid into the membrane absorption tower; and when the concentration of the ammonium sulfate reaches a preset value, the absorption liquid circulation unit is used for sending the ammonium sulfate liquid to the evaporation tower.
In one embodiment, the separation unit comprises a centrifugal device and a drying device, wherein the input end of the centrifugal device is connected and communicated with the liquid output pipeline, and the output end of the centrifugal device is connected and communicated with the input end of the drying device.
In one embodiment, the separation unit further comprises a mother liquor circulation device, the input end of the mother liquor circulation device is communicated with the inside of the centrifugal device, a third valve is arranged on a passage, connected with the centrifugal device, of the mother liquor circulation device, the output end of the mother liquor circulation device is communicated with the inside of the evaporation tower, and the mother liquor circulation device is used for recycling liquid in the centrifugal device and sending the liquid to the evaporation tower.
The beneficial effects of the invention are as follows:
The separation unit is used for receiving ammonium sulfate crystals formed by heating the ammonium sulfate liquid by the evaporation tower and separating to obtain ammonium sulfate, and the condensation unit is used for receiving ammonia formed by adding alkali into the ammonium sulfate liquid by the evaporation tower and condensing to obtain ammonia water, so that ammonia nitrogen recovery can be realized through different forms, the recovery rate of ammonia nitrogen is greatly improved, and the problem that ammonia nitrogen is difficult to realize high-efficiency recovery in the prior art is practically solved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a first configuration provided by the high ammonia nitrogen wastewater treatment and recycling system of the present invention;
FIG. 2 is a schematic diagram of a second configuration provided by the high ammonia nitrogen wastewater treatment and recycling system of the present invention;
fig. 3 is a partially refined structural schematic diagram of fig. 2.
The reference numerals are as follows:
10. a wastewater pretreatment unit; 11. a sedimentation tank; 12. a filtering tank; 13. a pH adjusting tank;
20. A membrane absorption tower;
30. an evaporation tower; 31. a gas output line; 32. a liquid output line; 33. an alkali adding pipeline;
40. a separation unit; 41. a centrifugal device; 42. a drying device; 43. mother liquor circulating device;
50. a condensing unit;
61. a first valve; 62. a second valve; 63. a third valve; 64. a fourth valve; 65. a fifth valve;
70. an absorption liquid circulation unit;
80. a liquid material preheating unit; 81. a heat exchanger.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides a high ammonia nitrogen wastewater treatment and recycling system, a first embodiment of which is shown in figure 1, comprising a wastewater pretreatment unit 10, a membrane absorption tower 20, an evaporation tower 30, a separation unit 40 and a condensation unit 50; the wastewater pretreatment unit 10 is connected and communicated with the input end of the membrane absorption tower 20, and the wastewater pretreatment unit 10 is used for pretreating wastewater and then sending the pretreated wastewater into the membrane absorption tower 20; the output end of the membrane absorption tower 20 is connected and communicated with the input end of the evaporation tower 30, and sulfuric acid absorption liquid is loaded in the membrane absorption tower 20 and is used for absorbing ammonia nitrogen in wastewater to form ammonium sulfate liquid; the evaporation tower 30 is provided with a gas output pipeline 31, a liquid output pipeline 32 and an alkali adding pipeline 33, the gas output pipeline 31 is connected and communicated with the input end of the condensing unit 50, the liquid output pipeline 32 is connected and communicated with the input end of the separating unit 40, the liquid output pipeline 32 is provided with a first valve 61, and the alkali adding pipeline 33 is provided with a second valve 62; the separation unit 40 is used for receiving ammonium sulfate crystals formed by heating the ammonium sulfate liquid in the evaporation tower 30, and separating to obtain ammonium sulfate; the condensing unit 50 is used for receiving ammonia formed by adding alkali to the ammonium sulfate liquid by the evaporating tower 30 and condensing to obtain ammonia water.
In application, the wastewater pretreatment unit 10 pretreats wastewater, for example, the wastewater pretreatment unit 10 preferably includes a sedimentation tank 11, a filtration tank 12, and a pH adjustment tank 13, the output end of the sedimentation tank 11 is connected to the input end of the filtration tank 12, the output end of the filtration tank 12 is connected to the input end of the pH adjustment tank 13, and the output end of the pH adjustment tank 13 is connected to the input end of the membrane absorption tower 20.
So the wastewater will first enter the sedimentation tank 11 to precipitate and realize the precipitation of impurities, then after the wastewater is filtered by the filter tank 12, the secondary elimination of the impurities in the wastewater is realized, the SS value (Suspended Substance, i.e. suspended matters in the water quality) is greatly reduced, and finally the wastewater is adjusted to a proper pH value by the pH adjusting tank 13, for example, alkali is added to enable the pH value of the wastewater to reach 11.0, so that NH 4 + in the wastewater is converted into volatile NH 3, and the pH adjusting tank 13 is preferably provided with a pipeline structure, and the pH adjusting tank 13 is used for adjusting the pH under the flowing state of the wastewater, so that the alkali-added wastewater is rapidly conveyed to the membrane absorption tower 20 to reduce the volatilization of ammonia.
In this embodiment, a hydrophobic microporous membrane is disposed in the membrane absorption tower 20, and the wastewater and the sulfuric acid absorption liquid are respectively contained on two sides of the hydrophobic microporous membrane, so that the ammonia nitrogen wastewater and the sulfuric acid absorption liquid are separated on two sides of the membrane by the hydrophobic microporous membrane, most of NH 4 + in the wastewater is converted into NH 3 by adding alkali for adjustment, NH 3 in the wastewater is vaporized and volatilized into gaseous NH 3 at the interface of the wastewater and the hydrophobic microporous membrane under the pushing of the concentration difference on the two sides of the membrane, and is diffused to the other side of the membrane along the micropores of the hydrophobic microporous membrane, and the ammonium sulfate liquid (NH 4)2SO4) is generated by the reaction on the interface of the sulfuric acid absorption liquid and the hydrophobic microporous membrane.
The high ammonia nitrogen wastewater treatment and recycling system of the embodiment further comprises an absorption liquid circulation unit 70, wherein the output end of the membrane absorption tower 20 is connected and communicated with the input end of the absorption liquid circulation unit 70, the liquid adding end of the absorption liquid circulation unit 70 is connected and communicated with the sulfuric acid absorption liquid accommodating space of the membrane absorption tower 20, and the output end of the absorption liquid circulation unit 70 is connected and communicated with the evaporation tower 30; the absorption liquid circulation unit 70 is used for detecting the concentration of ammonium sulfate in the ammonium sulfate liquid; the absorption liquid circulation unit 70 is used to add sulfuric acid absorption liquid into the membrane absorption tower 20 when the ammonium sulfate concentration is lower than a preset value; the absorption liquid circulation unit 70 is used to send the ammonium sulfate liquid to the evaporation tower 30 when the ammonium sulfate concentration reaches a preset value.
Therefore, the absorption liquid circulation unit 70 measures the pH value and the ammonium sulfate concentration of the sulfuric acid absorption liquid on line, real-time data are fed back to the automatic control system, when the ammonium sulfate concentration is low, the absorption liquid circulation unit 70 is controlled to add sulfuric acid into the absorption liquid, so that the pH value of the sulfuric acid absorption liquid is reduced to an initial value, the sulfuric acid absorption liquid continuously enters the membrane absorption tower 20 for mass transfer, and when the ammonium sulfate concentration reaches a certain value, the relevant valve is controlled to be opened so as to enter an ammonia nitrogen recovery link.
After the ammonium sulfate liquid is sent to the evaporation tower 30, if the ammonium sulfate salt needs to be recovered, the first valve 61 is opened and the second valve 62 is closed, then the evaporation tower 30 heats the ammonium sulfate liquid to realize concentration, so that the ammonium sulfate salt is crystallized and separated out, and the concentrated solid-liquid mixture is subjected to the separation unit 40 to obtain the ammonium sulfate salt.
The separation unit 40 of this embodiment includes a centrifugal device 41 and a drying device 42, where an input end of the centrifugal device 41 is connected to and communicated with the liquid output pipe 32, and an output end of the centrifugal device 41 is connected to and communicated with an input end of the drying device 42.
That is, the centrifugal device 41 can perform solid-liquid separation so as to send ammonium sulfate salt crystals with lower water content to the drying device 42, so that the drying device 42 heats the ammonium sulfate salt crystals to obtain ammonium sulfate salt.
The separation unit 40 of this embodiment further includes a mother liquor circulation device 43, an input end of the mother liquor circulation device 43 is connected and conducted with the inside of the centrifugal device 41, a third valve 63 is disposed on a path of the mother liquor circulation device 43 connected with the centrifugal device 41, an output end of the mother liquor circulation device 43 is connected and conducted with the inside of the evaporation tower 30, and the mother liquor circulation device 43 is used for recovering the liquid in the centrifugal device 41 and delivering the liquid to the evaporation tower 30.
The liquid separated by the centrifugal device 41 is sent again to the evaporation tower 30 so as to be heated and evaporated to obtain ammonium sulfate salt crystals, thereby increasing the concentration of ammonium sulfate in the evaporation tower 30.
If ammonia water recovery is required, the first valve 61 and the third valve 63 are closed, and the second valve 62 is opened to perform an alkali adding operation, such as adding sodium hydroxide, in the evaporation tower 30, so that a large amount of high Wen Anqi is formed in the evaporation tower 30 and sent to the condensing unit 50 for condensation through the gas output pipeline 31, thereby forming ammonia water output.
The high ammonia nitrogen wastewater treatment and recycling system of this embodiment further includes a heat exchanger 81, the wastewater pretreatment unit 10 is connected to the input end of the membrane absorption tower 20 after heat exchange by the heat exchanger 81, and the gas output pipeline 31 is connected to the condensation unit 50 after heat exchange by the heat exchanger 81.
Therefore, the ammonia gas generated by the evaporation tower 30 can send heat to the heat exchanger 81, and the heat exchanger 81 sends the heat to the pretreated wastewater, so that NH 4 + in the wastewater can be accelerated to be converted into NH 3, thereby realizing cooling and condensation of the ammonia gas and preheating of the wastewater, realizing effective utilization of heat energy and reducing energy waste.
In addition, the condensing unit 50 of this embodiment includes a fourth valve 64 and a fifth valve 65, the fourth valve 64 being opened for discharging ammonia water and the fifth valve 65 being opened for discharging for performing a washing operation.
A second embodiment of the high ammonia nitrogen wastewater treatment and recycling system is shown in fig. 2 and 3, which is basically identical to the first embodiment, except that the number of membrane absorption towers 20 is plural, and the plural membrane absorption towers 20 are sequentially connected in series and conducted.
After the plurality of membrane absorption towers 20 are additionally arranged, the treatment of the wastewater can be enhanced, for example, the embodiment is provided with two membrane absorption towers 20, and the high ammonia nitrogen wastewater treatment and recycling system also comprises a liquid material preheating unit 80, wherein the liquid material preheating unit 80 comprises a plurality of heat exchangers 81, and the plurality of heat exchangers 81 are respectively connected and communicated with the input ends of the plurality of membrane absorption towers 20; the waste water pretreatment unit 10 is connected and communicated with the input end of the membrane absorption tower 20 after heat exchange by the heat exchanger 81; the gas output pipeline 31 is connected and communicated with the condensing unit 50 after heat exchange by a plurality of heat exchangers 81.
So the waste water is preheated by heat exchange and then sent into the membrane absorption tower 20, the high efficiency of the reaction is ensured, and the high Wen Anqi generated by the evaporation tower 30 passes through each heat exchanger 81, and the full utilization of the heat energy is also ensured.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (1)
1. A high ammonia nitrogen wastewater treatment and recycling system is characterized in that,
Comprises a wastewater pretreatment unit, a membrane absorption tower, an evaporation tower, a separation unit and a condensation unit;
the wastewater pretreatment unit is connected with the input end of the membrane absorption tower and is used for pretreating the wastewater and then sending the pretreated wastewater into the membrane absorption tower;
the output end of the membrane absorption tower is connected and communicated with the input end of the evaporation tower, sulfuric acid absorption liquid is loaded in the membrane absorption tower, and the sulfuric acid absorption liquid is used for absorbing ammonia nitrogen in wastewater to form ammonium sulfate liquid;
The evaporation tower is provided with a gas output pipeline, a liquid output pipeline and an alkali adding pipeline, the gas output pipeline is connected and communicated with the input end of the condensing unit, the liquid output pipeline is connected and communicated with the input end of the separating unit, a first valve is arranged on the liquid output pipeline, and a second valve is arranged on the alkali adding pipeline;
the separation unit is used for receiving ammonium sulfate crystals formed by heating the ammonium sulfate liquid by the evaporation tower and separating to obtain ammonium sulfate;
The condensing unit is used for receiving ammonia formed by adding alkali into the ammonium sulfate liquid by the evaporating tower and condensing to obtain ammonia water;
the membrane absorption towers are sequentially connected in series and conducted;
The high ammonia nitrogen wastewater treatment and recycling system also comprises a liquid material preheating unit, wherein the liquid material preheating unit comprises a plurality of heat exchangers, and the heat exchangers are respectively connected and communicated with the input ends of the membrane absorption towers;
The waste water pretreatment unit is connected and communicated with the input end of the membrane absorption tower after heat exchange by the heat exchanger;
The gas output pipeline is connected and communicated with the condensing unit after heat exchange by a plurality of heat exchangers;
The wastewater pretreatment unit comprises a sedimentation tank, a filter tank and a pH regulating tank, wherein the output end of the sedimentation tank is connected and communicated with the input end of the filter tank, the output end of the filter tank is connected and communicated with the input end of the pH regulating tank, and the output end of the pH regulating tank is connected and communicated with the input end of the membrane absorption tower;
the pH adjusting tank is of a pipeline structure and is used for adjusting pH in a state that the wastewater flows;
a hydrophobic microporous membrane is arranged in the membrane absorption tower, and the wastewater and the sulfuric acid absorption liquid are respectively contained at two sides of the hydrophobic microporous membrane;
the high ammonia nitrogen wastewater treatment and recycling system further comprises an absorption liquid circulation unit, wherein the output end of the membrane absorption tower is connected and communicated with the input end of the absorption liquid circulation unit, the liquid adding end of the absorption liquid circulation unit is connected and communicated with the sulfuric acid absorption liquid accommodating space of the membrane absorption tower, and the output end of the absorption liquid circulation unit is connected and communicated with the evaporation tower;
The absorption liquid circulation unit is used for detecting the concentration of ammonium sulfate in the ammonium sulfate liquid; when the concentration of the ammonium sulfate is lower than a preset value, the absorption liquid circulation unit is used for adding the sulfuric acid absorption liquid into the membrane absorption tower; when the concentration of the ammonium sulfate reaches a preset value, the absorption liquid circulation unit is used for sending the ammonium sulfate liquid to the evaporation tower;
the separation unit comprises a centrifugal device and a drying device, wherein the input end of the centrifugal device is connected and communicated with the liquid output pipeline, and the output end of the centrifugal device is connected and communicated with the input end of the drying device;
The separation unit further comprises a mother liquor circulation device, the input end of the mother liquor circulation device is communicated with the inside of the centrifugal device, a third valve is arranged on a passage connected with the centrifugal device, the output end of the mother liquor circulation device is communicated with the inside of the evaporation tower, and the mother liquor circulation device is used for recycling liquid in the centrifugal device and sending the liquid to the evaporation tower.
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| CN202011616338.1A CN112645496B (en) | 2020-12-30 | 2020-12-30 | High ammonia nitrogen wastewater treatment and resource recovery system |
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| CN202011616338.1A CN112645496B (en) | 2020-12-30 | 2020-12-30 | High ammonia nitrogen wastewater treatment and resource recovery system |
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| CN115947479B (en) * | 2022-12-21 | 2024-10-22 | 华中农业大学 | Core component and process for recycling ammonia nitrogen in wastewater through air gap type membrane absorption crystallization |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104843816A (en) * | 2014-02-18 | 2015-08-19 | 中国石油化工股份有限公司 | Method for combined production of ammonium sulfate and ammonia water through heat pump flash evaporation, stripping and deamination |
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