CN115286107A - Device and method for realizing nitrogen and phosphorus removal of town sewage through ferric salt denitrification enhanced short-cut denitrification anaerobic ammonia oxidation process - Google Patents
Device and method for realizing nitrogen and phosphorus removal of town sewage through ferric salt denitrification enhanced short-cut denitrification anaerobic ammonia oxidation process Download PDFInfo
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- CN115286107A CN115286107A CN202211047574.5A CN202211047574A CN115286107A CN 115286107 A CN115286107 A CN 115286107A CN 202211047574 A CN202211047574 A CN 202211047574A CN 115286107 A CN115286107 A CN 115286107A
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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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- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F3/308—Biological phosphorus removal
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention relates to the field of biological sewage treatment, in particular to a device for realizing nitrogen and phosphorus removal of town sewage by a ferric salt denitrification reinforced short-cut denitrification anaerobic ammonia oxidation process, which comprises a domestic sewage raw water tank, a multi-stage A/O (anoxic/oxic) tank, a secondary sedimentation tank and a medicament feeding tank, wherein anaerobic ammonia oxidation fillers are fed into an anoxic zone of the multi-stage A/O tank to realize that anaerobic ammonia oxidation bacteria on the fillers in the anoxic zone perform short-cut denitrification anaerobic ammonia oxidation reaction and nitrogen removal by using nitrate nitrogen generated in an aerobic zone and ammonia nitrogen and carbon sources provided in sectional inlet water; and FeCl is added in an anoxic zone 2 Domesticating iron salt denitrifying bacteria to remove excessive nitrate nitrogen to generate nitrite, thereby being anaerobicThe ammoxidation reaction provides substrate nitrite, further strengthens the ammoxidation effect, improves the contribution rate of anammox denitrification, the anoxic zone Fe (II) is oxidized into Fe (III), the ferric salt is used as a chemical precipitator to strengthen the dephosphorization performance of multi-stage A/O, and the denitrification and dephosphorization of the municipal domestic sewage are synchronously realized.
Description
Technical Field
The invention belongs to the field of biological sewage treatment, and particularly relates to a device and a method for realizing nitrogen and phosphorus removal of urban sewage by a ferric salt denitrification enhanced short-cut denitrification anaerobic ammonia oxidation process.
Background
With the development of social processes, industrialization and urbanization are continuously promoted, and while economy is rapidly developed, a large amount of pollutants generated by human activities cause a large amount of water environment problems, the problems of water resource shortage, ecological destruction, water body pollution and the like are very severe, the problem of water body eutrophication caused by excessive discharge of nitrogen and phosphorus is increasingly prominent, the control of water body eutrophication by sewage denitrification and phosphorus removal and the harmonious water ecological environment have important significance, and the standard requirements of China on sewage discharge of municipal sewage treatment plants are increasingly strict. The sewage treatment plants mostly adopt the conventional sewage treatment technology, the cost of electricity, medicament and the like is high, the sludge treatment problem is severe, and the secondary pollution is easily caused. The research on the new technology for reducing the energy consumption of urban sewage treatment can improve the current water environment problem and reduce the energy consumption of sewage treatment so that the sewage can reach the discharge standard.
The anaerobic ammonia oxidation reaction refers to a process of converting ammonia nitrogen and nitrite into nitrogen by anaerobic ammonia oxidizing bacteria, an organic carbon source is not needed in the reaction, and the application of the technology in urban sewage treatment is a research hotspot in the environmental field. Biological denitrification is considered to be the most economic mode of sewage denitrification, and the anaerobic ammonia oxidation based process provides a scheme with great application prospect for urban sewage denitrification, so that the problems of energy conservation, consumption reduction and standard discharge in the traditional sewage denitrification can be solved. The application of the anaerobic ammonia oxidation process in mainstream urban sewage plants can solve the problems of large aeration energy consumption required in the nitrification process of the sewage plants so as to reduce the power consumption of the sewage plants, and can solve the problems of low C/N ratio and insufficient organic carbon source of the urban sewage so as to reduce the carbon source adding amount of the sewage plants. In addition, the application of the anaerobic ammonia oxidation process in a sewage plant can meet the requirement of effluent quality, reduce the output of excess sludge and reduce the water treatment cost per ton of the water plant compared with the traditional biological denitrification process.
Recently, a new type of iron salt denitrification (NDFO) has been widely reported in ecosystems. NDFO means Fe (II) capable of converting Nitrogen Oxide (NO) x ) Reduction to N 2 And Fe (III) is generated at the same time, so that not only is higher denitrification efficiency achieved, but also the circulation of Fe (III) is realized. Meanwhile, iron ions generated by dissolving iron salt in water can neutralize negative electricity colloidal particles in water, and can react with phosphate to generate iron phosphate precipitate, so that the phosphorus removal efficiency is enhanced, and a new idea is provided for advanced treatment of municipal sewage.
Disclosure of Invention
The invention aims to provide a device and a method for realizing nitrogen and phosphorus removal of urban sewage by a ferric salt denitrification enhanced short-cut denitrification anaerobic ammonia oxidation process, and realize deep nitrogen and phosphorus removal of mainstream urban domestic sewage.
The technical purpose of the invention is realized by the following steps:
a device for realizing nitrogen and phosphorus removal of urban sewage by a ferric salt denitrification enhanced short-cut denitrification anaerobic ammonia oxidation process comprises a domestic sewage raw water tank, a multi-stage A/O (anoxic/oxic) tank, a secondary sedimentation tank and a medicament adding tank; the multistage A/O pool comprises at least three groups of reaction zones, each group of reaction zones comprises an anoxic zone, a front aerobic zone and a rear aerobic zone which are sequentially connected through a pipeline, and the anoxic zone of each group of reaction zones is connected with the rear aerobic zone of the front group of reaction zones through a pipeline; the water outlet of the domestic sewage raw water tank is connected with the anoxic zones of the reaction zones through pipelines, the water outlet of the aerobic zone behind the last reaction zone is connected with a secondary sedimentation tank, the sludge outlet of the secondary sedimentation tank is connected with a return pipe and a sludge discharge pipe, the return pipe is connected to the anoxic zone of the first reaction zone, and the ferrous salt in the medicament adding tank is conveyed to the anoxic zones of the reaction zones through pipelines by a medicament adding pump; the bottom of each front aerobic zone and the bottom of each rear aerobic zone are provided with aeration disks connected with aeration fans, and each anoxic zone is provided with anaerobic ammonia oxidation fillers and a stirrer.
Preferably, an aeration control gate valve and a flow meter are arranged between the aeration disc and the aeration fan.
Preferably, the return pipe is provided with a sludge return gate valve and a sludge return pump.
Preferably, a sludge discharge gate valve is arranged on the sludge discharge pipe.
Preferably, the anaerobic ammonium oxidation filler has a filling ratio of 10-20% in the anoxic zone.
A method for realizing nitrogen and phosphorus removal of town sewage by a ferric salt denitrification enhanced short-cut denitrification anaerobic ammonia oxidation process comprises the following steps:
1) Inoculating the excess sludge of the urban sewage treatment plant, adding the excess sludge into a multistage A/O tank to keep the sludge concentration at 3500-4500mg/L, and adding an anaerobic ammonia oxidation filler inoculated with an anaerobic ammonia oxidation biomembrane to each anoxic zone in the multistage A/O tank, wherein the filling ratio of the anaerobic ammonia oxidation filler is 10-20%;
2) Raw water is respectively pumped into each anoxic zone of a multi-stage A/O tank from a domestic sewage raw water tank through a water inlet pump to perform short-cut denitrification anaerobic ammonia oxidation denitrification, phosphorus-accumulating bacteria perform phosphorus release reaction, sludge from a secondary sedimentation tank flows back to the anoxic zone of a first reaction zone, and the sludge reflux ratio is controlled to be 80-150%; the mixed liquid of the sludge and the raw water flows backwards from the anoxic zone of the first reaction zone, finally enters a secondary sedimentation tank, stays for 3-4 hours in the secondary sedimentation tank, realizes sludge-water separation, and discharges the separated water;
3) Continuously pumping 80-100 g/L of ferrous salt into each anoxic zone of the multistage A/O pool, and controlling the concentration of Fe (II) in each anoxic zone to be kept at 5-10 mg/L all the time;
4) Regulating and controlling the oxygen charging amount of each front and rear aerobic zones, and controlling the dissolved oxygen concentration of the front and rear aerobic zones to be 1 mg/L-2 mg/L;
5) The hydraulic retention time of the multi-stage A/O tank is controlled to be 10-15 h, the discharge of the residual sludge in the secondary sedimentation tank is controlled by a sludge discharge gate valve, and the sludge age of the floc sludge in the reactor is maintained to be 10-15 d.
The invention has the beneficial effects that:
1) The anaerobic ammonium oxidation bacteria can be retained in the filler by coupling the short-range denitrification process with the anaerobic ammonium oxidation process for treating low-concentration urban sewage. Under the synergistic effect of heterotrophic denitrifying bacteria and autotrophic anammox bacteria, the short-cut denitrifying anaerobic ammonia oxidation process can simultaneously remove ammonia nitrogen and nitrate and simultaneously remove organic matters;
2) The aeration quantity and the carbon source adding quantity are saved;
3) Fe (II) is added into an anoxic zone, and a ferric salt denitrification reaction occurs in the anoxic zone, so that on one hand, the growth of anaerobic ammonium oxidation bacteria is promoted, and meanwhile, excessive nitrate nitrogen is removed, and the integral denitrification efficiency of the system is improved;
4) The iron salt is used as a traditional chemical phosphorus removal agent, iron ions generated by dissolving the iron salt in water can neutralize negative electricity colloidal particles in the water, and can also react with phosphate to generate iron phosphate precipitate, so that the phosphorus removal effect of the system is enhanced.
5) The method has the advantages of simple device, flexible operation and strong operability, is suitable for upgrading and reconstructing the established urban sewage treatment plant and is suitable for treating the urban domestic sewage with low carbon-nitrogen ratio.
Drawings
Fig. 1 is a schematic structural diagram of the device provided by the present invention.
Description of reference numerals: 1-domestic sewage raw water tank; 2-a water inlet pump; 3-a first anoxic zone; 4-a first pre-aerobic zone; 5-a first post-aerobic zone; 6-a second anoxic zone; 7-a second pre-aerobic zone; 8-a second post aerobic zone; 9-a third anoxic zone; 10-a third pre-aerobic zone; 11-a third post aerobic zone; 12-a secondary sedimentation tank; 13-water outlet pipe; 14-multi-stage a/O cells; 15-a first water inlet gate valve; 16-a second water inlet gate valve; 17-a third water inlet gate valve; 18-a first blender; 19-a second mixer; 20-a third stirrer; 21-anammox filler; 22-an aeration disc; 23-a flow meter; 24-aeration control gate valve; 25-an aeration fan; 26-a medicament adding box; 27-a dosing pump; 28-a first dosing gate valve; 29-a second dosing gate valve; 30-a third dosing gate valve; 31-sludge reflux pump; 32-sludge return gate valve; 33-mud discharge gate valve.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, but the present invention is not limited to the following examples, so that the objects, solutions and advantages of the present invention can be more clearly understood by those skilled in the art.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer" \ "front end", "rear end", "both ends", "one end", "the other end", etc. indicate orientations or positional relationships based on those shown in the drawings, only for convenience of description and simplification of 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. Unless expressly stated or limited otherwise, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," and 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 a specific case to those of ordinary skill in the art.
As shown in figure 1, the device for realizing nitrogen and phosphorus removal of town sewage by using the ferric salt denitrification enhanced short-cut denitrification anaerobic ammonia oxidation process comprises a domestic sewage raw water tank 1, a multi-stage A/O (anoxic/oxic) tank 14, a secondary sedimentation tank 12 and a medicament adding tank 26. The multistage A/O pool 14 comprises three groups of reaction zones, each group of reaction zones comprises an anoxic zone, a front aerobic zone and a rear aerobic zone which are sequentially connected through a pipeline, and the anoxic zone of each group of reaction zones is connected with the rear aerobic zone of the front group of reaction zones through a pipeline. In fig. 1, the multistage a/O tank 14 is sequentially provided with a first anoxic zone 3, a first front aerobic zone 4, a first rear aerobic zone 5, a second anoxic zone 6, a second front aerobic zone 7, a second rear aerobic zone 8, a third anoxic zone 9, a third front aerobic zone 10, and a third rear aerobic zone 11. Domestic sewage in the domestic sewage raw water tank 1 enters into first anoxic zone 3, second anoxic zone 6 and third anoxic zone 9 respectively through intake pump 2 through first inlet gate valve 15, second inlet gate valve 16 and third inlet gate valve 17, the play water in aerobic zone 11 passes through two heavy ponds 12 behind the third and discharges through outlet pipe 13, the mud exit linkage in two heavy ponds 12 has back flow and mud pipe, be equipped with mud return gate valve 32 on the back flow, mud backwash pump 31, be equipped with mud discharge gate valve 33 on the mud pipe. The sludge flows back to the first anoxic zone 3, and the ferrous salt in the agent adding box 26 is conveyed to the first anoxic zone 3, the second anoxic zone 6 and the third anoxic zone 9 of the multistage A/O pool 14 through a pipeline by a medicine adding pump 27. The aeration amount of each front and rear aerobic zone is controlled by an aeration fan 25, an aeration control gate valve 24 and a flow meter 23 which are connected in sequence, and aeration is carried out by an aeration disc 22. Fixed anaerobic ammonia oxidation fillers 21 are placed in each anoxic zone, the fixed anaerobic ammonia oxidation fillers 21 are polyethylene fillers with the diameter of 25mm, and the filling ratio is 10-20%. A first stirrer 15, a second stirrer 16 and a third stirrer 17 are respectively arranged in the first anoxic zone 3, the second anoxic zone 6 and the third anoxic zone 9;
the invention also provides a method for realizing nitrogen and phosphorus removal of town sewage through a ferric salt denitrification reinforced short-cut denitrification anaerobic ammonia oxidation process based on the device, which comprises the following steps:
1) Inoculating surplus sludge of the urban sewage treatment plant, adding the surplus sludge into the multistage A/O tank 14 to keep the sludge concentration at 4000mg/L, and then adding anaerobic ammonia oxidation fillers 21 inoculated with an anaerobic ammonia oxidation biomembrane into a first anoxic zone 3, a second anoxic zone 6 and a third anoxic zone 9 in the multistage A/O tank 14, wherein the filling ratio is 15%;
2) Raw water (domestic sewage in a domestic sewage raw water tank 1) is respectively pumped into three anoxic zones of a multi-stage A/O pool 14 from the domestic sewage raw water tank 1 through a water inlet pump 2 to carry out short-cut denitrification anaerobic ammonia oxidation denitrification, phosphorus accumulating bacteria generate phosphorus release reaction, sludge from a secondary sedimentation pool 12 flows back to a first anoxic zone 3 through a sludge reflux pump 31, and the sludge reflux ratio is controlled to be 80-150%; the mixed liquid of raw water and sludge flows into a first front aerobic zone 4 from a first anoxic zone 3, flows into a first rear aerobic zone 5 from the first front aerobic zone 4, then flows through a second anoxic zone 6, a second front aerobic zone 7, a second rear aerobic zone 8, a third anoxic zone 9, a third front aerobic zone 10 and a third rear aerobic zone 11 in sequence, finally enters a secondary sedimentation tank 12, stays for 3-4 hours, so that mud-water separation is realized, and the effluent is discharged through an overflow weir and a water outlet pipe 13; the sludge reflux ratio and the mixed liquor flow direction of the second anoxic zone 3 and the third anoxic zone are similar to those of the first anoxic zone 3.
3) 90g/L of divalent iron salt is continuously pumped into the first anoxic zone 3, the second anoxic zone 6 and the third anoxic zone 9 of the multistage A/O tank 14 from a medicament feeding box 26 through a feeding pump 27, and the concentration of FeII in the anoxic zones is controlled to be kept at 10mg/L all the time. Fe (II) takes nitrate nitrogen as an electron acceptor under the action of ferric salt denitrifying microorganisms to reduce the nitrate nitrogen into nitrite, and the generated nitrite and ammonia nitrogen in inlet water are subjected to anaerobic ammonia oxidation reaction on a filler with anaerobic ammonia oxidizing bacteria. In this process, fe (II) is oxidized to Fe (III); the ferric salt is used as a flocculating agent with excellent performance, and can generate flocculation with phosphate in water, so that the synchronous removal of nitrogen and phosphorus is realized;
4) Controlling the aeration fan 25 to regulate the oxygen charging amount of the aerobic zone, and controlling the dissolved oxygen concentration of the aerobic zone to be 1 mg/L-2 mg/L;
5) The Hydraulic Retention Time (HRT) of the multi-stage A/O pool 14 is controlled to be 12h, the discharge of the excess sludge is controlled by a sludge discharge gate valve (33), and the sludge age (SRT) of the floc sludge in the reactor is maintained to be 13d.
Aiming at the characteristics that in a continuous flow multistage A/O process, the anaerobic ammonium oxidation bacteria substrate is unstable in source and is easily influenced by external environments such as high dissolved oxygen and the like and difficult to enrich and retain, on the basis of realizing short-range denitrification anaerobic ammonium oxidation, the invention provides a stable substrate source for anaerobic ammonium oxidation bacteria by using a ferric salt denitrification technology to supplement and strengthen the anaerobic ammonium oxidation reaction. Meanwhile, as a common phosphorus removal agent, the addition of Fe (II) salt not only enhances the denitrification efficiency of the anaerobic ammonia oxidation, but also improves the phosphorus removal efficiency of a multistage A/O system (which refers to the mixed liquid of sludge and domestic sewage in a multistage A/O tank).
According to the invention, the short-cut denitrification anaerobic ammonia oxidation process is combined with the ferric salt denitrification technology, and the Fe (II) ferric salt is added into the multistage A/O tank, so that the functional effect of supplementing anaerobic ammonia oxidation is enhanced, a stable substrate source is further provided for anaerobic ammonia oxidation bacteria, the denitrification contribution rate of anaerobic ammonia oxidation is improved, and a good phosphorus removal effect is achieved. Provides a stable and efficient new technology for the advanced treatment of the urban sewage and promotes the popularization and application of the anaerobic ammonia oxidation process in the sewage treatment.
The above description is only a preferred embodiment of the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A device for realizing nitrogen and phosphorus removal of town sewage by a ferric salt denitrification enhanced short-cut denitrification anaerobic ammonia oxidation process is characterized in that: comprises a domestic sewage raw water tank (1), a multi-stage A/O tank (14), a secondary sedimentation tank (12) and a medicament adding tank (26); the multi-stage A/O pool (14) comprises at least three groups of reaction zones, each group of reaction zones comprises an anoxic zone, a front aerobic zone and a rear aerobic zone which are sequentially connected through a pipeline, and the anoxic zone of each group of reaction zones is connected with the rear aerobic zone of the front group of reaction zones through a pipeline; the water outlet of the domestic sewage raw water tank (1) is connected with the anoxic zones of the reaction zones through pipelines, the water outlet of the aerobic zone behind the last reaction zone is connected with a secondary sedimentation tank (12), the sludge outlet of the secondary sedimentation tank (12) is connected with a return pipe and a sludge discharge pipe, the return pipe is connected to the anoxic zone of the first reaction zone, and the ferrous salt in the agent adding box (26) is conveyed to the anoxic zones of the reaction zones through pipelines through a medicine adding pump (27); the bottom of each front aerobic zone and the bottom of each rear aerobic zone are provided with aeration discs (22) connected with aeration fans (25), and each anoxic zone is provided with anaerobic ammonia oxidation fillers (21) and a stirrer.
2. The device for realizing nitrogen and phosphorus removal of town sewage through ferric salt denitrification enhanced short-cut denitrification anaerobic ammonia oxidation process of claim 1, which is characterized in that: an aeration control gate valve (24) and a flow meter (23) are arranged between the aeration disc (22) and the aeration fan (25).
3. The device for realizing nitrogen and phosphorus removal of town sewage by the ferric salt denitrification enhanced short-cut denitrification anaerobic ammonia oxidation process as claimed in claim 2, wherein: the return pipe is provided with a sludge return gate valve (32) and a sludge return pump (31).
4. The device for realizing nitrogen and phosphorus removal of town sewage by the ferric salt denitrification enhanced short-cut denitrification anaerobic ammonia oxidation process as claimed in claim 3, wherein: and a sludge discharge gate valve (33) is arranged on the sludge discharge pipe.
5. The device for realizing nitrogen and phosphorus removal of town sewage by the ferric salt denitrification enhanced short-cut denitrification anaerobic ammonia oxidation process as claimed in claim 4, wherein: the filling ratio of the anaerobic ammonia oxidation filler in the anoxic zone is 10-20%.
6. A method for realizing nitrogen and phosphorus removal of urban sewage by a ferric salt denitrification enhanced short-cut denitrification anaerobic ammonia oxidation process is based on the device of any one of claims 1 to 5, and is characterized by comprising the following steps:
1) Inoculating the excess sludge of the urban sewage treatment plant, adding the excess sludge into a multistage A/O tank (14) to keep the sludge concentration at 3500-4500mg/L, adding an anaerobic ammonia oxidation filler (21) inoculated with an anaerobic ammonia oxidation biomembrane to each anoxic zone in the multistage A/O tank (14), wherein the filling ratio of the anaerobic ammonia oxidation filler is 10-20%;
2) Raw water is pumped into each anoxic zone of a multi-stage A/O pool (14) from a domestic sewage raw water tank (1) through a water inlet pump (2) respectively to carry out short-cut denitrification anaerobic ammonia oxidation denitrification, phosphorus accumulating bacteria generate phosphorus release reaction, sludge from a secondary sedimentation pool (12) flows back to the anoxic zone of a first reaction zone, and the sludge reflux ratio is controlled to be 80-150%; the mixed liquid of the sludge and the raw water flows backwards from the anoxic zone of the first reaction zone, finally enters a secondary sedimentation tank (12), stays in the secondary sedimentation tank (12) for 3-4 hours to realize mud-water separation, and the separated water is discharged outside;
3) Continuously pumping 80-100 g/L of ferrous salt into each anoxic zone of the multistage A/O pool (14), and controlling the concentration of Fe (II) in each anoxic zone to be kept at 5-10 mg/L all the time;
4) Regulating and controlling the oxygen charging amount of each front and rear aerobic zones, and controlling the dissolved oxygen concentration of the front and rear aerobic zones to be 1 mg/L-2 mg/L;
5) The hydraulic retention time of the multi-stage A/O tank (14) is controlled to be 10-15 h, the discharge of the residual sludge in the secondary sedimentation tank (12) is controlled by a sludge discharge gate valve (33), and the sludge age of the floc sludge in the reactor is maintained to be 10-15 d.
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| US20180134580A1 (en) * | 2016-11-15 | 2018-05-17 | Jiangnan University | Ecological Method for Denitrification and Phosphorus Removal in Wastewater Treatment Process |
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| CN113087143A (en) * | 2021-04-19 | 2021-07-09 | 北京交通大学 | Domestication method of iron metabolism coupling anaerobic ammonia oxidation sludge, and treatment method and system of ammonia nitrogen wastewater |
| CN113415910A (en) * | 2021-06-04 | 2021-09-21 | 北京工业大学 | Device and method for denitrification coupling anaerobic ammonium oxidation biological nitrogen and phosphorus removal in iron ammonium oxidation enhanced AAO process |
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- 2022-08-29 CN CN202211047574.5A patent/CN115286107A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180134580A1 (en) * | 2016-11-15 | 2018-05-17 | Jiangnan University | Ecological Method for Denitrification and Phosphorus Removal in Wastewater Treatment Process |
| CN112645449A (en) * | 2020-12-12 | 2021-04-13 | 北京工业大学 | Device and method for enhancing nitrogen and phosphorus removal by combining multistage AO short-cut denitrification coupling Anammox with sludge hydrolysis acidification |
| CN113087143A (en) * | 2021-04-19 | 2021-07-09 | 北京交通大学 | Domestication method of iron metabolism coupling anaerobic ammonia oxidation sludge, and treatment method and system of ammonia nitrogen wastewater |
| CN113415910A (en) * | 2021-06-04 | 2021-09-21 | 北京工业大学 | Device and method for denitrification coupling anaerobic ammonium oxidation biological nitrogen and phosphorus removal in iron ammonium oxidation enhanced AAO process |
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