CN115259379A - Device and method for realizing double short-range coupling anaerobic ammonia oxidation in multistage A/O continuous flow reactor with sectional water inflow - Google Patents
Device and method for realizing double short-range coupling anaerobic ammonia oxidation in multistage A/O continuous flow reactor with sectional water inflow Download PDFInfo
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- CN115259379A CN115259379A CN202211040855.8A CN202211040855A CN115259379A CN 115259379 A CN115259379 A CN 115259379A CN 202211040855 A CN202211040855 A CN 202211040855A CN 115259379 A CN115259379 A CN 115259379A
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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
- 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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention relates to the field of biological sewage treatment, in particular to a device for realizing double short-range coupling anaerobic ammonia oxidation in a multistage A/O continuous flow reactor with sectional water inlet, which comprises a domestic sewage raw water tank, the multistage A/O continuous flow reactor and a secondary sedimentation tank, domestic sewage is pumped into an anoxic zone of the multistage A/O continuous flow reactor in different points, short-range denitrification coupling anaerobic ammonia oxidation denitrification and phosphorus release are carried out under the anoxic condition, sludge mixed liquid enters an aerobic zone to carry out synchronous short-range nitrification coupling anaerobic ammonia oxidation denitrification and phosphorus absorption, anaerobic ammonia oxidizing bacteria can be better kept by arranging a fixed anaerobic ammonia oxidizing filler in the reactor, and double short-range coupling anaerobic ammonia oxidation is stably realized in the multistage A/O continuous flow reactor with sectional water inlet, so that deep denitrification and phosphorus removal are 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 double short-range coupling anaerobic ammonia oxidation in a multistage A/O continuous flow reactor with sectional water inlet, which are suitable for deep nitrogen and phosphorus removal of municipal domestic sewage.
Background
The anaerobic ammonia oxidation technology is a novel energy-saving and consumption-reducing technology and becomes a research hotspot in the field of sewage treatment, anaerobic ammonia oxidizing bacteria can generate nitrogen gas by using ammonia nitrogen and nitrite and generate a small amount of nitrate nitrogen, and in practical engineering application, anaerobic ammonia oxidation is usually combined with shortcut nitrification, so that 60% of aeration energy consumption and 100% of organic carbon sources can be saved, and 80% of residual sludge yield can be reduced. But the short-cut nitrification has great difficulty in maintaining stability, and the popularization and the use of the anaerobic ammonia oxidation process are limited. The short-cut denitrification process can convert nitrate nitrogen into nitrite under the anoxic condition so as to provide a substrate for anaerobic ammonia oxidation, can reduce the addition of a carbon source compared with the whole-cut denitrification, does not need aeration so as to save the aeration energy consumption, and provides a new idea for realizing anaerobic ammonia oxidation of a mainstream municipal sewage part. However, short-cut denitrification has strict requirements on the type of carbon source and the carbon-nitrogen ratio, and therefore, short-cut denitrification studies using domestic sewage with a complicated carbon source as a treatment target are few.
Research shows that the short-cut nitrification coupled anaerobic ammonia oxidation (PN/A) and the short-cut denitrification coupled anaerobic ammonia oxidation (PD/A) can be combined to exert different advantages to the maximum extent. In the process, PD/A can remove the generated nitrate and reduce the inhibition requirement on Nitrite Oxidizing Bacteria (NOB), and PN/A can reduce the external carbon source requirement and the aeration energy consumption. The process can meet the requirement of high-efficiency denitrification, reduces the requirement on flora structure control, and provides a new idea for realizing partial anaerobic ammonia oxidation of mainstream urban sewage.
Disclosure of Invention
The invention aims to provide a device and a method for realizing double short-range coupling anaerobic ammonia oxidation in a segmented water inlet multistage A/O continuous flow reactor, solves the problem that an underwater anaerobic ammonia oxidation process of mainstream municipal sewage is difficult to control, realizes deep denitrification and dephosphorization of the mainstream municipal domestic sewage, and has the advantages of low energy consumption, small occupied area and low cost.
The technical purpose of the invention is realized as follows:
the utility model provides a device that realizes two short distance coupling anammox in multistage AO continuous flow reactor of intaking in segmentation, including domestic sewage former water tank, multistage AO continuous flow reactor and two heavy ponds, multistage AO continuous flow reactor includes a plurality of mutual interval arrangement and the anoxic zone and the aerobic zone that communicate in proper order, every anoxic zone all is equipped with agitating unit and anammox filler, every aerobic zone all is equipped with aeration equipment and anammox filler, the delivery port of domestic sewage former water tank passes through the inlet channel and is connected with each anoxic zone, the delivery port in last aerobic zone passes through the pipeline and the entry linkage in two heavy ponds, the mud exit linkage in two heavy ponds has return line and outer discharge pipe, the return line is connected to the anoxic zone of first preceding stage.
Preferably, each anoxic zone consists of a preceding anoxic zone and a subsequent anoxic zone, the water inlet pipeline is connected with the preceding anoxic zone of each anoxic zone, and the preceding anoxic zone and the subsequent anoxic zone are respectively provided with a stirring device and an anaerobic ammonia oxidation filler.
Preferably, each aerobic zone is composed of a preceding aerobic zone and a succeeding aerobic zone, the preceding aerobic zone is provided with an aeration device and anaerobic ammonia oxidation filler, and the succeeding aerobic zone is provided with an aeration device.
Preferably, the volume ratio of the pre-stage anoxic zone, the post-stage anoxic zone, the pre-stage aerobic zone and the post-stage aerobic zone is 1.
Preferably, the aeration device comprises an air pump, aeration heads, a flow meter and a flow regulating valve, wherein the aeration heads are arranged at the bottom of the front-stage aerobic zone or the rear-stage aerobic zone, each aeration head is connected with the air pump through a pipeline, and the pipeline is provided with the flow meter and the flow regulating valve.
Preferably, the return line is provided with a sludge return control gate valve and a sludge return pump.
Preferably, the anaerobic ammonium oxidation packing has a packing ratio of 10-15% in both the anoxic zone and the aerobic zone.
A method for realizing double short-range coupling anaerobic ammonia oxidation comprises the following steps:
1) Starting the reactor:
inoculating return sludge of a municipal sewage treatment plant into the multistage A/O continuous flow reactor, and keeping the concentration of floc sludge in the reactor at 3000-5000 mg/L;
arranging anaerobic ammonia oxidation fillers in all the front-stage anoxic zones, the rear-stage anoxic zones and all the front-stage aerobic zones, wherein the filling ratio is 10-15%;
the water inflow of the multi-stage A/O continuous flow reactor is urban domestic sewage, the water inflow COD:120-240mg/L, NH 4 + -N:35-60mg/L, 3-4C/N, 12-15h of total hydraulic retention time and 80-150% of sludge reflux ratio; the dissolved oxygen concentration of each front stage aerobic zone is controlled to be 0.3-0.5mg/L, the dissolved oxygen concentration of each rear stage aerobic zone is controlled to be 1.0-2.0mg/L, and the sludge age of floc sludge is controlled to be 12-18d;
the anaerobic ammonia oxidation bacteria can utilize nitrite generated in the nitration process and ammonia nitrogen entering each preceding aerobic zone, and simultaneously, an anoxic structure in the anaerobic ammonia oxidation filler provides conditions for the growth and retention of the anaerobic ammonia oxidation bacteria;
anaerobic ammoxidation fillers in each front-stage anoxic zone and each rear-stage anoxic zone perform short-range denitrification coupling anaerobic ammoxidation reaction by using ammonia nitrogen and COD in the inlet water and nitrate nitrogen generated in each rear-stage aerobic zone, and phosphorus accumulating bacteria perform phosphorus release action by using an organic carbon source in the inlet water;
detecting the changes of ammonia nitrogen, nitrite, nitrate nitrogen, phosphorus and COD contents in the anoxic zone and the aerobic zone every day, wherein in each anoxic zone, the ammonia nitrogen concentration decreases from the front-stage anoxic zone to the rear-stage anoxic zone, which indicates that the anoxic zone has short-cut denitrification coupling anaerobic ammonia oxidation reaction; in each aerobic zone, if total inorganic nitrogen from the front-stage aerobic zone to the rear-stage aerobic zone is reduced, the nitrification in the front-stage aerobic zone is coupled with anaerobic ammonia oxidation, and the aerobic zone can remove phosphorus in the system by phosphorus absorption, so that the success of starting the dual-short-range anaerobic ammonia oxidation of the multistage A/O continuous flow reactor is proved;
2) Operation after reactor start-up: after being sent into a multi-stage A/O continuous flow reactor, the urban domestic sewage firstly enters a first front-stage anoxic zone and then flows backwards in sequence, and the hydraulic retention time of each front-stage anoxic zone and each rear-stage anoxic zone is 1-1.25h; the dissolved oxygen concentration of each front stage aerobic zone is controlled to be 0.3-0.5mg/L, the dissolved oxygen concentration of each rear stage aerobic zone is controlled to be 1.0-2.0mg/L, and the hydraulic retention time of each front stage aerobic zone and each rear stage aerobic zone is 1-1.25h; and detecting the contents of ammonia nitrogen, nitrite, nitrate nitrogen and phosphorus in the effluent of the secondary sedimentation tank, and finally achieving that the ammonia nitrogen content of the effluent is less than 0.5mg/L, the nitrite content of the effluent is less than 0.3mg/L, the nitrate nitrogen content of the effluent is less than 8.0mg/L and the phosphorus content of the effluent is less than 0.4mg/L.
The invention has the beneficial effects that: 1) The synchronous nitrogen and phosphorus removal is realized by adding no or a small amount of external carbon source, and the energy consumption for system operation is low; 2) Both denitrification and nitrification processes can provide substrates for the anammox bacteria, so that the anammox contribution rate of the system can be improved, and the actual engineering application of the anammox is facilitated; 3) Anaerobic ammonia oxidation filler is arranged, and the conditions of gradual reduction aeration and low dissolved oxygen are adopted to facilitate the occurrence of PN/A reaction in an aerobic zone, so that the aeration is saved.
Drawings
FIG. 1 is a schematic structural diagram of a device for realizing double short-range coupling anaerobic ammonia oxidation in a multistage A/O continuous flow reactor with sectional water inlet:
description of reference numerals: 1-domestic sewage raw water tank; 2-a multistage a/O continuous flow reactor; 3-a first pre-anoxic zone; 4-a first post-stage anoxic zone; 5-a first pre-stage aerobic zone; 6-a first post-stage aerobic zone; 7-a second preceding stage anoxic zone; 8-second post-stage anoxic zone; 9-second pre-stage aerobic zone; 10-a second post-stage aerobic zone; 11-third preceding stage anoxic zone; 12-a third post-stage anoxic zone; 13-third preceding stage aerobic zone; 14-a third post-stage aerobic zone; 15-a first water inlet pump; 16-a second water inlet pump; 17-a third water inlet pump; 18-a first stirrer; 19-a second stirrer; 20-a third stirrer; 21-a fourth stirrer; 22-a fifth mixer; 23-a sixth stirrer; 24-anammox filler; 25-secondary sedimentation tank; 26-a water outlet pipe; 27-an aerator; 28-a flow meter; 29-flow regulating valve; 30-an aeration pump; 31-sludge reflux pump; 32-sludge return flow control gate valve; 33-sludge discharge control 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, detachably, 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 fig. 1, the apparatus for implementing dual short-range coupling anaerobic ammonia oxidation in a multistage a/O continuous flow reactor with staged water inflow provided by the present invention comprises a raw domestic sewage tank 1, a multistage a/O continuous flow reactor 2 and a secondary sedimentation tank 25. The multistage a/O continuous flow reactor 2 comprises a first pre-stage anoxic zone 3, a first post-stage anoxic zone 4, a first pre-stage aerobic zone 5, a first post-stage aerobic zone 6, a second pre-stage anoxic zone 7, a second post-stage anoxic zone 8, a second pre-stage aerobic zone 9, a second post-stage aerobic zone 10, a third pre-stage anoxic zone 11, a third post-stage anoxic zone 12, a third pre-stage aerobic zone 13 and a third post-stage aerobic zone 14 in sequential communication, 1. As shown in FIG. 1, the water inlet and outlet of each of the pre-anoxic zone, the post-anoxic zone, the pre-aerobic zone and the post-aerobic zone are staggered up and down, so that domestic sewage can continuously flow in the multi-stage A/O continuous flow reactor 2.
Urban domestic sewage in the domestic sewage raw water tank 1 respectively enters a first pre-stage anoxic zone 3, a second pre-stage anoxic zone 7 and a third pre-stage anoxic zone 11 of the multistage A/O continuous flow reactor 2 through a first water inlet pump 15, a second water inlet pump 16, a third water inlet pump 17 and a water inlet pipeline. The first front-stage anoxic zone 3 is provided with a first stirrer 18, the first rear-stage anoxic zone 4 is provided with a second stirrer 19, the second front-stage anoxic zone 7 is provided with a third stirrer 20, the second rear-stage anoxic zone 8 is provided with a fourth stirrer 21, the third front-stage anoxic zone 11 is provided with a fifth stirrer 22, and the third rear-stage anoxic zone 12 is provided with a sixth stirrer 23.
Each front stage anoxic zone and the rear stage anoxic zone are provided with fixed anaerobic ammonia oxidation fillers 24, and the filling ratio is 10-15%. The water discharged from the first front stage anoxic zone 3 sequentially enters a first rear stage anoxic zone 4, a first front stage aerobic zone 5, a first rear stage aerobic zone 6, a second front stage anoxic zone 7, a second rear stage anoxic zone 8, a second front stage aerobic zone 9, a second rear stage aerobic zone 10, a third front stage anoxic zone 11, a third rear stage anoxic zone 12, a third front stage aerobic zone 13 and a third rear stage aerobic zone 14. The first preceding-stage aerobic zone 5, the second preceding-stage aerobic zone 9 and the second preceding-stage aerobic zone 13 are respectively filled with fixed anaerobic ammonia oxidation fillers 24, and the filling ratio is 10-15%. Each front stage anoxic zone and each rear stage anoxic zone are provided with an aeration device which comprises an aeration head 27, a flow meter 28, a flow regulating valve 29 and an air pump 30, wherein the flow meter, the flow regulating valve 29 and the air pump 30 are connected with the aeration head 27, and the aeration head 27 is arranged at the bottom of the front stage aerobic zone or the rear stage aerobic zone. The effluent of the third rear-stage aerobic zone 14 enters a secondary sedimentation tank 25, a sludge outlet of the secondary sedimentation tank 25 is connected with a return pipeline and an external discharge pipeline, one part of sludge is controlled by a sludge return control gate valve 32 and flows back to the first front-stage anoxic zone 3 through a sludge return pump 31, the other part of sludge is controlled by a sludge discharge control gate valve 33 of the external discharge pipeline to be discharged, and the treated effluent of the secondary sedimentation tank 25 is discharged through a water outlet pipe 26.
The invention also provides a method for realizing double-short-range coupling anaerobic ammonia oxidation by applying the device, which comprises the following steps:
(1) Starting the reactor: inoculating return sludge of a municipal sewage treatment plant into the multistage A/O continuous flow reactor 2, and keeping the concentration of floc sludge in the reactor at 3000-5000 mg/L; meanwhile, a fixed anaerobic ammonia oxidation filler 24 is arranged in the first front-stage anoxic zone 3, the first rear-stage anoxic zone 4, the second front-stage anoxic zone 7, the second rear-stage anoxic zone 8, the third front-stage anoxic zone 11, the third rear-stage anoxic zone 12, the first front-stage aerobic zone 5, the second front-stage aerobic zone 9 and the third front-stage aerobic zone 13, and the filling ratio is 10-15%. The water inflow of the multi-stage A/O continuous flow reactor is urban domestic sewage, the water inflow COD:120-240mg/L, NH 4 + -N (ammonia nitrogen): 35-60mg/L, 3-4C/N, 12-15h of total hydraulic retention time and 80-150% of sludge reflux ratio; the dissolved oxygen concentration of the first preceding stage aerobic zone 5, the second preceding stage aerobic zone 9 and the third preceding stage aerobic zone 13 is controlled to be 0.3-0.5mg/L, the dissolved oxygen concentration of the first later stage aerobic zone 6, the second later stage aerobic zone 10 and the third later stage aerobic zone 14 is controlled to be 1.0-2.0mg/L, and the sludge age of the floc sludge is controlled to be 12-18d; the first preceding-stage aerobic zone 5, the second preceding-stage aerobic zone 9 and the third preceding-stage aerobic zone 13 keep low dissolved oxygen for a long time to operate so as to reduce the adverse effect of high dissolved oxygen on anammox bacteria, so that the anammox bacteria can utilize nitrite generated in the nitration process and ammonia nitrogen entering the aerobic zone, and meanwhile, the anoxic structure in the filler provides conditions for the growth and retention of the anammox bacteria; anaerobic ammoxidation fillers in the first pre-stage anoxic zone 3, the first post-stage anoxic zone 4, the second pre-stage anoxic zone 7, the second post-stage anoxic zone 8, the third pre-stage anoxic zone 11 and the third post-stage anoxic zone 12 can utilize ammonia nitrogen and COD in the inlet water and nitrate nitrogen generated by the first post-stage aerobic zone 6, the second post-stage aerobic zone 10 and the third post-stage aerobic zone 14 to carry out short-range denitrification coupling anaerobic ammoxidation reaction, and phosphorus accumulating bacteria can utilize an organic carbon source in the inlet water to carry out phosphorus release; detecting the content change of ammonia nitrogen, nitrite, nitrate nitrogen, phosphorus and COD in six anoxic zones and six aerobic zones every dayThe method comprises the following steps that (1) conversion is carried out, wherein ammonia nitrogen concentration is reduced from a first front-stage anoxic zone 3 to a first rear-stage anoxic zone 4, from a second front-stage anoxic zone 7 to a second rear-stage anoxic zone 8, and from a third front-stage anoxic zone 11 to a third rear-stage anoxic zone 12 respectively, so that the anoxic zone is subjected to short-range denitrification coupling anaerobic ammonia oxidation reaction; the total inorganic nitrogen drops from the first preceding aerobic zone 5 to the first rear-stage aerobic zone 6, from the second preceding aerobic zone 9 to the second rear-stage aerobic zone 10, and from the third preceding aerobic zone 13 to the third rear-stage aerobic zone 14 respectively show that nitrification coupling anaerobic ammonia oxidation occurs in the first preceding aerobic zone 5, the second preceding aerobic zone 9 and the third preceding aerobic zone 13, and all the aerobic zones can remove phosphorus in a system (referring to a mixed solution of sludge and domestic sewage in the multistage A/O continuous flow reactor 2) by phosphorus absorption, thereby proving that the dual-short-range anaerobic ammonia oxidation of the multistage A/O continuous flow reactor 2 is successfully started.
(2) The process after the reactor is started is operated: the water inflow of the multistage A/O continuous flow reactor is urban domestic sewage, and the water inflow COD is as follows: 120-240mg/L, NH 4 + -N:35-60mg/L, 3-4C/N, 12-15h of total hydraulic retention time and 80-150% of sludge reflux ratio; the sludge age is 12-18d; the domestic sewage is pumped into a multi-stage A/O continuous flow reactor 2 and then enters a first front-stage anoxic zone 3, and the hydraulic retention time of each front-stage anoxic zone and each rear-stage anoxic zone is 1-1.25h. The dissolved oxygen concentration of the first preceding stage aerobic zone 5, the second preceding stage aerobic zone 9 and the third preceding stage aerobic zone 13 is controlled to be 0.3-0.5mg/L, the dissolved oxygen concentration of the first subsequent stage aerobic zone 6, the second subsequent stage aerobic zone 10 and the third subsequent stage aerobic zone 14 is controlled to be 1.0-2.0mg/L, the fixed anaerobic ammonia oxidation filler 24 is used for retaining anaerobic ammonia oxidation bacteria, the filling ratio is 10-15%, and the hydraulic retention time of each preceding stage aerobic zone and each subsequent stage aerobic zone is 1-1.25h. Detecting the contents of ammonia nitrogen, nitrite, nitrate nitrogen and phosphorus in the effluent of the secondary sedimentation tank 25 to finally achieve the purpose of effluent ammonia nitrogen<0.5mg/L of nitrite in effluent<0.3mg/L, effluent nitro-nitrogen<8.0mg/L, phosphorus yielding water<0.4mg/L。
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 (8)
1. The utility model provides a device that realizes two short distance coupling anaerobic ammonia oxidation in multistage AO continuous flow reactor of segmentation water inflow, including domestic sewage former water tank (1), multistage AO continuous flow reactor (2) and two heavy ponds (25), multistage AO continuous flow reactor (2) include a plurality of each other interval arrangement and communicate in proper order anoxic zone and aerobic zone, every anoxic zone all is equipped with agitating unit and anaerobic ammonia oxidation filler, every aerobic zone all is equipped with aeration equipment and anaerobic ammonia oxidation filler, the delivery port of domestic sewage former water tank (1) passes through the inlet channel and is connected with each anoxic zone, the delivery port of last aerobic zone passes through the pipeline and is connected with the entry of two heavy ponds (25), the mud exit linkage of two heavy ponds (25) has backflow pipeline and outer discharge pipe, backflow pipeline is connected to first anoxic zone.
2. The device for realizing double short-range coupling anaerobic ammonia oxidation in the multistage A/O continuous flow reactor with water feeding in a segmented mode according to claim 1, wherein: each anoxic zone is composed of a preceding anoxic zone and a subsequent anoxic zone, the water inlet pipeline is connected with the preceding anoxic zone of each anoxic zone, and the preceding anoxic zone and the subsequent anoxic zone are respectively provided with a stirring device and anaerobic ammonia oxidation fillers.
3. The device for realizing double short-range coupling anaerobic ammonia oxidation in the multistage A/O continuous flow reactor with water inflow in a segmented mode according to claim 2, wherein: each aerobic zone consists of a front-stage aerobic zone and a rear-stage aerobic zone, the front-stage aerobic zone is provided with an aeration device and anaerobic ammonia oxidation fillers, and the rear-stage aerobic zone is provided with an aeration device.
4. The device for realizing double short-range coupling anaerobic ammonia oxidation in the multistage A/O continuous flow reactor with water feeding in a segmented mode according to claim 3, wherein: the volume ratio of the front-stage anoxic zone, the rear-stage anoxic zone, the front-stage aerobic zone and the rear-stage aerobic zone is 1.
5. The device for realizing double short-range coupling anaerobic ammonia oxidation in the multistage A/O continuous flow reactor with water feeding in a segmented mode according to claim 4, wherein: the aeration device comprises an air pump (30), aeration heads (27), a flow meter (28) and a flow regulating valve (29), wherein the aeration heads (27) are arranged at the bottom of a front-stage aerobic zone or a rear-stage aerobic zone, each aeration head is connected with the air pump (30) through a pipeline, and the flow meter (28) and the flow regulating valve (29) are arranged on the pipeline.
6. The device for realizing double short-range coupling anaerobic ammonia oxidation in the multistage A/O continuous flow reactor with water feeding in a segmented mode according to claim 5, wherein: and the return pipeline is provided with a sludge return flow control gate valve and a sludge return pump.
7. The device for realizing double short-range coupling anaerobic ammonia oxidation in the multistage A/O continuous flow reactor with water feeding in a segmented mode according to claim 6, wherein: the filling ratio of the anaerobic ammonia oxidation filling material in the anoxic zone and the aerobic zone is 10-15%.
8. A method for realizing double short-range coupling anaerobic ammonia oxidation, which is based on a device for realizing double short-range coupling anaerobic ammonia oxidation in the segmented water-feeding multistage A/O continuous flow reactor of any one of claims 3 to 7, and is characterized by comprising the following steps:
1) Starting the reactor:
inoculating return sludge of a municipal sewage treatment plant into the multistage A/O continuous flow reactor (2), and keeping the concentration of floc sludge in the reactor at 3000-5000 mg/L;
anaerobic ammonia oxidation fillers (24) are arranged in all front-stage anoxic zones, all rear-stage anoxic zones and all front-stage aerobic zones, and the filling ratio is 10-15%;
the water inflow of the multistage A/O continuous flow reactor (2) is urban domestic sewage, and the water inflow COD is as follows: 120-240mg/L, NH 4 + -N:35-60mg/L, 3-4C/N, 12-15h of total hydraulic retention time and 80-150% of sludge reflux ratio; the dissolved oxygen concentration of each front stage aerobic zone is controlled at 0.3-0.5mg/L, and the dissolved oxygen concentration of each rear stage aerobic zone is controlledThe sludge age of the floc sludge is controlled to be 12-18 days at 1.0-2.0 mg/L;
the anaerobic ammonia oxidation bacteria can utilize nitrite generated in the nitration process and ammonia nitrogen entering each preceding aerobic zone, and simultaneously, an anoxic structure in the anaerobic ammonia oxidation filler provides conditions for the growth and retention of the anaerobic ammonia oxidation bacteria;
anaerobic ammoxidation fillers in each front-stage anoxic zone and each rear-stage anoxic zone perform short-range denitrification coupling anaerobic ammoxidation reaction by using ammonia nitrogen and COD in the inlet water and nitrate nitrogen generated in each rear-stage aerobic zone, and phosphorus accumulating bacteria perform phosphorus release action by using an organic carbon source in the inlet water;
detecting the content changes of ammonia nitrogen, nitrite, nitrate nitrogen, phosphorus and COD in the anoxic zone and the aerobic zone every day, wherein in each anoxic zone, the concentration of ammonia nitrogen is reduced from the front-stage anoxic zone to the rear-stage anoxic zone, which indicates that the anoxic zone has short-range denitrification coupling anaerobic ammonia oxidation reaction; in each aerobic zone, when the total inorganic nitrogen is reduced from the front-stage aerobic zone to the rear-stage aerobic zone, the nitrification in the front-stage aerobic zone is coupled with the anaerobic ammonia oxidation, and all the aerobic zones can absorb phosphorus to remove systematic phosphorus, so that the dual-short-range anaerobic ammonia oxidation of the multi-stage A/O continuous flow reactor (2) is successfully started;
2) Operation after reactor start-up: after being sent into the multi-stage A/O continuous flow reactor (2), the urban domestic sewage firstly enters a first front-stage anoxic zone and then flows backwards in sequence, and the hydraulic retention time of each front-stage anoxic zone and each rear-stage anoxic zone is 1-1.25h; the dissolved oxygen concentration of each front stage aerobic zone is controlled to be 0.3-0.5mg/L, the dissolved oxygen concentration of each rear stage aerobic zone is controlled to be 1.0-2.0mg/L, and the hydraulic retention time of each front stage aerobic zone and each rear stage aerobic zone is 1-1.25h; and detecting the contents of ammonia nitrogen, nitrite, nitrate nitrogen and phosphorus in the effluent of the secondary sedimentation tank (25), and finally achieving that the ammonia nitrogen, nitrite and nitrate nitrogen in the effluent are less than 0.5mg/L, nitrite and nitrate nitrogen in the effluent are less than 0.3mg/L, nitrate and phosphorus in the effluent are less than 8.0mg/L and phosphorus in the effluent is less than 0.4mg/L.
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