A multi-stage anoxic-aerobic process

Abstract

A multi-stage anoxic-aerobic process method adopts a multi-dimensional way of water inlet including lateral, vertical and other directions; activated sludge is added internally to allow aerobic microorganisms and nitrifying bacteria to grow on the filler; through the optimization and adjustment of the water inlet direction and the aeration intensity, a multi-stage anoxic / aerobic reaction zone is formed laterally, and can be relatively divided into anaerobic / anoxic / aerobic reaction zones from bottom to top vertically. The multi-stage anoxic-aerobic processor that implements the method includes: a processor cavity, the cavity is provided with lateral and vertical water distribution areas, and an aerobic filler module; the aerobic filler module is arranged in the middle and upper part of the cavity; the effluent is collected by the water collection area and then discharged or enters the next level of treatment system. The upward flow of sewage brings about a better mixing effect, and its raw water provides a carbon source for the denitrification reaction in the anoxic zone, thereby improving the efficiency of biological denitrification. The multi-stage anoxic-aerobic process and processor are integrated devices, which are composed of modular units inside, which are easy to install and disassemble.

Description

Technical Field

[0001] The invention belongs to the field of water pollution control and relates to a multi-stage anoxic-aerobic process method based on a multi-directional water inlet mode. Background Art

[0002] With the acceleration of urbanization and the rapid development of the economy, the number of urban populations has continued to increase, and the amount of urban sewage discharged has also increased rapidly, which has greatly tested the treatment capacity of urban sewage. At present, the processes for biological treatment of urban sewage are very mature, mainly including activated sludge method and biofilm method. However, traditional sewage biological treatment processes often require the setting of multiple reaction zones in series, and anaerobic, anoxic and aerobic processes are carried out in different reaction tanks respectively, and then the removal effect of nitrogen and phosphorus is improved by increasing the internal circulation. Its infrastructure and energy consumption are high, and the operation and management are relatively complicated. At the same time, the biomass content of the influent of sewage treatment plants is generally low, and many influent CODs are lower than 200 mg / L, resulting in insufficient carbon sources for biological denitrification and phosphorus removal, and the operation cost of artificial addition is high. Although the utilization rate of carbon sources in raw water can be improved by segmented water inlet, the distribution of influent is not easy to control, which can easily cause unstable effluent COD.

[0003] Therefore, how to provide a processor device with low total investment, low operating cost, easy operation and management, good denitrification and phosphorus removal effect and good aesthetics is one of the technical problems that technicians urgently need to solve. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention aims to provide a multi-stage anoxic-aerobic process method based on a multi-directional water inlet mode.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] Adopt relevant coupling technology, including new technical solutions in method, processor structure and process combination.

[0007] A multi-stage anoxic-aerobic process method adopts multi-dimensional water inlet including lateral, vertical and other directions; activated sludge is added internally to allow aerobic microorganisms and nitrifying bacteria to grow on the filler; through the optimization adjustment of the water inlet direction and the aeration intensity, multi-stage anoxic / aerobic reaction zones are formed in the lateral direction, and can be relatively divided into anaerobic / anoxic / aerobic reaction zones from bottom to top along the vertical direction.

[0008] Furthermore, aerobic functional filler modules are arranged in the middle and upper sections to perform aeration inside.

[0009] The high-concentration nitrified liquid produced in the aerobic zone can directly enter the next-level anoxic zone laterally with the plug flow, and can also settle to the lower anoxic zone due to gravity.

[0010] The upward flow of sewage is promoted to promote mixing, and the raw water provides a carbon source for the denitrification reaction in the anoxic zone to improve the efficiency of biological denitrification.

[0011] The water inlet distribution is adjusted according to the properties of the sewage to be treated. Preferably, the distribution ratio of lateral water inlet to vertical water inlet is (4:6) to (7:3).

[0012] Preferably, the lateral water distribution area accounts for 1 / 3 to 3 / 4 of the total lateral area, and the vertical water distribution area accounts for 1 / 4 to 3 / 4 of the total bottom area.

[0013] The vertical space between the water distribution surface of the vertical water distribution and the bottom of the cavity is the sludge gravity concentration and anaerobic digestion area. The vertical minimum height setting needs to ensure that the water distribution point is not easily covered by sludge and thus caused by blockage, and the vertical distance from the bottom needs to ensure sufficient sludge storage space without affecting the vertical functional distribution.

[0014] Preferably, the vertical water distribution point is 0.3 to 0.8 m above the bottom.

[0015] The vertical water distribution sets a certain outlet water head to increase the upward flow trend of sewage and improve the mixing effect of sewage in the anoxic zone at the lower part of the cavity, while avoiding damage to the environment of the anoxic zone and the aerobic zone caused by excessive outlet water head.

[0016] Preferably, the water outlet head is 0.2-1.0 m.

[0017] The aerobic filler module adopts a vertical structure, is arranged in the middle and upper part of the cavity, remains suspended in the cavity, and is arranged as an independent monomer.

[0018] The distance between the top surface of the filler module and the water surface in the cavity is 0 to 1.0 m; the height of the monomer is not less than 0.5 m, and the distance between each monomer is 0 to 1.0 m.

[0019] The aerobic filler module is filled with a microorganism attachment base and is provided by a combination of one or two of a polymer elastic filler (formaldehyde fiber ring and formaldehyde fiber bundle) and a suspended ball filler.

[0020] Preferably, the aeration volume of the aerobic functional filler modules with different monomers is controllable, and the internal dissolved oxygen concentration is 1 to 3 mg / L.

[0021] The treatment system is configured as a deep pool structure with an effective water depth of 1.0 to 2.5 m and a volume of 1 to 3 times the amount of water treated in one day.

[0022] Floating plants are planted on the water surface in the treatment system to purify sewage and absorb odors produced by biological reactions.

[0023] The floating plants are one or more of water spinach, water celery and water hyacinth.

[0024] Furthermore, the present invention also includes: a processor cavity, the cavity is provided with lateral and vertical water distribution areas, and an aerobic filler module; the aerobic filler module is arranged in the upper middle part of the cavity; the effluent is collected by the water collection area and then discharged or enters the next level treatment system.

[0025] By optimizing the water inlet direction and aeration intensity, a multi-stage anoxic / aerobic reaction zone is formed on the side of the cavity, which can be relatively divided into anaerobic / anoxic / aerobic reaction zones from bottom to top vertically; the aerobic filler module is fixed to the load-bearing beam by a traction rope, and an aeration head is arranged inside the filler module.

[0026] The processor cavity adopts an integrated frame structure.

[0027] Preferably, the processor adopts a multi-directional water inlet method, not limited to lateral and vertical, and the ratio of lateral water inlet to vertical water inlet is (4:6) to (7:3).

[0028] Preferably, the lateral water distribution area of ​​the processor accounts for 1 / 3 to 3 / 4 of the total lateral area, and the vertical water distribution area accounts for 1 / 4 to 3 / 4 of the total bottom area.

[0029] Preferably, the vertical water distribution point of the processor is 0.3 to 0.8 m above the bottom, and the vertical space between the water distribution surface and the bottom of the cavity is a sludge gravity concentration and anaerobic digestion zone.

[0030] Preferably, the processor is provided with a certain outlet head for vertical water distribution, the value of which is 0.2 to 1.0 m, so as to increase the upward flow tendency of sewage and improve the mixing effect of sewage in the anoxic zone at the lower part of the cavity.

[0031] Preferably, the aerobic filler module of the processor adopts a vertical structure and is arranged in the middle and upper part of the cavity, and the distance between the top surface of the filler module and the water surface in the cavity is 0 to 1.0 m.

[0032] Preferably, the processor aerobic filler module is arranged as an independent unit, the unit height is not less than 0.5m, and the distance between each unit is 0-1.0m.

[0033] Preferably, the aerobic filler module of the processor is connected to a load-bearing beam on the water surface of the cavity through a traction rope, the outer circle of the load-bearing beam wraps the floating body, and the traction rope is retracted and extended up and down to adjust the vertical position of the filler module.

[0034] Preferably, the aerobic filler module is filled with a microbial attachment base, which is provided by a combination of one or two of a polymer elastic filler (formaldehyde fiber ring and formaldehyde fiber bundle) and a suspended ball filler.

[0035] Preferably, the aerobic filler module is connected to an aeration pipe through an aerator to enter the filler module for internal aeration, the aeration amount of different monomer filler modules is controllable, and the internal dissolved oxygen concentration is 1-3 mg / L.

[0036] Preferably, the processor chamber is configured as a deep pool structure with an effective water depth of 1.0 to 2.5 m and a volume of 1 to 3 times the amount of water processed per day, ensuring that the environment of each lateral and vertical anoxic / aerobic reaction zone is stable.

[0037] Preferably, floating plants are planted on the water surface in the processor, and the floating plants are one or more of water spinach, water celery, and polyanthus, etc. The plants purify sewage and absorb odors generated by biological reactions.

[0038] Preferably, the processor is not provided with a nitrification liquid reflux system, and the high-concentration nitrification liquid produced in the aerobic zone directly enters the next-stage anoxic zone laterally with the push flow, and can also settle to the lower anoxic zone with gravity.

[0039] Due to the adoption of the above technical scheme, the beneficial effects obtained by the present invention include at least: a multi-stage anoxic-aerobic process method based on a multi-directional water inlet mode of the present invention, which forms a multi-stage anoxic / aerobic reaction zone in the lateral direction by optimizing the water inlet direction and the aeration intensity, and can be relatively divided into anaerobic / anoxic / aerobic reaction zones from bottom to top vertically. Compared with the traditional biological denitrification treatment, the processor cancels the nitrification liquid reflux system. The high-concentration nitrification liquid produced in the aerobic zone directly enters the next-level anoxic zone with the plug flow in the lateral direction on the one hand, and can also settle to the lower anoxic zone with gravity on the other hand. At the same time, the upward flow of sewage brings a better mixing effect, and its raw water provides a carbon source for the denitrification reaction in the anoxic zone, thereby improving the efficiency of biological denitrification. The processor is an integrated device, which is composed of modular units inside, which is easy to install and disassemble. When the sewage passes through the processor, pollutants such as nitrogen and phosphorus are effectively reduced under the joint purification action of activated sludge and biofilm. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural cross-sectional view of a preferred embodiment of a multi-stage anoxic-aerobic process method based on a multi-directional water inlet mode of the present invention.

[0041] Figure 2 It is a functional zoning diagram of a preferred embodiment of a multi-stage anoxic-aerobic process method based on a multi-directional water inlet mode of the present invention.

[0042] Reference numerals: 1-processor chamber; 2-lateral water distribution area; 3-vertical water distribution area; 4-aerobic filler module; 5-aeration point; 6-traction rope; 7-aerator; 8-aeration pipe; 9-load-bearing beam; 10-floating plants; 11-water collection area;

[0043] A1 ~ anaerobic zone; A2 ~ anoxic zone; O ~ aerobic zone. DETAILED DESCRIPTION

[0044] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0045] See also Figure 1 , the embodiment of the present invention includes:

[0046] A multi-stage anoxic-aerobic process method based on a multi-directional water inlet mode comprises: a processor chamber 1 of an integrated frame structure, a lateral water distribution area 2, a vertical water distribution area 3, an aerobic filler module 4, an aeration point 5 inside the filler module, a traction rope 6, an aerator 7, an aeration pipe 8, a load-bearing beam 9, floating plants 10, and a water collection area 11.

[0047] The multi-directional water inlet of the processor is not limited to lateral and vertical. The water inlet distribution is adjusted and optimized according to the nature of the sewage to be treated. The ratio of lateral water inlet to vertical water inlet is (4:6) ~ (7:3); the distribution of lateral and vertical water inlet mainly depends on the amount of carbon source organic matter in the raw water to be treated. The water directly enters the anoxic zone vertically, so the organic matter in the raw water can be used as a carbon source for denitrification reaction to improve the denitrification efficiency. When the BOD / TKN in the raw water is <3, increase the vertical water inlet, and the ratio of lateral water inlet to vertical water inlet is 4:6. If the ratio continues to increase, the COD content of the effluent will increase, which is not conducive to meeting the water quality standards. When BOD / TKN>8, the maximum ratio of lateral water inlet to vertical water inlet shall not exceed 7:3, otherwise it will cause insufficient nitrification reaction.

[0048] The lateral water distribution area of ​​the processor accounts for 1 / 3 to 3 / 4 of the total lateral area, and the vertical water distribution area accounts for 1 / 4 to 3 / 4 of the total bottom area; the lateral and vertical water distribution areas are related to the water inflow. When the water inflow is less than 2 cubic meters / day, the lateral and vertical water distribution areas are 1 / 3 and 1 / 4 respectively. To ensure the rigidity and strength of the device, the lateral and vertical water distribution areas should not be greater than 3 / 4.

[0049] The vertical minimum height setting needs to ensure that the water distribution point is not easily covered by sludge, thereby causing blockage, and the vertical distance from the bottom needs to ensure sufficient sludge storage space without affecting the vertical functional distribution; preferably, the vertical water distribution point of the processor is 0.3 to 0.8m higher than the bottom distance, and the vertical space between the water distribution surface and the bottom of the cavity is the sludge gravity concentration and anaerobic digestion area.

[0050] A certain outlet head is set in the vertical water distribution area 3 of the processor. The outlet head is designed according to the pool depth. It is necessary to avoid excessive outlet head causing damage to the anoxic and aerobic zone environments. It is preferably 0.2 to 1.0 m to increase the upward flow trend of sewage and improve the mixing effect of sewage in the anoxic zone in the lower part of the cavity.

[0051] The aerobic filler module of the processor adopts a vertical structure and is arranged in the middle and upper part of the cavity. Preferably, the distance between the top surface of the filler module 4 and the water surface in the cavity is 0 to 1.0 m.

[0052] The processor aerobic filler module 4 is arranged as an independent unit. Preferably, the unit height is not less than 0.5m, and the distance between each unit is 0-1.0m.

[0053] The processor filler module 4 is connected and fixed to the load-bearing beam 9 through a traction rope 6. The aerobic filler module 4 is kept suspended in the water body. The traction rope 6 is retracted and released up and down to adjust the vertical position of the aerobic filler module 4.

[0054] The aerobic filler module 4 of the processor is filled with a microorganism attachment base, which is provided by a combination of one or two of a polymer elastic filler (formaldehyde fiber ring and formaldehyde fiber bundle) and a suspended ball filler.

[0055] The aerobic filler module 4 is connected to the aeration pipe 8 through the aerator 7 to enter the internal aeration point 5 of the filler module. The aeration amount of different monomer aerobic filler modules 4 is controllable. Preferably, the internal dissolved oxygen concentration is 1-3 mg / L.

[0056] The processor chamber 1 is configured as a deep pool structure to ensure that the environment of each anaerobic / oxic reaction zone in the horizontal and vertical directions is stable. Preferably, the effective water depth is 1.0 to 2.5 m, and the volume is 1 to 3 times the amount of water processed per day.

[0057] Floating plants 10 are planted on the sewage surface in the treatment device, preferably one or more of water spinach, water celery, and polyanthus, so that the sewage is directly purified by the plants and the odor generated by the biological reaction is absorbed by the plants.

[0058] See also Figure 2 , the embodiment of the present invention includes:

[0059] A multi-stage anoxic-aerobic process method based on a multi-directional water inlet mode forms multi-stage anoxic / aerobic reaction zones laterally through the optimization adjustment of the water inlet direction and aeration intensity, and can be relatively divided into anaerobic / anoxic / aerobic reaction zones vertically from bottom to top.

[0060] Preferably, the lateral aerobic filler module area is the aerobic zone O, and the non-aerated zone is the relatively anoxic zone A2, which are continuously and discontinuously distributed along the push flow direction; the push flow direction is the flow direction along the water body, which is manifested as lateral flow in this embodiment.

[0061] Preferably, vertically from the bottom to the top, there are the anaerobic zone A1, the anoxic zone A2, and the aerobic zone O in sequence.

[0062] Preferably, the area from the bottom of the processor cavity to the vertical water distribution area is the anaerobic zone A1, which mainly performs sludge digestion and volume reduction treatment, the vertical anoxic zone A2 mainly performs denitrification and denitrification reactions, and the aerobic zone O in the middle and upper part mainly performs organic matter degradation and nitrification reactions.

[0063] Preferably, the processor is not provided with a nitrification liquid reflux system, and the high-concentration nitrification liquid produced in the aerobic zone O directly enters the next-stage anoxic zone A2 laterally with the push flow, and can also settle to the lower anoxic zone A1 with gravity.

[0064] This embodiment uses domestic sewage for testing. The length*width*height of the device is 1.9m*1.0m*1.0m, and the water inflow is 1.5m³ / d. The continuous test results show that the influent water quality COD is 120-240mg / L, TN is 45-70mg / L, and the system runs stably for 3 months at room temperature (14-25℃), and the average COD concentration of the system effluent is less than 40.92±5.06mg / L. The average TN concentration is less than 10.28±2.06mg / L.

[0065] In summary, the present invention discloses a multi-stage anoxic-aerobic process method based on a multi-directional water inlet method. The water inlet adopts a multi-dimensional method, not limited to lateral and vertical directions. A large amount of activated sludge is added internally. Aerobic functional filler modules are arranged in the upper and middle sections of the processor, and an aeration head is arranged inside to ensure that aerobic microorganisms and nitrifying bacteria grow on the filler. Through the optimization and adjustment of the water inlet direction and the aeration intensity, a multi-stage anoxic / aerobic reaction zone is formed laterally, and it can be relatively divided into anaerobic / anoxic / aerobic reaction zones from bottom to top vertically. Compared with traditional biological denitrification treatment, the processor cancels the nitrification liquid reflux system. The high-concentration nitrification liquid produced in the aerobic zone directly enters the next-level anoxic zone with the plug flow in the lateral direction on the one hand, and can also settle to the lower anoxic zone with gravity on the other hand. At the same time, the upward flow of sewage brings a better mixing effect, and its raw water provides a carbon source for the denitrification reaction in the anoxic zone, thereby improving the efficiency of biological denitrification. Through the above-mentioned method, the multi-stage anoxic-aerobic process method based on the multi-directional water inlet method of the present invention is an integrated device, which is internally composed of modular units and is easy to install and disassemble. When the sewage passes through the processor, pollutants such as nitrogen and phosphorus can be effectively reduced mainly under the joint action of activated sludge and biofilm. The effluent is collected in the catchment area and then directly discharged or enters the next-level treatment system.

[0066] The above-mentioned related explanations and descriptions of the embodiments are for the convenience of those skilled in the art to understand and apply the present invention. It is obvious that those familiar with the art can easily make various modifications to these contents and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above-mentioned related explanations and descriptions of the embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A multi-stage anoxic-aerobic process, characterized in that: The water is fed in multiple directions, including lateral, vertical and other directions. Activated sludge is added internally to allow aerobic microorganisms and nitrifying bacteria to grow on the filler. Through the optimization of the water inlet direction and aeration intensity, multi-stage anoxic / aerobic reaction zones are formed in the lateral direction, and the anaerobic / anoxic / aerobic reaction zones can be relatively divided from bottom to top vertically. It also includes: a processor cavity, the cavity is provided with lateral and vertical water distribution areas, and an aerobic filler module; the aerobic filler module is arranged in the middle and upper part of the cavity; the effluent is collected by the water collection area and then discharged or enters the next level treatment system; the aerobic filler module is fixed to the load-bearing beam by a traction rope; and / or, an aeration head is arranged inside the aerobic filler module; The water inflow distribution is adjusted according to the nature of the sewage to be treated, and the distribution ratio of lateral water inflow to vertical water inflow is (4:6) to (7:3); when the BOD / TKN in the raw water is <3, the vertical water inflow is increased, and the ratio of lateral water inflow to vertical water inflow is 4:

6. When BOD / TKN>8, the maximum ratio of lateral water inflow to vertical water inflow does not exceed 7:3; The high-concentration nitrified liquid produced in the aerobic zone can directly enter the next-level anoxic zone with the plug flow in the lateral direction, and can also settle to the lower anoxic zone with gravity; The vertical water distribution is provided with a certain outlet water head, which increases the upward flow trend of sewage and improves the mixing effect of sewage in the anoxic zone at the lower part of the cavity, while avoiding the damage to the environment of the anoxic zone and the aerobic zone caused by excessive outlet water head; The aerobic filler module adopts a vertical structure, is arranged in the middle and upper part of the cavity, and is kept suspended in the cavity to form an independent monomer. The distance between the top surface of the filler module and the water surface in the cavity is 0-1.0m; the height of the monomer is not less than 0.5m, and the distance between each monomer is 0-1.0m; the aerobic filler module is filled with microbial attachment base, which is composed of one or a combination of polymer elastic filler and suspended ball filler; the aeration volume of aerobic functional filler modules with different monomers is controllable, and the internal dissolved oxygen concentration is 1-3mg / L; The treatment system is set up as a deep pool structure with an effective water depth of 1.0 to 2.5m and a volume of 1 to 3 times the amount of water treated in one day. Floating plants are planted on the water surface in the treatment system to purify sewage and absorb odors produced by biological reactions.

2. The multi-stage anoxic-aerobic process according to claim 1, characterized in that: The lateral water distribution area accounts for 1 / 3 to 3 / 4 of the total lateral area, and the vertical water distribution area accounts for 1 / 4 to 3 / 4 of the total bottom area.

3. The multi-stage anoxic-aerobic process according to claim 1, characterized in that: The vertical space between the water distribution surface of the vertical water distribution and the bottom of the cavity is the sludge gravity concentration and anaerobic digestion area. The vertical minimum height setting needs to ensure that the water distribution point is not easily covered by sludge and caused blockage, and the vertical distance from the bottom needs to ensure sufficient sludge storage space without affecting the vertical functional distribution; the vertical water distribution point is 0.3 to 0.8m higher than the bottom.

4. The multi-stage anoxic-aerobic process according to claim 1, characterized in that: The water outlet head is 0.2-1.0m.

5. The multi-stage anoxic-aerobic process according to claim 1, characterized in that: The floating plants are one or more of water spinach, water celery and water hyacinth.

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