CN109264850B - Integrated anaerobic ammonia oxidation membrane bioelectrochemical system and sewage denitrification and decarbonization treatment process - Google Patents
Integrated anaerobic ammonia oxidation membrane bioelectrochemical system and sewage denitrification and decarbonization treatment process Download PDFInfo
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- 239000012528 membrane Substances 0.000 title claims abstract description 104
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000010865 sewage Substances 0.000 title claims abstract description 55
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 38
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 38
- 230000003647 oxidation Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000011282 treatment Methods 0.000 title claims abstract description 22
- 238000005262 decarbonization Methods 0.000 title claims abstract description 8
- 239000010405 anode material Substances 0.000 claims abstract description 24
- 239000010406 cathode material Substances 0.000 claims abstract description 23
- 238000005273 aeration Methods 0.000 claims abstract description 20
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000005341 cation exchange Methods 0.000 claims abstract description 9
- 239000003011 anion exchange membrane Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 96
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 27
- 241000894006 Bacteria Species 0.000 claims description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims description 26
- 241001453382 Nitrosomonadales Species 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 230000005684 electric field Effects 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000010802 sludge Substances 0.000 claims description 6
- 241001148471 unidentified anaerobic bacterium Species 0.000 claims description 5
- 239000002351 wastewater Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 13
- 238000005374 membrane filtration Methods 0.000 abstract description 8
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 abstract description 6
- 244000005700 microbiome Species 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 210000004027 cell Anatomy 0.000 description 5
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 4
- 238000012851 eutrophication Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000012271 agricultural production Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000009935 nitrosation Effects 0.000 description 1
- 238000007034 nitrosation reaction Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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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
- C02F3/005—Combined electrochemical biological processes
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- Chemical & Material Sciences (AREA)
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- Engineering & Computer Science (AREA)
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Abstract
The invention provides an integrated anaerobic ammonia oxidation membrane bioelectrochemical system and a sewage denitrification and decarbonization treatment process, wherein the integrated anaerobic ammonia oxidation membrane bioelectrochemical system comprises an anode chamber, a cathode chamber and a membrane biological pond, a cation exchange membrane is arranged between the membrane biological pond and the anode chamber, an anion exchange membrane is arranged between the membrane biological pond and the cathode chamber, an anode material is arranged in the anode chamber, a cathode material and an aeration device are arranged in the cathode chamber, and the cathode material and the anode material are connected through an external circuit provided with a rheostat with an adjustable resistance value. The invention efficiently couples the microorganism electricity generation technology, the membrane filtration technology and the anaerobic ammonia oxidation technology according to NH in sewage 4 + The ratio of ammonia nitrogen to nitrite nitrogen in the anaerobic ammonia oxidation process can be accurately controlled by adjusting the resistance value of the rheostat, the operation is simple, the control is convenient, the sewage treatment efficiency is high, and the method has wide application prospect.
Description
Technical Field
The invention relates to a sewage biological treatment technology, in particular to an integrated anaerobic ammonia oxidation membrane bioelectrochemical system for sewage denitrification and decarbonization and a sewage denitrification and decarbonization treatment process.
Background
With the continuous increase of population numbers in China and the rapid development of industrial and agricultural production, the discharge of human production and domestic sewage is increasingly increased, a large amount of environmental pollutants are discharged into water bodies, the environment of the receiving water bodies is accelerated to deteriorate, in recent years, the eutrophication of the environment of the water bodies in China presents a trend of accelerated deterioration, the eutrophication of surface water bodies becomes one of the core problems of water pollution in China, and the discharge of a large amount of nitrogen-containing sewage is an important cause for the eutrophication of the receiving water, so how to realize sewage denitrification with high efficiency and low energy is a problem which is generally required to be solved by sewage treatment plants in China.
At present, the sewage denitrification technology commonly applied in sewage plants is a traditional nitrification-denitrification technology, however, the traditional denitrification technology has obvious defects: the denitrification requires an external organic carbon source; a large amount of aeration is needed for nitrification, so that the running cost is increased; the process flow is long, the operation is complex, the occupied area is large, and the capital construction cost is high; a great deal of acidity is generated in the reaction process, alkali is needed to be added for neutralization, and the cost is increased and secondary pollution is caused; the nitrifying liquid reflux increases power consumption, etc., and therefore, development of an economical and efficient sewage denitrification treatment technology is urgently needed.
Anaerobic ammoxidation refers to a novel and efficient autotrophic nitrogen removal process in which anaerobic ammonia oxidizing bacteria oxidize ammonia nitrogen into nitrogen by utilizing nitrite in an anaerobic environment. Compared with the traditional nitrification-denitrification process, the anaerobic ammonia oxidation process can save oxygen supply energy consumption, has small occupied area, does not need additional organic carbon sources and neutralizing agents, has high denitrification efficiency and low sludge yield, and has no secondary pollution to the environment. Through the development of over twenty years, the anaerobic ammonia oxidation technology is mature, is considered as the most sustainable sewage denitrification technology with economy, high efficiency and good application prospect and commercial value.
Because the anaerobic ammonia oxidizing bacteria have long time and harsh growth conditions, are sensitive to environmental changes, and are difficult to rapidly enrich in the process of starting the process; in the running process, the traditional precipitation method is used for separating mud from water, so that a large amount of anaerobic ammonia oxidizing bacteria are easily lost; the existence of a large amount of organic matters in the sewage can seriously inhibit the activity of anammox bacteria; in order to maximally realize the removal of nitrogen in sewage, the proportion of ammonia nitrogen and nitrite nitrogen in the anaerobic ammonia oxidation reaction process needs to be strictly controlled, but the proportion of ammonia nitrogen and nitrite nitrogen is difficult to realize in actual operation. These are all important factors that severely restrict the realization of wide engineering applications of anaerobic ammonia oxidation processes at present.
Disclosure of Invention
The invention aims to provide an integrated anaerobic ammonia oxidation membrane bioelectrochemical system, which solves the problems that anaerobic ammonia oxidation bacteria are difficult to enrich and easy to run off in the existing anaerobic ammonia oxidation sewage treatment process, ammonia nitrogen and nitrite nitrogen are difficult to realize accurate proportioning, and organic matters have an inhibition effect on the activity of the anaerobic ammonia oxidation bacteria.
The second purpose of the invention is to provide a sewage denitrification and decarbonization treatment process, so as to efficiently carry out denitrification treatment on sewage.
One of the objects of the present invention is achieved by:
an integrated anaerobic ammonia oxidation membrane bioelectrochemical system comprises an anode chamber, a cathode chamber and a membrane biological pond positioned between the anode chamber and the cathode chamber, wherein a cation exchange membrane is arranged between the membrane biological pond and the anode chamber, and an anion exchange membrane is arranged between the membrane biological pond and the cathode chamber;
an anode material is arranged in the anode chamber, and anaerobic bacteria and electrogenesis bacteria are attached to the surface of the anode material; an anode chamber water inlet pipe and an anode chamber water outlet pipe are arranged on the anode chamber;
a cathode material and an aeration device are arranged in the cathode chamber, and a cathode chamber water inlet pipe and a cathode chamber water outlet pipe are arranged on the cathode chamber; nitrosate bacteria are attached to the surface of the cathode material, the cathode material is connected with the anode material through an external circuit, and a rheostat with adjustable resistance value is arranged on the external circuit; the cathode chamber water inlet pipe is connected with the anode chamber water outlet pipe;
anaerobic ammonia oxidation sludge and a membrane component are arranged in the membrane biological pond; a membrane biological pond water inlet pipe is arranged on the membrane biological pond and is connected with the cathode chamber water outlet pipe; and a membrane module water outlet pipe is arranged on the membrane module.
The anode chamber water inlet pipe is arranged at the upper part of the side wall of the anode chamber, and the anode chamber water outlet pipe is arranged at the bottom of the anode chamber.
The cathode chamber water inlet pipe is arranged at the bottom of the cathode chamber, and the cathode chamber water outlet pipe is arranged at the top of the cathode chamber.
The aeration device is arranged at the bottom of the cathode chamber and connected with the air pump, and is used for aerating the cathode chamber to keep the dissolved oxygen concentration in the cathode chamber at 0-1.0 mg/L in a low-oxygen environment. Preferably, the aeration device is slightly spaced from the bottom of the cathode chamber body to better achieve aeration.
The membrane biological pond water inlet pipe is arranged at the top of the membrane biological pond.
And a stirrer is arranged in the membrane biological pond and penetrates through the membrane component and is used for uniformly mixing liquid from the anode chamber and the cathode chamber.
The second object of the invention is realized in that:
a sewage denitrification and decarbonization treatment process comprises the following steps:
(a) Setting the integrated anaerobic ammonia oxidation film bioelectrochemical system;
(b) Determination of NH in wastewater 4 + The concentration is used for adjusting the resistance value of the rheostat;
(c) The sewage containing organic matters and ammonia nitrogen enters the anode chamber, anaerobic bacteria and electrogenesis bacteria attached to the surface of the anode material degrade the organic matters in the sewage, and meanwhile, the electrogenesis bacteria also generate electrons, so that an internal electric field is formed between the anode material and the cathode material, and NH in the anode chamber 4 + The water enters the membrane biological pond through the cation exchange membrane under the action of an internal electric field;
(d) Delivering the sewage treated by the anode chamber into the cathode chamber for aeration, and remaining NH in the sewage 4 + -N generates NO under the action of nitrosations attached to the cathode material 2 - -N；
(e) Delivering the sewage treated by the cathode chamber to the membrane biological tank, wherein NH in the membrane biological tank 4 + -N and NO 2 - And (3) generating nitrogen under the action of anaerobic ammonia oxidizing bacteria, performing denitrification treatment, and filtering and discharging water after denitrification treatment through the membrane component.
In step (b), the resistance of the varistor is adjusted to enable NH to enter the membrane biological pond 4 + -N and NO 2 - The molar ratio of the N is 1:1-1.32; preferably, the regulating stationThe resistance of the rheostat enables NH entering the membrane biological pond 4 + -N and NO 2 - The molar ratio of N is 1:1.32.
In the step (d), the aeration amount of the aeration device is controlled by adjusting the power of the air pump, so that the concentration of dissolved oxygen in the cathode chamber is 0-1.0 mg/L.
The invention effectively couples the microorganism electricity generation technology, the membrane filtration technology and the anaerobic ammonia oxidation technology, so that the degradation organic matters, the shortcut nitrification and the anaerobic ammonia oxidation are effectively separated and sequentially acted, the high-efficiency removal of the organic matters and the total nitrogen is realized, and the problem that the organic matters have an inhibition effect on the activity of anaerobic ammonia oxidation bacteria is solved.
According to the invention, the external circuit connected with the cathode chamber and the anode chamber is arranged in the integrated anaerobic ammonia oxidation membrane bioelectrochemical system, the resistance value of a rheostat of the external circuit is adjustable, and the membrane component is arranged in the membrane reaction tank, so that the proportion of ammonia nitrogen and nitrite nitrogen in the anaerobic ammonia oxidation process can be accurately controlled, and the problem that the accurate proportion of ammonia nitrogen and nitrite nitrogen in the anaerobic ammonia oxidation process is difficult to realize is solved; the anode chamber electrogenesis bacteria can degrade organic matters and generate electric energy at the same time, so that an internal electric field is generated between anode materials and cathode materials, the electric stimulation effect is realized on microorganisms, the enrichment of anaerobic ammonia oxidation bacteria can be effectively promoted, the activity of the ammonia oxidation bacteria is improved, the occurrence of membrane pollution is effectively inhibited, the influence of oxygen mixed into a system in the frequent replacement process of a membrane assembly on the living environment of the anaerobic ammonia oxidation bacteria is reduced; the interception effect of the membrane component can effectively avoid the loss of anaerobic ammonia oxidation bacteria, so that the anaerobic ammonia oxidation bacteria always maintain a high concentration state.
The invention has simple operation, convenient control, high sewage treatment efficiency, stable sewage treatment efficiency and good water outlet quality, provides an effective way for efficiently removing organic matters and total nitrogen in sewage, and has wide application prospect.
Drawings
FIG. 1 is a schematic perspective view of the structure of an integrated anaerobic ammonia oxidation membrane bioelectrochemical system.
Fig. 2 is a schematic cross-sectional view of the structure of fig. 1.
In the figure: 1. an anode chamber; 2. an anode chamber water inlet pipe; 3. an anode chamber water outlet pipe; 4. an anode material; 5. A cation exchange membrane; 6. a membrane biological pond; 7. a membrane module; 8. a membrane module water outlet pipe; 9. an anion exchange membrane; 10. a cathode chamber; 11. a cathode chamber inlet pipe; 12. a cathode chamber outlet pipe; 13. a cathode material; 14. an aeration device; 15. an air pump; 16. a wire; 17. a varistor; 18. a water pump; 19. a stirrer; 20. a water inlet pipe of a membrane biological pond.
Detailed Description
The invention is further illustrated by the following examples, which are given by way of illustration only and are not intended to limit the scope of the invention in any way.
The processes and methods not described in detail in the following examples are conventional methods well known in the art, and the following examples all accomplish the objects of the present invention.
As shown in fig. 1-2, the integrated anaerobic ammonia oxidation membrane bioelectrochemical system mainly comprises an anode chamber 1, a cathode chamber 10 and a membrane biological cell 6 which are arranged side by side and in parallel, wherein the membrane biological cell 6 is positioned between the anode chamber 1 and the cathode chamber 10, a cation exchange membrane 5 is arranged between the membrane biological cell 6 and the anode chamber 1, and an anion exchange membrane 9 is arranged between the membrane biological cell 6 and the cathode chamber 10.
The anode chamber 1 mainly plays a role in degrading organic matters in sewage, an anode material 4 is arranged in the anode chamber 1, an anode chamber water inlet pipe 2 is arranged at the upper part of the side wall of the anode chamber 1, and an anode chamber water outlet pipe 3 is arranged at the bottom of the anode chamber 1. Ordinary anaerobes and electrogenerated bacteria are attached to the surface of the anode material 4 to degrade most of organic matters in the sewage, and meanwhile, the electrogenerated bacteria can also generate electrons and transfer the electrons to the anode material.
The short-cut nitrification reaction is mainly performed in the cathode chamber 10, a cathode material 13 and an aeration device 14 are provided in the cathode chamber 10, a cathode chamber water inlet pipe 11 is provided at the bottom of the cathode chamber 10, and a cathode chamber water outlet pipe 12 is provided at the top of the cathode chamber. The cathode chamber water inlet pipe 11 is connected with the anode chamber water outlet pipe 3 through a water pump 18 and a conduit, wherein the water inlet end of the water pump 18 is connected with the anode chamber water outletThe pipe 3 is connected, and the water outlet end of the water pump 18 is connected with the water inlet pipe 11 of the cathode chamber. Nitrosated bacteria are attached to the surface of the cathode material 13 to adsorb NH in the cathode chamber 10 4 + Conversion of N to NO 2 - -N. The cathode material 13 is connected to the anode material 4 via an external circuit (lead 16) on which a varistor 17 is provided to form an internal electric field between the anode material 4 and the cathode material 13. An aeration device 14 is provided at the bottom of the cathode chamber 10, and is connected to an air pump 18 for aerating the inside of the cathode chamber 10 to maintain a low oxygen environment in the cathode chamber 10. Preferably, the aeration device 14 is located a slight distance from the bottom of the cell body of the cathode chamber 10 to better achieve aeration.
The anode material 4 and the cathode material 13 can be made of existing cathode and anode materials, such as carbon cloth, carbon felt, carbon paper, graphite plate or stainless steel mesh. The resistance of the rheostat 17 can be adjusted to adjust the current in the external circuit and thus the NH entering the membrane biological cell 6 4 + -amount of N.
The anaerobic ammoxidation process is mainly performed in the membrane biological tank 6, and a membrane biological tank water inlet pipe 20 is arranged at the top of the membrane biological tank 6 and is connected with a cathode chamber water outlet pipe 12. Anaerobic ammoxidation sludge is arranged in the membrane biological tank 6, and a stirrer 19 and a membrane component 7 are also arranged in the anaerobic ammoxidation sludge. Under the action of anaerobic ammoxidation sludge and a stirrer 19, NH entering the membrane biological tank 6 4 + -N and NO 2 - And (3) generating nitrogen under the action of anaerobic ammonia oxidizing bacteria, and performing denitrification treatment. The membrane module 7 is cylindrical-like and includes upper and lower annular polypropylene tubes and hollow fiber membrane filaments disposed between the polypropylene tubes. An agitator 19 is provided in the membrane bio-cell through the membrane module to uniformly mix the liquids from the anode chamber 1 and the cathode chamber 10. A vertical membrane module water outlet pipe 8 is provided at the top of the membrane module 7 to discharge the water treated by the membrane module 7. The arrangement of the membrane component 7 can effectively avoid the loss of anaerobic ammonia oxidation bacteria, so that the anaerobic ammonia oxidation bacteria always maintain a high concentration state, and the treated water is filtered to discharge the water.
When the integrated anaerobic ammonia oxidation membrane bioelectrochemical system is adopted for sewage treatment, the integrated anaerobic ammonia oxidation membrane bioelectrochemical system comprises the following componentsThe sewage of organism and ammonia nitrogen enters the anode chamber 1 through the anode chamber water inlet pipe 2, most of organic matters in the sewage are degraded by common anaerobic bacteria and electrogenesis bacteria attached to the surface of the anode material 4, and meanwhile, the electrogenesis bacteria also generate electrons and transfer the electrons to the anode material 4, so that the electrons are transferred to the cathode material 13 through an external circuit to form current, and an internal electric field is formed between the anode material 4 and the cathode material 13. NH in anode chamber 1 4 + N is transported through the cation exchange membrane 5 into the membrane bio-pool 6 under the influence of an electric field. According to NH in the water 4 + The N concentration can accurately adjust the resistance value of the external rheostat 17 so as to change the current and enable NH in raw water 4 + N permeates the cation exchange membrane 5 in the desired ratio into the membrane bio-pool 6. Then, the sewage treated in the anode chamber 1 is conveyed into the cathode chamber 10 through a conduit by the water pump 18, and the aeration rate is controlled to maintain a low-oxygen environment (dissolved oxygen concentration is 0-1.0 mg/L) in the cathode chamber 10, so that the residual NH is maintained 4 + The short-range nitrification of ammonia nitrogen to generate NO is realized under the action of nitrosating bacteria attached on the cathode material 13 by N 2 - -N. After that, the sewage treated in the cathode chamber 10 enters the membrane biological tank 6 through a conduit connected between the cathode chamber water outlet pipe 12 and the membrane biological tank water inlet pipe 20, so that NH in the membrane biological tank 6 4 + -N and NO 2 - N generates nitrogen under the action of anaerobic ammonia oxidizing bacteria to realize denitrification, and finally, the denitrified water is filtered by the membrane assembly 6 and discharged from the water outlet pipe 8 of the membrane assembly.
The following examples are for the treatment of municipal domestic sewage, the quality of which is: COD:450mg/L, NH 4 + -N：32 mg/L。
Example 1
Setting the resistance of the external rheostat to be 5 omega, enabling domestic sewage to enter the anode chamber from the anode chamber water inlet pipe, and after the domestic sewage is treated by the anode chamber, enabling the water quality of the outlet water of the anode chamber to be: COD:85mg/L, NH 4 + -N:19mg/L; the water discharged from the anode chamber enters the cathode chamber under the action of a water pump, and after being treated by the cathode chamber, the water discharged from the cathode chamber has the following quality: COD:46mg/L, NO 2 - -N：17mg/L，NH 4 + -N:1.0mg/L; the effluent of the cathode chamber enters the membrane biological reaction tank through an external pipeline and enters NH of the membrane biological reaction tank 4 + -N and NO 2 - The ratio of N is 1:1.32, NH in the membrane bioreactor 4 + -N and NO 2 - N is effectively removed under the action of anaerobic ammonia oxidizing bacteria, and finally water is discharged through membrane filtration, wherein the water quality of the water discharged through the membrane filtration is as follows: COD:30mg/L, NH 4 + -N：0.5mg/L，NO 2 - -N：1.5mg/L，NO 3 - -N:0.5mg/L, the COD removal rate of the effluent is 93.3%, and the total nitrogen removal rate is 92.2%.
Example 2
Setting the resistance value of the external rheostat to be 2 omega, enabling domestic sewage to enter the anode chamber from the anode chamber water inlet pipe, and after the domestic sewage is treated by the anode chamber, enabling the water quality of the outlet water of the anode chamber to be: COD:80mg/L, NH 4 + -N:17mg/L; the water discharged from the anode chamber enters the cathode chamber under the action of a water pump, and after being treated by the cathode chamber, the water discharged from the cathode chamber has the following quality: COD:44mg/L, NO 2 - -N：15mg/L，NH 4 + -N:2mg/L; the effluent of the cathode chamber enters the membrane biological reaction tank through an external pipeline and enters NH of the membrane biological reaction tank 4 + -N and NO 2 - The ratio of N is 1:1, NH in the membrane bioreactor 4 + -N and NO 2 - N is effectively removed under the action of anaerobic ammonia oxidizing bacteria, and finally water is discharged through membrane filtration, wherein the water quality of the water discharged through the membrane filtration is as follows: COD:27mg/L, NH 4 + -N：4.5mg/L，NO 2 - -N：0.5mg/L，NO 3 - -N:1mg/L, the COD removal rate of the effluent is 94%, and the total nitrogen removal rate is 81.3%.
Example 3
Setting the resistance value of the external rheostat to be 10Ω, enabling domestic sewage to enter the anode chamber from the anode chamber water inlet pipe, and after the domestic sewage is treated by the anode chamber, enabling the water quality of the outlet water of the anode chamber to be: COD:105mg/L, NH 4 + -N:20mg/L; the water discharged from the anode chamber enters the cathode chamber under the action of a water pump, and after being treated by the cathode chamber, the water discharged from the cathode chamber has the following quality: COD:70mg/L, NO 2 - -N：18mg/L，NH 4 + -N:2mg/L; the effluent of the cathode chamber enters the membrane biological reaction tank through an external pipeline and enters NH of the membrane biological reaction tank 4 + -N and NO 2 - The ratio of N is 1:1.5, NH in the membrane bioreactor 4 + -N and NO 2 - N is effectively removed under the action of anaerobic ammonia oxidizing bacteria, and finally water is discharged through membrane filtration, wherein the water quality of the water discharged through the membrane filtration is as follows: COD:55mg/L, NH 4 + -N：1mg/L，NO 2 - -N：3.5mg/L，NO 3 - -N:1mg/L, the COD removal rate of the effluent is 87.8%, and the total nitrogen removal rate is 82.8%.
Comparative example 1
The embodiment of the patent CN108483821A is adopted as a comparative example, the traditional partial nitrosation-anaerobic ammoxidation process is adopted for urban sewage denitrification, the nitrite/ammonia nitrogen ratio is 1-1.4, and the total nitrogen removal rate of the sewage is 75-90%. Although the process can control the nitrite/ammonia nitrogen ratio within the range of 1-1.4, the nitrite/ammonia nitrogen ratio is difficult to effectively and accurately control and maintain at the proper ratio, so that the denitrification effect is poor, and the fluctuation range of the total nitrogen removal rate of sewage is large and unstable.
Claims (3)
1. The sewage denitrification and decarbonization treatment process is characterized by comprising the following steps:
(a) An integrated anaerobic ammonia oxidation film bioelectrochemical system is arranged;
the integrated anaerobic ammonia oxidation membrane bioelectrochemical system comprises an anode chamber, a cathode chamber and a membrane biological pond positioned between the anode chamber and the cathode chamber, wherein a cation exchange membrane is arranged between the membrane biological pond and the anode chamber, and an anion exchange membrane is arranged between the membrane biological pond and the cathode chamber;
an anode material is arranged in the anode chamber, and anaerobic bacteria and electrogenesis bacteria are attached to the surface of the anode material; an anode chamber water inlet pipe and an anode chamber water outlet pipe are arranged on the anode chamber; the anode chamber water inlet pipe is arranged at the upper part of the side wall of the anode chamber, and the anode chamber water outlet pipe is arranged at the bottom of the anode chamber;
a cathode material and an aeration device are arranged in the cathode chamber, and a cathode chamber water inlet pipe and a cathode chamber water outlet pipe are arranged on the cathode chamber; the cathode chamber water inlet pipe is arranged at the bottom of the cathode chamber, and the cathode chamber water outlet pipe is arranged at the top of the cathode chamber; the aeration device is arranged at the bottom of the cathode chamber and connected with the air pump, and is used for aerating the cathode chamber to keep a low-oxygen environment with the dissolved oxygen concentration of 0-1.0 mg/L in the cathode chamber;
nitrosate bacteria are attached to the surface of the cathode material, the cathode material is connected with the anode material through an external circuit, and a rheostat with adjustable resistance value is arranged on the external circuit; the cathode chamber water inlet pipe is connected with the anode chamber water outlet pipe;
anaerobic ammonia oxidation sludge and a membrane component are arranged in the membrane biological pond; a membrane biological pond water inlet pipe is arranged at the top of the membrane biological pond and is connected with the cathode chamber water outlet pipe; a membrane module water outlet pipe is arranged on the membrane module; a stirrer is also arranged in the membrane biological pond and penetrates through the membrane component;
(b) Determination of NH in wastewater 4 + The concentration is used for adjusting the resistance value of the rheostat;
(c) The sewage containing organic matters and ammonia nitrogen enters the anode chamber, anaerobic bacteria and electrogenesis bacteria attached to the surface of the anode material degrade the organic matters in the sewage, and simultaneously the electrogenesis bacteria generate electrons, so that an internal electric field is formed between the anode material and the cathode material, and NH in the anode chamber 4 + The water enters the membrane biological pond through the cation exchange membrane under the action of an internal electric field;
(d) Delivering the sewage treated by the anode chamber into the cathode chamber for aeration, and remaining NH in the sewage 4 + NO is generated under the action of nitrosate attached on the cathode material 2 - ；
(e) Delivering the sewage treated by the cathode chamber to the membrane biological tank, wherein NH in the membrane biological tank 4 + And NO 2 - Nitrogen is generated under the action of anaerobic ammonia oxidizing bacteria, denitrification treatment is carried out, and water after denitrification treatment is discharged after being filtered by the membrane component.
2. The process for denitrification and decarbonizing sewage according to claim 1, wherein in the step (b), the resistance of the varistor is adjusted to allow NH to enter the membrane bio-tank 4 + -N and NO 2 - The molar ratio of the-N is 1:1-1.32.
3. The process for denitrification and decarbonizing sewage according to claim 1, wherein in the step (d), the aeration amount of the aeration device is controlled by adjusting the power of the air pump.
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| CN111573834A (en) * | 2020-05-22 | 2020-08-25 | 盐城工学院 | Reactor based on short-cut denitrification electrode is in coordination with anaerobic ammonia oxidation denitrogenation |
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| CN112520838B (en) * | 2020-12-04 | 2024-08-13 | 北京交通大学 | Wastewater and waste gas combined treatment system for efficient decarburization and nitrogen removal |
| CN113277613B (en) * | 2021-06-09 | 2023-04-25 | 叶訚 | Electrode regulation-based integrated biological autotrophic nitrogen removal system, method and application |
| CN113603209A (en) * | 2021-08-10 | 2021-11-05 | 南京师范大学 | Water treatment device and water treatment method of air cathode bioelectrochemical system auxiliary forward osmosis membrane bioreactor |
| CN116062896B (en) * | 2023-03-17 | 2024-09-24 | 浙江工商大学 | Biological strengthening system for denitrification of landfill leachate |
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