CN217650985U

CN217650985U - AAOO limit nitrogen and phosphorus removal processing system

Info

Publication number: CN217650985U
Application number: CN202221556916.1U
Authority: CN
Inventors: 孙鹏; 杨日剑; 代道朋; 刘矿洲; 鲍习峰
Original assignee: Jiangsu Zhongpeng Environmental Protection Group Co ltd
Current assignee: Jiangsu Zhongpeng Environmental Protection Group Co ltd
Priority date: 2022-06-21
Filing date: 2022-06-21
Publication date: 2022-10-25
Anticipated expiration: 2032-06-21

Abstract

The utility model discloses an AAOO limit denitrification and dephosphorization treatment system, which comprises a sewage treatment tank, an anaerobic zone, an anoxic zone, an aerobic zone and a low-oxygen zone are arranged in the sewage treatment tank; the utility model discloses internal reflux ratio has been reduced, backward flow dissolved oxygen content in the reduction mixed liquid, promote anoxic zone oxygen deficiency effect, improve the denitrogenation efficiency of technology, aerobic zone effective volume is less than traditional technology simultaneously, it is excessive to avoid mud aeration, save the aeration rate, sewage is aerobic zone and is accomplished nitration, and accomplish intracellular carbon source accumulation in the uneven growth state through oxygen deficiency and quick good oxygen, thereby utilize nitrate nitrogen to further reduce nitrogen phosphorus content in the sewage for electron acceptor in the hypoxia zone, hypoxia zone nitrate nitrogen content reduces, internal reflux volume reduces to some extent than traditional technology, oxygen deficiency section denitrification load has further been reduced, reduce the external carbon source demand, external carbon source reducible more than 30%, sludge production is low, engineering investment and working costs all obtain reducing.

Description

AAOO limit nitrogen and phosphorus removal processing system

Technical Field

The utility model relates to a sewage treatment technical field especially relates to an AAOO limit nitrogen and phosphorus removal processing system.

Background

In recent years, the sewage treatment industry in China has been large in scale, the water pollution control effect is remarkable, by 2020, 2618 seats of urban sewage treatment plants in China daily treat 19267 million cubic meters of sewage, the treatment scale is large, the mainstream denitrification and phosphorus accumulation bacteria phosphorus removal process of the current sewage treatment plants is based on the denitrification and phosphorus accumulation bacteria phosphorus removal theory, a single biological treatment system is cultured to sequentially treat single pollutants, a large amount of carbon sources are required to be added in an anoxic zone to create denitrification conditions, an aerobic zone meets nitrification reaction and aerobic phosphorus absorption reaction, the sewage aeration quantity is increased, the operation cost and the one-time engineering investment of the sewage treatment plant are increased, the sludge production quantity is large, and the sludge treatment is also successfully and urgently needed to solve a great difficulty in China.

Along with the increasing strictness of the country in ecological regulation of water environment, environmental protection departments in various provinces and cities gradually improve the standard of sewage disposal in rivers, the primary A standard of pollutant discharge standard of urban sewage treatment plant (GB 18918-2002) is improved to the IV class water body standard of surface water environmental quality standard (GB 3838-2002), the total phosphorus and total nitrogen effluent is continuously strict, great challenge is brought to the operation of sewage treatment plants, the sewage treatment plants can only continuously increase the processes of deep treatment of total phosphorus and total nitrogen, the operation cost and the engineering investment of sewage treatment are further increased, therefore, the utility model provides an AAOO limit nitrogen and phosphorus removal treatment system to solve the problems existing in the prior art.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model aims to provide an AAOO limit nitrogen and phosphorus removal processing system and technology solves the problem that current sewage treatment system mud output is many, the engineering investment is big and the working costs is high.

In order to realize the utility model discloses a purpose, the utility model discloses a following technical scheme realizes: the utility model provides a AAOO limit nitrogen and phosphorus removal processing system, includes the sewage treatment pond, inside anaerobic zone, anoxic zone, aerobic zone and the hypoxemia district of being equipped with of sewage treatment pond, anaerobic zone, anoxic zone, aerobic zone and hypoxemia district distribute in proper order and separate through the baffle from a left side to the right side in the sewage treatment pond, one side upper portion that the sewage treatment pond is close to anaerobic zone is equipped with inlet tube and the sludge return pipe of inserting anaerobic zone, one side that anaerobic zone was kept away from to the hypoxemia district bottom is equipped with mixed liquid backwash pump, the output of mixed liquid backwash pump is connected with anoxic zone through mixed liquid return pipe, one side upper portion that the sewage treatment pond is close to the hypoxemia district is equipped with the outlet pipe of inserting the hypoxemia district, aerobic zone and the inside bottom in hypoxemia district all are equipped with aeration facility.

The further improvement lies in that: the anaerobic zone is communicated with the anoxic zone through a water outlet at the bottom, the anoxic zone is communicated with the aerobic zone through a water outlet at the upper part, and a water outlet at the bottom of the aerobic zone is communicated with the hypoxic zone.

The further improvement lies in that: the main functions of the aerobic zone are nitration reaction, internal carbon source accumulation and aerobic phosphorus uptake, the nitration reaction rate is lower than the internal carbon source accumulation and the aerobic phosphorus uptake, and the dissolved oxygen in the aerobic zone is maintained at more than 2.0 mg/L.

The further improvement lies in that: the low oxygen region utilizes nitrification reaction of the aerobic region to generate nitrate nitrogen as combined oxygen, consumes accumulated internal carbon source to carry out denitrification and dephosphorization reaction, the ratio of the volume of the low oxygen region to the phosphorus absorption volume of the aerobic region is 2-3:1, the dissolved oxygen of the aerobic region is maintained above 2.0mg/L, and the dissolved oxygen of the low oxygen region is maintained below 1.0 mg/L.

The further improvement is that: the aeration facilities are provided with air adjusting valves, the aeration facilities are arranged in the aerobic zone in a way of encryption arrangement, and the density of the aeration facilities in the low-oxygen zone is lower than that of the aeration facilities in the aerobic zone.

The further improvement lies in that: stirring facilities are arranged in the anaerobic zone and the anoxic zone, dissolved oxygen in the anaerobic zone is controlled to be below 0.2mg/L, and dissolved oxygen in the anoxic zone is controlled to be below 0.5 mg/L.

The further improvement lies in that: the one end that sewage treatment pond was kept away from to the outlet pipe is connected with two heavy ponds, two mud in heavy pond backward flow to the anaerobic zone and mix with intaking, and mud reflux ratio control is 70% ~ 100%, mixed liquid backwash pump is passed through in the hypoxemia district, and the liquid is nitrified to the anoxic zone in the backward flow, and nitrify the liquid reflux ratio control and be 200% ~ 300%.

The beneficial effects of the utility model are that: the utility model discloses a set up the anaerobic zone in sewage treatment pond, the anoxic zone, aerobic zone and low oxygen district, the internal reflux ratio has been reduced, backward flow dissolved oxygen content in the reduction mixed liquid, promote anoxic zone oxygen deficiency effect, improve the denitrogenation efficiency of technology, simultaneously aerobic zone effective volume is less than traditional technology, it is excessive to avoid mud aeration, the aeration rate is saved, sewage is aerobic zone and is accomplished nitration, and accomplish intracellular carbon source accumulation in the uneven growth state through oxygen deficiency and quick aerobic, thereby utilize nitrate nitrogen to further reduce nitrogen phosphorus content in the sewage for electron acceptor in the low oxygen district, low oxygen district nitrate nitrogen content reduces, the traditional technology of internal reflux ratio reduces to some extent, oxygen deficiency section denitrification load has further been reduced, reduce the external carbon source demand, the reducible more than 30% of external carbon source, sludge production is low, engineering investment and working costs all obtain reducing.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic diagram of the system structure of the present invention.

Wherein: 1. a sewage treatment tank; 2. an anaerobic zone; 3. an anoxic zone; 4. an aerobic zone; 5. a low oxygen zone; 6. a water inlet pipe; 7. a sludge return pipe; 8. a mixed liquid reflux pump; 9. a mixed liquid return pipe; 10. a water outlet pipe; 11. an aeration facility.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

Referring to fig. 1, the embodiment provides an AAOO limiting nitrogen and phosphorus removal treatment system, which includes a sewage treatment tank 1, an anaerobic zone 2, an anoxic zone 3, an aerobic zone 4 and a hypoxic zone 5 are sequentially distributed in the sewage treatment tank 1 from left to right, the anaerobic zone 2, the anoxic zone 3, the aerobic zone 4 and the hypoxic zone 5 are sequentially communicated in the sewage treatment tank 1 from left to right and are separated by a partition plate, sewage undergoes two aerobic stages in the sewage treatment tank, the aerobic zone 4 in the first stage is an internal carbon source accumulation stage and phosphorus accumulation bacteria aerobic phosphorus absorption, the hypoxic zone 5 in the second stage is limiting nitrogen removal, microorganisms utilize nitrate nitrogen to combine an internal carbon source in oxygen metabolism, and simultaneously absorb phosphate to perform anabolism, so as to realize limiting nitrogen and phosphorus removal, meanwhile, the phosphorus-accumulating bacteria aerobic phosphorus absorption reverse reaction caused by insufficient dissolved oxygen and excessive or overlong dissolved oxygen is avoided in a low-oxygen environment, the total phosphorus of effluent is influenced, a water inlet pipe 6 and a sludge return pipe 7 which are connected into the anaerobic zone 2 are arranged on the upper portion of one side, close to the anaerobic zone 2, of the sewage treatment tank 1, a mixed liquid return pump 8 is arranged on one side, far away from the anaerobic zone 2, of the bottom of the low-oxygen zone 5, the output end of the mixed liquid return pump 8 is connected with the anoxic zone 3 through a mixed liquid return pipe 9, one end, located in the anoxic zone 3, of the mixed liquid return pipe 9 is located on the upper portion of the anoxic zone 3, a water outlet pipe 10 connected into the low-oxygen zone 5 is arranged on the upper portion of one side, close to the low-oxygen zone 5, treated sewage flows out of the water outlet pipe 10 and enters the next-stage treatment device, namely a secondary sedimentation tank, and aeration facilities 11 are arranged at the bottom ends inside the aerobic zone 4 and the low-oxygen zone 5.

The anaerobic zone 2 is communicated with the anoxic zone 3 through a water outlet at the bottom, the anoxic zone 3 is communicated with the aerobic zone 4 through a water outlet at the upper part, and a water outlet at the bottom of the aerobic zone 4 is communicated with the hypoxic zone 5, so that sewage can flow through the anaerobic zone 2, the anoxic zone 3, the aerobic zone 4 and the hypoxic zone 5 in sequence.

The main functions of the aerobic zone 4 are nitrification reaction, internal carbon source accumulation and aerobic phosphorus uptake, the nitrification reaction rate is lower than the internal carbon source accumulation and the aerobic phosphorus uptake, and the dissolved oxygen in the aerobic zone 4 is maintained at more than 2.0 mg/L.

The low oxygen zone 5 utilizes the nitrification reaction of the aerobic zone 4 to generate nitrate nitrogen as combined oxygen, consumes the accumulated internal carbon source to carry out the denitrification and dephosphorization reaction, the ratio of the volume of the low oxygen zone 5 to the phosphorus absorption volume of the aerobic zone 4 is 2-3:1, the average mixed concentration of the sludge in the sewage treatment tank 1 is 4-6 g/L, the dissolved oxygen of the aerobic zone 4 is maintained above 2.0mg/L, the dissolved oxygen of the low oxygen zone 5 is maintained below 1.0mg/L, and the air volume of the aeration facility 11 is selected according to the above.

The aeration facilities 11 are provided with air adjusting valves for controlling the concentration of dissolved oxygen, the aeration facilities 11 are arranged in the aerobic zone 4 in an encrypted arrangement mode, and the density of the aeration facilities 11 in the low-oxygen zone 5 is half of that of the aeration facilities 11 in the aerobic zone 4, so that the aeration quantity is reduced, namely, the energy-saving and low-carbon operation is realized.

Stirring facilities for fully mixing the return sludge and the nitrified liquid are arranged in the anaerobic zone 2 and the anoxic zone 3, the dissolved oxygen in the anaerobic zone 2 is controlled to be below 0.2mg/L, and the dissolved oxygen in the anoxic zone 3 is controlled to be below 0.5 mg/L.

One end of the water outlet pipe 10, which is far away from the sewage treatment tank 1, is connected with a secondary sedimentation tank, the secondary sedimentation tank is an existing conventional secondary sedimentation tank and has no special requirement, the sludge concentration in the secondary sedimentation tank is controlled according to 8-10 g/L, the sludge in the secondary sedimentation tank flows back to the anaerobic zone 2 and is mixed with inlet water, the sludge reflux ratio is controlled to be 70% -100%, the low-oxygen zone 5 flows back nitrified liquid to the anoxic zone 2 through a mixed liquid reflux pump 8, and the reflux ratio of the nitrified liquid is controlled to be 200% -300%.

In the figure 1, the arrow direction is the water flow direction, and various operation parameters are adjusted in time in the operation process of the system, so that the operation effect of the whole biological treatment system reaches the design requirement.

When the device is used, sewage to be treated is firstly injected into a sewage treatment tank 1 by using a water inlet pipe 6, the sewage is subjected to biological treatment in the sewage treatment tank 1 by an anaerobic zone 2, an anoxic zone 3, an aerobic zone 4 and a low-oxygen zone 5 in series, anaerobic phosphorus release is firstly carried out in the anaerobic zone 2, meanwhile, organic matters in the sewage are utilized by phosphorus accumulating bacteria to synthesize PHB, then the sewage enters the anoxic zone 3 to be mixed with a reflux mixed solution of the low-oxygen zone 5, nitrate nitrogen in the sewage is removed, denitrification reaction is completed, water discharged from the anoxic zone 3 enters the aerobic zone 4, on one hand, the phosphorus accumulating bacteria utilize the PHB in vivo to aerobically absorb phosphorus, nitrifying bacteria convert ammonia nitrogen into the nitrate nitrogen to complete nitrification reaction, on the other hand, the microorganisms utilize intracellular carbon source to complete the synthesis by anaerobic oxygen deficiency through anaerobic oxygen deficiency to an unbalanced growth environment through anaerobic oxygen deficiency, then the water discharged from the anoxic zone 4 enters the low-oxygen zone 5, the microorganisms utilize molecular oxygen as an electronic receptor to grow and metabolize by utilizing the intracellular carbon source, the microorganisms utilize the intracellular carbon source to complete the metabolism by utilizing the nitrate nitrogen as the nitrate as the electronic receptor, phosphorus removal mesh, the sewage after the sewage is treated by a sewage treatment tank after the sewage treatment, the sewage is treated by a sewage treatment tank, 10 percent sewage treatment, the sewage is separated by the sewage treatment zone 5, and then the sludge backflow mixed solution containing the sewage is discharged from a sewage settling zone 2, and the sewage is discharged from the sewage settling zone 4, and the sewage settling zone, and the sewage is discharged from the sewage settling zone 2, and the sewage settling zone, and the sewage is discharged from the sewage settling zone 4, and the sewage is separated by a sewage settling zone 2, and the sewage outlet pipe 80 percent of the sewage is discharged from the sewage settling zone 5, and the sewage settling zone after the sewage settling zone 5, and the sewage treatment tank, and the sewage is discharged from the sewage is separated by the sewage settling zone after the sewage settling zone 5.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An AAOO limit nitrogen and phosphorus removal processing system which is characterized in that: comprises a sewage treatment tank (1), wherein an anaerobic zone (2), an anoxic zone (3), an aerobic zone (4) and a low-oxygen zone (5) are arranged in the sewage treatment tank (1), the anaerobic zone (2), the anoxic zone (3), the aerobic zone (4) and the low-oxygen zone (5) are sequentially distributed from left to right in the sewage treatment tank (1) and are separated by a partition plate, a water inlet pipe (6) and a sludge return pipe (7) which are connected into the anaerobic zone (2) are arranged on the upper part of one side of the sewage treatment tank (1) close to the anaerobic zone (2), one side that anaerobic zone (2) were kept away from to low oxygen district (5) bottom is equipped with mixed liquid backwash pump (8), the output of mixed liquid backwash pump (8) is connected with anoxic zone (3) through mixed liquid back flow (9), one side upper portion that sewage treatment pond (1) is close to low oxygen district (5) is equipped with outlet pipe (10) of access low oxygen district (5), the inside bottom in aerobic zone (4) and low oxygen district (5) all is equipped with aeration facility (11).

2. The AAOO limit denitrification and dephosphorization treatment system according to claim 1, wherein: the anaerobic zone (2) is communicated with the anoxic zone (3) through a water outlet at the bottom, the anoxic zone (3) is communicated with the aerobic zone (4) through a water outlet at the upper part, and the water outlet at the bottom of the aerobic zone (4) is communicated with the hypoxia zone (5).

3. The AAOO limit denitrification and dephosphorization treatment system of claim 1, wherein: the main functions of the aerobic zone (4) are nitration reaction, internal carbon source accumulation and aerobic phosphorus uptake, the nitration reaction rate is lower than that of the internal carbon source accumulation and the aerobic phosphorus uptake, and the dissolved oxygen in the aerobic zone (4) is maintained at more than 2.0 mg/L.

4. The AAOO limit denitrification and dephosphorization treating system according to claim 1, the method is characterized in that: the low oxygen zone (5) utilizes nitrification reaction of the aerobic zone (4) to generate nitrate nitrogen as combined oxygen, consumes accumulated internal carbon source to carry out denitrification and dephosphorization reaction, the ratio of the volume of the low oxygen zone (5) to the phosphorus absorption volume of the aerobic zone (4) is 2-3:1, the dissolved oxygen in the aerobic zone (4) is maintained above 2.0mg/L, and the dissolved oxygen in the low oxygen zone (5) is maintained below 1.0 mg/L.

5. The AAOO limit denitrification and dephosphorization treatment system according to claim 1, wherein: the aeration facilities (11) are provided with air adjusting valves, the aeration facilities (11) are arranged in the aerobic zone (4) in a manner of encryption, and the density of the aeration facilities (11) in the low-oxygen zone (5) is lower than that of the aeration facilities (11) in the aerobic zone (4).

6. The AAOO limit denitrification and dephosphorization treatment system of claim 1, wherein: stirring facilities are arranged in the anaerobic zone (2) and the anoxic zone (3), the dissolved oxygen in the anaerobic zone (2) is controlled to be below 0.2mg/L, and the dissolved oxygen in the anoxic zone (3) is controlled to be below 0.5 mg/L.

7. The AAOO limit denitrification and dephosphorization treatment system according to claim 1, wherein: the one end that sewage treatment pond (1) was kept away from in outlet pipe (10) is connected with two and sinks the pond, two mud in settling the pond backward flow to anaerobic zone (2) and mix with intaking, and the mud reflux ratio control is 70% ~ 100%, mixed liquid backwash pump (8) are passed through in low oxygen district (5), and the liquid is nitrified to anoxic zone (3) in the backward flow, and the reflux ratio control of nitrifying the liquid is 200% ~ 300%.