CN112028379A - Sewage treatment process for effectively denitrifying by utilizing endogenous respiration - Google Patents
Sewage treatment process for effectively denitrifying by utilizing endogenous respiration Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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Abstract
The invention discloses a sewage treatment process for effectively denitrifying by utilizing endogenous respiration, wherein sewage is treated by an anaerobic tank, an anoxic tank, a micro-oxygen zone tank, an aerobic tank and a secondary sedimentation tank in sequence, the sewage enters from the upper end of the anaerobic tank, enters into the micro-oxygen tank from the middle part of the anoxic tank after reacting in the anaerobic tank and the anoxic tank, the micro-oxygen tank is communicated with the bottom of the aerobic tank, the sewage in the micro-oxygen tank enters into the aerobic tank from the bottom after reacting, the sewage in the aerobic tank overflows into the secondary sedimentation tank after temporarily staying, and the sewage is discharged after sedimentation for deep treatment.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a sewage treatment process for effectively denitrifying domestic sewage with low carbon-nitrogen ratio by utilizing endogenous respiration.
Background
The biochemical treatment of sewage is based on the traditional nitrogen and phosphorus removal mechanism. Denitrification process, including nitrification and denitrification; nitrification, i.e. autotrophic nitrifying bacteria (AOB, NOB) under aerobic conditions, NH4+ -N → NO 2-N; denitrification, namely, the denitrifying bacteria take NOX-as an electron acceptor and organic matters as an electron donor under the anoxic condition, NO 3-N → NO 2-N → N2. As can be seen, for denitrification, the core includes three groups of flora, namely nitrifying flora, denitrifying flora and nitrifying flora, which belong to autotrophic bacteria, and the nitrifying flora is strictly aerobic and has a low specific growth rate; most of the denitrifying flora belongs to the heterotrophic bacteria, and the specific growth rate is high. In the typical treatment process of the current sewage plant, an activated sludge method is mostly adopted and arranged according to an A2/O process, namely, an anaerobic section, an anoxic section and an aerobic section, nitrifying liquid is refluxed to the anoxic section at the aerobic tail end to provide nitrate for denitrification, and other processes are mostly deformation processes based on A2/O.
The existing A2/O process has the following inherent disadvantages: 1) the nitrogen and phosphorus removal has a contradiction on sludge age, denitrifying flora and phosphorus accumulating flora need short sludge age, nitrifying flora needs long sludge age, but only single sludge age exists in the system, and the nitrogen and phosphorus removal is realized by adopting an intermediate method; but for nitrifying bacteria, the sludge age is insufficient, the treatment effect in winter is not ideal, and the treatment effect is unstable when the inlet water fluctuates; for denitrifying flora and phosphorus-accumulating flora, the sludge age is too long, the sludge has an aging tendency, and the treatment efficiency is reduced; 2) The nitrogen and phosphorus removal has the difference of dissolved oxygen demand, the phosphorus-accumulating bacteria need absolute anaerobism for anaerobic phosphorus release, the anaerobic phosphorus release process can be influenced or even inhibited by the existence of the dissolved oxygen, and the aerobic stage can excessively absorb phosphorus only when the anaerobic phosphorus release is more sufficient, so that good biological phosphorus removal is realized; the essence of the denitrification process is that denitrifying bacteria take NOx-as an electron acceptor and organic matters as an electron donor, and if molecular dissolved oxygen exists, the molecular dissolved oxygen can be preferentially taken as the electron acceptor, so that the denitrification efficiency is influenced; the nitrifying flora is strictly aerobic, and anaerobic and carbon source existence can be inhibited. 3) The biological denitrification and the denitrification process are actually an opposite integration, which is determined by the self-attributes of nitrifying bacteria and denitrifying bacteria. Nitrifying bacteria are autotrophic microorganisms, organic matters are not needed in the metabolic process, when high-concentration organic matters exist, the competition of the nitrifying bacteria on nutrient substances is far weaker than that of heterotrophic bacteria, the inhibition effect is generated, and the nitrification reaction is limited due to the reduction of the number of the nitrifying bacteria. Therefore, the smaller the BOD5/TKN of the wastewater inlet water, the larger the relative proportion of nitrifying bacteria, and the more favorable the nitrification reaction. The denitrifying bacteria are heterotrophic microorganisms, and an organic carbon source is required to participate in providing reaction electrons during denitrification, so that enough organic carbon source is required for realizing biological denitrification in a real sense. Relevant researches show that when BOD5/TKN in wastewater influent is more than or equal to 4-6 (converted into COD/TKN which is more than or equal to 6-10), the denitrification carbon source is sufficient, while domestic general domestic wastewater influent generally has COD/TKN which is less than or equal to 4, which belongs to serious shortage of carbon source and needs to be added with a large amount of carbon source. 4) The conventional A2/O process can not meet the requirement of reaching the total nitrogen standard frequently under the condition of insufficient carbon source, a large number of sewage treatment plants carry out advanced treatment, denitrification deep bed filter facilities are added for carrying out advanced denitrification, and the construction cost and the operation cost are greatly increased. Therefore, it is important to solve such problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a sewage treatment process for effectively denitrifying by utilizing endogenous respiration, wherein sewage is treated by an anaerobic tank, an anoxic tank, a micro-oxygen zone tank, an aerobic tank and a secondary sedimentation tank in sequence.
In order to realize the technical scheme, the invention provides a sewage treatment process for effectively denitrifying by utilizing endogenous respiration, wherein sewage is sequentially treated by an anaerobic tank, an anoxic tank, a micro-oxygen zone tank, an aerobic tank and a secondary sedimentation tank, the sewage enters from the upper end of the anaerobic tank, enters into the micro-oxygen tank from the middle part of the anoxic tank after reacting in the anaerobic tank and the anoxic tank, the micro-oxygen tank is communicated with the bottom of the aerobic tank, the sewage in the micro-oxygen tank enters into the aerobic tank from the bottom after reacting, the sewage in the aerobic tank enters into the secondary sedimentation tank after temporarily staying, and is discharged for deep treatment after sedimentation.
The further improvement lies in that: the method also comprises two times of backflow, namely sludge backflow and nitrification liquid backflow, wherein the sludge backflow enables settled sludge in the secondary sedimentation tank to flow back to the front end of the anaerobic tank, the nitrification liquid backflow enables 30-50% of mixed liquid in the aerobic tank to flow back to the front end of the anaerobic tank, and 50-70% of mixed liquid in the aerobic tank to flow back to the anoxic tank.
The further improvement lies in that: the sewage stays for 1-1.5h in the anoxic zone, 1-2.5h in the anaerobic zone, 6-8h in the micro-aerobic tank, 6-8h in the aerobic tank and less than or equal to 0.5h in the secondary sedimentation tank.
The further improvement lies in that: the DO of the anaerobic tank is 0-0.2mg/L, the DO of the anoxic tank is 0.2-0.5mg/L, the DO of the micro-aerobic tank is 0.3-0.6mg/L, the DO of the aerobic tank is 1-2mg/L, and the DO of the secondary sedimentation tank is 0.5-1.5 mg/L.
The further improvement lies in that: the temperature of the anaerobic pool, the anoxic pool, the micro-aerobic pool and the aerobic pool is controlled to be 20-30 ℃.
The invention has the beneficial effects that:
1) the method saves energy in operation, saves 50-80% of carbon source adding of the system, and has the core that endogenous respiration is used for denitrification, organic matters are fully utilized, carbon source adding is reduced by more than 50-80%, and sludge production is reduced by 35-75%.
2) The high-efficiency denitrification and dephosphorization is much higher than the traditional process, wherein the TN removal rate is more than 80 percent, and the TP removal rate is more than 90 percent.
3) The dosage of the additive is small, the addition of salt is reduced, and the secondary pollution is reduced.
4) The DO control is lower, and the electricity charge is saved.
5) The process is easy to control, and large-scale replication can be realized.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Fig. 2 is an energy balance diagram of the present invention.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
As shown in fig. 1 and 2, the present embodiment provides a sewage treatment process for performing effective denitrification by utilizing endogenous respiration, wherein sewage is sequentially treated by an anaerobic tank, an anoxic tank, a micro-oxygen zone tank, an aerobic tank and a secondary sedimentation tank, the sewage enters from the upper end of the anaerobic tank, enters from the middle of the anoxic tank after the reaction of the anaerobic tank and the anoxic tank, and is communicated with the bottom of the aerobic tank, enters the aerobic tank from the bottom after the sewage reaction of the micro-oxygen tank, enters the secondary sedimentation tank through overflow after the sewage of the aerobic tank temporarily stays, and the sewage is discharged after sedimentation for deep treatment.
The method also comprises two times of backflow, namely sludge backflow and nitrification liquid backflow, wherein the sludge backflow enables settled sludge in the secondary sedimentation tank to flow back to the front end of the anaerobic tank, the nitrification liquid backflow enables 30-50% of mixed liquid in the aerobic tank to flow back to the front end of the anaerobic tank, and 50-70% of mixed liquid in the aerobic tank to flow back to the anoxic tank.
The sewage stays for 1-1.5h in the anoxic zone, 1-2.5h in the anaerobic zone, 6-8h in the micro-aerobic tank, 6-8h in the aerobic tank and less than or equal to 0.5h in the secondary sedimentation tank. The DO of the anaerobic tank is 0-0.2mg/L, the DO of the anoxic tank is 0.2-0.5mg/L, the DO of the micro-aerobic tank is 0.3-0.6mg/L, the DO of the aerobic tank is 1-2mg/L, and the DO of the secondary sedimentation tank is 0.5-1.5 mg/L. The temperature of the anaerobic pool, the anoxic pool, the micro-aerobic pool and the aerobic pool is controlled to be 20-30 ℃.
The sludge concentration of the micro-aerobic tank is between 4 and 8g/L, and the sludge index is between 70 and 200; the sludge age of the suspended sludge in the system is 10-20d, the sludge load is between 0.3-0.5kgBOD/(kg (MLSS) × d), the pollutants in the water and in the micro-aerobic pool are metabolized by microorganisms, and after adsorption, the COD removal rate reaches more than 80%;
when the inflow rate of sewage is Q, the flow rate of the main water inlet pipe is 80-90% Q, the flow rate of the sludge return pipe is 50-100% Q, and the flow rate of the mixed liquid return pipe is 100-300% Q.
Programmed Cell Death (PCD): cell death is genetically controlled and there is communication between bacterial cells, in some cases a subset of bacteria will actively choose to die to ensure that other bacterial cells survive in adverse environments, and the dead subset of bacterial cells, whose dead cell bodies can be used as substrates by other bacteria to survive. It can be seen that the cost of having a fraction of cells survive in the PCD process is the death of another fraction of cells, while the responsibility of surviving cells is to continue the entire population as survival conditions return to normal.
The reason is that because microscopic nutrition supply inside the biological membrane is insufficient, denitrifying bacteria utilize carbohydrates stored in cells in an anaerobic zone and an anoxic zone, PHB (beta-hydroxybutyrate), programmed cell death cell bodies and other nutrients as electron donors for denitrification, a microenvironment beneficial to endogenous respiration is created through DO control, the PHB in the microorganisms is continuously utilized along with the proceeding of an endogenous respiration process, ammonia nitrogen and nitrate nitrogen in a solution are simultaneously reduced, so that endogenous respiration denitrification is performed under a micro-oxygen condition, the reflux quantity of a mixed solution is reduced, and energy consumption can be saved; in the embodiment, the aerobic tank can enhance nitrification while reducing the sludge production, so that the nitrification can be completely reacted as much as possible, and the integral denitrification efficiency of the system is improved.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides an utilize endogenous breathing to carry out sewage treatment process of effective denitrogenation, sewage is handled through anaerobism pond, oxygen deficiency pond, little oxygen district pond, good oxygen pond and two heavy ponds in proper order, its characterized in that: the sewage enters from the upper end of the anaerobic tank, enters into the micro-aerobic tank from the middle part of the anoxic tank after reacting in the anaerobic tank and the anoxic tank, the micro-aerobic tank is communicated with the bottom of the aerobic tank, the sewage in the micro-aerobic tank enters into the aerobic tank from the bottom after reacting, the sewage in the aerobic tank enters into the secondary sedimentation tank after being temporarily stopped and then is discharged after being precipitated for advanced treatment.
2. The process of claim 1, wherein the wastewater treatment process comprises the following steps: the method also comprises two times of backflow, namely sludge backflow and nitrification liquid backflow, wherein the sludge backflow enables settled sludge in the secondary sedimentation tank to flow back to the front end of the anaerobic tank, the nitrification liquid backflow enables 30-50% of mixed liquid in the aerobic tank to flow back to the front end of the anaerobic tank, and 50-70% of mixed liquid in the aerobic tank to flow back to the anoxic tank.
3. The process of claim 1, wherein the wastewater treatment process comprises the following steps: the sewage stays for 1-1.5h in the anoxic zone, 1-2.5h in the anaerobic zone, 6-8h in the micro-aerobic tank, 6-8h in the aerobic tank and less than or equal to 0.5h in the secondary sedimentation tank.
4. The process of claim 1, wherein the wastewater treatment process comprises the following steps: the DO of the anaerobic tank is 0-0.2mg/L, the DO of the anoxic tank is 0.2-0.5mg/L, the DO of the micro-aerobic tank is 0.3-0.6mg/L, the DO of the aerobic tank is 1-2mg/L, and the DO of the secondary sedimentation tank is 0.5-1.5 mg/L.
5. The process of claim 1, wherein the wastewater treatment process comprises the following steps: the temperature of the anaerobic pool, the anoxic pool, the micro-aerobic pool and the aerobic pool is controlled to be 20-30 ℃.
6. The process of claim 2, wherein the wastewater treatment process comprises the following steps: when the inflow rate of sewage is Q, the flow rate of the main water inlet pipe is 80-90% Q, the flow rate of the sludge return pipe is 50-100% Q, and the flow rate of the mixed liquid return pipe is 100-300% Q.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1607188A (en) * | 2003-10-13 | 2005-04-20 | 张涤非 | ADSEF dephosphorizing-denitrification sewage treatment technique |
| CN102515352A (en) * | 2011-12-20 | 2012-06-27 | 中原工学院 | Method for removing ammonia nitrogen from industrial waste water produced in synthetic ammonia industry |
| CN102718313A (en) * | 2012-04-25 | 2012-10-10 | 国家城市给水排水工程技术研究中心 | AALOO multipoint water feeding synchronization denitrification and dephosphorization process, operation method thereof, and used biological reaction tank |
| CN202924830U (en) * | 2012-04-25 | 2013-05-08 | 国家城市给水排水工程技术研究中心 | Biological reaction tank for AALOO multipoint inlet water simultaneous nitrogen and phosphorus removal technology |
| CN105130092A (en) * | 2015-06-02 | 2015-12-09 | 河海大学 | Treatment device and method for degradation and nitrogen removal of printing and dyeing wastewater high-concentration organic matters |
| CN106186582A (en) * | 2016-08-31 | 2016-12-07 | 南京河海环境研究院有限公司 | The degraded of a kind of brewing wastewater high-enriched organics and the processing means of denitrogenation |
| CN107151054A (en) * | 2017-06-25 | 2017-09-12 | 云南傲远环保科技有限公司 | The aerobic membrane module processing unit of anaerobic/anoxic |
-
2019
- 2019-08-02 CN CN201910712892.0A patent/CN112028379A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1607188A (en) * | 2003-10-13 | 2005-04-20 | 张涤非 | ADSEF dephosphorizing-denitrification sewage treatment technique |
| CN102515352A (en) * | 2011-12-20 | 2012-06-27 | 中原工学院 | Method for removing ammonia nitrogen from industrial waste water produced in synthetic ammonia industry |
| CN102718313A (en) * | 2012-04-25 | 2012-10-10 | 国家城市给水排水工程技术研究中心 | AALOO multipoint water feeding synchronization denitrification and dephosphorization process, operation method thereof, and used biological reaction tank |
| CN202924830U (en) * | 2012-04-25 | 2013-05-08 | 国家城市给水排水工程技术研究中心 | Biological reaction tank for AALOO multipoint inlet water simultaneous nitrogen and phosphorus removal technology |
| CN105130092A (en) * | 2015-06-02 | 2015-12-09 | 河海大学 | Treatment device and method for degradation and nitrogen removal of printing and dyeing wastewater high-concentration organic matters |
| CN106186582A (en) * | 2016-08-31 | 2016-12-07 | 南京河海环境研究院有限公司 | The degraded of a kind of brewing wastewater high-enriched organics and the processing means of denitrogenation |
| CN107151054A (en) * | 2017-06-25 | 2017-09-12 | 云南傲远环保科技有限公司 | The aerobic membrane module processing unit of anaerobic/anoxic |
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Address after: 210019 15 / F, building A4, science and technology innovation complex, 8 Bailongjiang East Street, Jianye District, Nanjing City, Jiangsu Province Applicant after: Jiangsu Zhongpeng Environmental Protection Group Co.,Ltd. Address before: 210019 5th floor, North corridor, building 4a, international R & D headquarters park, 68 Aoti street, Jianye District, Nanjing City, Jiangsu Province Applicant before: Nanjing Zhongpeng Environmental Protection Technology Development Co.,Ltd. |
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Application publication date: 20201204 |