CN111807611A - A2O process-based sewage nitrogen removal method - Google Patents
A2O process-based sewage nitrogen removal method Download PDFInfo
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- CN111807611A CN111807611A CN202010569201.9A CN202010569201A CN111807611A CN 111807611 A CN111807611 A CN 111807611A CN 202010569201 A CN202010569201 A CN 202010569201A CN 111807611 A CN111807611 A CN 111807611A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000010865 sewage Substances 0.000 title claims abstract description 38
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000007599 discharging Methods 0.000 claims abstract description 25
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 23
- 239000002131 composite material Substances 0.000 claims abstract description 16
- 239000010802 sludge Substances 0.000 claims abstract description 14
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 238000004062 sedimentation Methods 0.000 claims abstract description 8
- 241000894006 Bacteria Species 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 238000006396 nitration reaction Methods 0.000 claims abstract description 4
- 230000002572 peristaltic effect Effects 0.000 claims abstract description 4
- 238000000926 separation method Methods 0.000 claims abstract description 4
- 244000005700 microbiome Species 0.000 claims description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims description 10
- 239000011574 phosphorus Substances 0.000 claims description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 238000010992 reflux Methods 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 238000000354 decomposition reaction Methods 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 5
- 238000006864 oxidative decomposition reaction Methods 0.000 claims description 4
- 239000004215 Carbon black (E152) Substances 0.000 claims description 3
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 3
- 238000005276 aerator Methods 0.000 claims description 3
- 150000002191 fatty alcohols Chemical class 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims description 3
- 239000001632 sodium acetate Substances 0.000 claims description 3
- 235000017281 sodium acetate Nutrition 0.000 claims description 3
- JXKPEJDQGNYQSM-UHFFFAOYSA-M sodium propionate Chemical compound [Na+].CCC([O-])=O JXKPEJDQGNYQSM-UHFFFAOYSA-M 0.000 claims description 3
- 239000004324 sodium propionate Substances 0.000 claims description 3
- 229960003212 sodium propionate Drugs 0.000 claims description 3
- 235000010334 sodium propionate Nutrition 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000011259 mixed solution Substances 0.000 abstract 2
- YPJKMVATUPSWOH-UHFFFAOYSA-N nitrooxidanyl Chemical compound [O][N+]([O-])=O YPJKMVATUPSWOH-UHFFFAOYSA-N 0.000 abstract 1
- 230000001965 increasing effect Effects 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 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
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- 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
-
- 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
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
-
- 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
- C02F3/302—Nitrification and denitrification treatment
-
- 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
- C02F3/308—Biological phosphorus removal
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a sewage nitrogen removal method based on an A2O process, which comprises the following steps: removing insoluble impurities in the raw water, and then discharging the raw water into a regulating reservoir to regulate the pH value; then the sewage is discharged into an anoxic tank, denitrifying bacteria in the tank reduce nitrate radical which flows back through internal circulation in the aerobic tank into N2 to be released; then discharging into an anaerobic tank, adding a composite carbon source, stirring, and removing part of BOD; then the mixed solution is discharged into an aerobic tank for nitration reaction, and a part of mixed solution flows back to an anoxic tank; then discharging into a sedimentation tank, discharging after sedimentation separation, and returning the residual sludge to an anoxic tank through a peristaltic pump; then the raw water is discharged after being adsorbed by active carbon. The invention has the advantages that nitrate generated in the aerobic tank can flow back to the anoxic tank, so that the original sewage can obtain sufficient organic matters, the reaction is more sufficient, and the composite carbon source is added in the anaerobic tank, so that the growth rate of denitrifying bacteria is improved, and further the sewage treatment load is improved.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sewage denitrification method based on an A2O process.
Background
At present, both countries and common people pay attention to environmental protection, waste water in 'three wastes' is the key point of attention of people, people cannot leave water, pollutants in water can directly or indirectly damage human beings and natural organisms, and great harm is brought to the environment. Water resources are increasingly in shortage, and sewage treatment discharge reaching standards and reclaimed water recycling are increasingly necessary.
The frequent technique for treating domestic sewage by the domestic sewage treatment equipment comprises the following steps: AO process, A2O process, MBR process, biological aerated filter, and SBR process. The A2O process is an improved version of the AO process, has higher removal rate on nitrogen, COD and organic matters in domestic sewage, and can remove phosphorus while denitrifying, which is a characteristic that the AO process does not have, and has relatively lower technical requirements and lower cost compared with an MBR process, a biological aerated filter and an SBR process.
The A2O process (also called A-A-O process, which is the first letter of Anaerobic-aerobic-Oxic in English and is called biological denitrification and dephosphorization, also called Anaerobic-Anoxic-aerobic method) becomes a wastewater biological treatment process widely used in municipal sewage treatment plants at present due to the function of simultaneous denitrification and dephosphorization. However, the nitrogen removal rate of the A2O sewage nitrogen removal process at the present stage is low, and the sewage needs to be subjected to multiple times of nitrogen removal treatment, so that a plurality of aerobic tanks and anoxic tanks need to be arranged, and the sewage nitrogen removal cost is high.
Disclosure of Invention
The invention aims to provide a sewage denitrification method based on an A2O process, which has the advantages that nitrate generated in an aerobic tank can flow back to an anoxic tank, so that raw sewage can obtain sufficient organic matters, the reaction is more sufficient, a composite carbon source is added into the anaerobic tank, the growth rate of denitrifying bacteria is improved, and the sewage treatment load is further improved, and the problems that the denitrification cost of the sewage denitrification process is high due to the fact that multiple aerobic tanks and anoxic tanks are required to be arranged because the denitrification rate of the A2O sewage denitrification process at the present stage is low and the sewage needs to be subjected to multiple times of denitrification treatment are solved.
In order to achieve the purpose, the invention provides the following technical scheme: a sewage nitrogen removal method based on an A2O process comprises the following steps:
s1, removing impurities and filtering the raw water to remove insoluble impurities in the water, and then discharging the raw water into a regulating reservoir to regulate the pH value;
s2, discharging the raw water obtained in the previous step into an anoxic tank, wherein denitrifying bacteria in the tank use undecomposed carbon-containing organic matters in the sewage as carbon sources, and nitrate radicals which flow back through internal circulation in the aerobic tank are reduced into N2 to be released;
s3, discharging the raw water obtained in the previous step into an anaerobic tank, adding a composite carbon source, stirring to completely mix the composite carbon source with the raw water, performing anaerobic decomposition for a certain time, removing part of BOD, and converting part of nitrogen-containing compounds into N2 through denitrification to release the nitrogen-containing compounds;
s4, discharging the raw water obtained in the previous step into an aerobic tank, carrying out nitration reaction on NH3-N in the water to generate nitrate radicals, refluxing a part of treated mixed liquid into an anoxic tank, carrying out oxidative decomposition on organic matters in the water to supply phosphorus-absorbing microorganisms with energy, absorbing phosphorus from the water by the microorganisms, and enabling the phosphorus to enter cell tissues and to be enriched in the microorganisms;
s5, discharging the residual raw water after the previous step into a sedimentation tank, discharging the residual raw water from the system in a form of phosphorus-rich sludge after sedimentation and separation, and returning the residual sludge to an anoxic tank through a peristaltic pump;
and S6, adsorbing the raw water obtained in the previous step by using activated carbon, and then discharging.
Preferably, the pH of the raw water in S1 is adjusted to 6-9.
Preferably, the anaerobic decomposition time in S3 is 1-2 h.
Preferably, the anoxic tank and the anaerobic tank are both provided with underwater mixers for respectively stirring the raw water, the reflux mixed liquor and the reflux sludge in the anoxic tank and the raw water and the composite carbon source in the anaerobic tank to uniformly mix the raw water, the reflux mixed liquor and the reflux sludge.
Preferably, an aerator is arranged in the aerobic tank to transfer oxygen in the air into the liquid by force.
Preferably, the composite carbon source in S3 comprises C2-C4 hydrocarbon, solid fatty alcohol mixture, sodium acetate, sodium propionate and methanol.
Compared with the prior art, the invention has the beneficial effects that: a large amount of nitrate generated in the aerobic tank flows back to the anoxic tank, so that the raw sewage can obtain sufficient organic matters, the denitrification can be fully performed, the composite carbon source is added into the anaerobic tank, the speed of synthesizing new cell substances is increased, the growth rate of denitrifying bacteria is increased by 50-80%, the sludge discharge is reduced by more than 20%, and the effects of increasing the sewage treatment load and increasing the sewage denitrification efficiency are achieved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides a technical scheme of a sewage nitrogen removal method based on an A2O process, which comprises the following steps: a sewage nitrogen removal method based on an A2O process comprises the following steps:
s1, removing impurities and impurities from the raw water, filtering to remove insoluble impurities in the water, then discharging the raw water into a regulating reservoir to regulate the pH value, and regulating the pH value of the raw water to 6-9 in S1;
s2, discharging the raw water obtained in the previous step into an anoxic tank, wherein denitrifying bacteria in the tank use undecomposed carbon-containing organic matters in the sewage as carbon sources, nitrate radicals which are returned in the aerobic tank through internal circulation are reduced into N2 to be released, and an underwater stirrer is arranged in the anoxic tank and is used for stirring the raw water, the returned mixed liquid and the returned sludge in the anoxic tank to uniformly mix the raw water, the returned mixed liquid and the returned sludge;
s3, discharging the raw water obtained in the previous step into an anaerobic tank, adding a composite carbon source, stirring to completely mix the composite carbon source with the raw water, performing anaerobic decomposition for a certain time to remove part of BOD, converting part of nitrogen-containing compounds into N2 through denitrification, and releasing the N2, wherein the anaerobic decomposition time in S3 is 1-2h, the raw water and the composite carbon source in the anaerobic tank are uniformly mixed by arranging an underwater stirrer in the anaerobic tank, and the composite carbon source in S3 contains C2-C4 hydrocarbon, a solid fatty alcohol mixture, sodium acetate, sodium propionate and methanol;
s4, discharging the raw water obtained in the previous step into an aerobic tank, carrying out nitration reaction on NH3-N in the water to generate nitrate radicals, refluxing a part of treated mixed liquid into an anoxic tank, carrying out oxidative decomposition on organic matters in the water to supply energy to phosphorus-absorbing microorganisms, absorbing phosphorus from the water by the microorganisms, enabling the phosphorus to enter cell tissues and be enriched in the microorganisms, arranging an aerator in the aerobic tank, forcibly transferring oxygen in the air into the liquid, enabling the raw water to obtain sufficient dissolved oxygen, preventing suspended matters in the tank from sinking, enhancing the contact of the organic matters in the tank with the microorganisms and the dissolved oxygen, and ensuring the oxidative decomposition of the organic matters in the sewage by the microorganisms in the tank under the condition of sufficient dissolved oxygen;
s5, discharging the residual raw water after the previous step into a sedimentation tank, discharging the residual raw water from the system in a form of phosphorus-rich sludge after sedimentation and separation, and returning the residual sludge to an anoxic tank through a peristaltic pump;
and S6, adsorbing the raw water obtained in the previous step by using activated carbon, and then discharging.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. A sewage nitrogen removal method based on an A2O process is characterized by comprising the following steps:
s1, removing impurities and filtering the raw water to remove insoluble impurities in the water, and then discharging the raw water into a regulating reservoir to regulate the pH value;
s2, discharging the raw water obtained in the previous step into an anoxic tank, wherein denitrifying bacteria in the tank use undecomposed carbon-containing organic matters in the sewage as carbon sources, and nitrate radicals which flow back through internal circulation in the aerobic tank are reduced into N2 to be released;
s3, discharging the raw water obtained in the previous step into an anaerobic tank, adding a composite carbon source, stirring to completely mix the composite carbon source with the raw water, performing anaerobic decomposition for a certain time, removing part of BOD, and converting part of nitrogen-containing compounds into N2 through denitrification to release the nitrogen-containing compounds;
s4, discharging the raw water obtained in the previous step into an aerobic tank, carrying out nitration reaction on NH3-N in the water to generate nitrate radicals, refluxing a part of treated mixed liquid into an anoxic tank, carrying out oxidative decomposition on organic matters in the water to supply phosphorus-absorbing microorganisms with energy, absorbing phosphorus from the water by the microorganisms, and enabling the phosphorus to enter cell tissues and to be enriched in the microorganisms;
s5, discharging the residual raw water after the previous step into a sedimentation tank, discharging the residual raw water from the system in a form of phosphorus-rich sludge after sedimentation and separation, and returning the residual sludge to an anoxic tank through a peristaltic pump;
and S6, adsorbing the raw water obtained in the previous step by using activated carbon, and then discharging.
2. The method for removing nitrogen from sewage based on A2O process as claimed in claim 1, wherein: s1 adjusting pH of the raw water to 6-9.
3. The method for removing nitrogen from sewage based on A2O process as claimed in claim 1, wherein: the anaerobic decomposition time in S3 is 1-2 h.
4. The method for removing nitrogen from sewage based on A2O process as claimed in claim 1, wherein: and underwater mixers are arranged in the anoxic tank and the anaerobic tank and are used for respectively stirring the raw water, the backflow mixed liquor and the backflow sludge in the anoxic tank and the raw water and the composite carbon source in the anaerobic tank so as to uniformly mix the raw water, the backflow mixed liquor and the backflow sludge.
5. The method for removing nitrogen from sewage based on A2O process as claimed in claim 1, wherein: an aerator is arranged in the aerobic tank to transfer oxygen in the air into the liquid by force.
6. The method for removing nitrogen from sewage based on A2O process as claimed in claim 1, wherein: the composite carbon source in S3 comprises C2-C4 hydrocarbon, solid fatty alcohol mixture, sodium acetate, sodium propionate and methanol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010569201.9A CN111807611A (en) | 2020-06-20 | 2020-06-20 | A2O process-based sewage nitrogen removal method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010569201.9A CN111807611A (en) | 2020-06-20 | 2020-06-20 | A2O process-based sewage nitrogen removal method |
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| CN111807611A true CN111807611A (en) | 2020-10-23 |
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| CN202010569201.9A Pending CN111807611A (en) | 2020-06-20 | 2020-06-20 | A2O process-based sewage nitrogen removal method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716810A (en) * | 2021-09-14 | 2021-11-30 | 杭州职业技术学院 | Dephosphorization and denitrification integrated A2O process |
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| CN113716810A (en) * | 2021-09-14 | 2021-11-30 | 杭州职业技术学院 | Dephosphorization and denitrification integrated A2O process |
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