AOA biological denitrification integrated equipment

Abstract

The utility model discloses AOA biological denitrification integrated equipment which is provided with a standard container shell, an air supply assembly, a sludge backflow assembly and a PLC automatic control unit, and the standard container shell is sequentially provided with an anaerobic tank section, an aerobic tank section, an anoxic tank section, a secondary sedimentation tank section and an equipment room section. The design of the system is based on an AOA (anaerobic-aerobic-anoxic) process and post denitrification, and meanwhile, the retention time of each section is controlled at the ratio of anaerobic: aerobic: anoxic: secondary sedimentation tank of 1: 1: 2: 1, so that the whole process fully utilizes a carbon source in inlet water for denitrification, the system has the advantage of high total nitrogen removal rate, the outlet water is stable and reaches the standard, and due to the reduction of the use of a carbon source medicament, the cost is reduced. Therefore, the operation cost is saved, and the purposes of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] This utility model specifically relates to an integrated AOA biological denitrification device. Background Technology

[0002] In traditional pre-denitrification processes (such as AO and A2O), the denitrification efficiency is limited by the internal reflux ratio. If the internal reflux ratio is too small, the denitrification efficiency will decrease; while if the internal reflux ratio is too large, although the denitrification efficiency will only increase to a limited extent, the power cost of supporting the nitrification liquor reflux will be very high.

[0003] In contrast, post-denitrification processes (such as OA) are not limited by the internal circulation ratio when there is sufficient carbon source, and theoretically can achieve complete denitrification. However, because the aerobic tank is located upstream, the carbon source in the influent is consumed in the aerobic stage, resulting in insufficient carbon source available in the anoxic stage. This leads to high consumption of carbon source reagents, high sludge production, and high operating costs. Utility Model Content

[0004] The purpose of this invention is to provide an integrated AOA biological denitrification device.

[0005] The technical solution of this utility model is as follows:

[0006] An integrated AOA biological nitrogen removal device comprises a standard container shell, an air supply assembly, a sludge return assembly, and a PLC automatic control unit.

[0007] The standard container shell sequentially comprises an anaerobic tank section, an aerobic tank section, an anoxic tank section, a secondary sedimentation tank section, and an equipment room section. The effective volume ratio of the internal cavities of the anaerobic tank section, aerobic tank section, anoxic tank section, and secondary sedimentation tank section is 1:1:2:1. The anaerobic tank section and the aerobic tank section are separated by a first partition, the aerobic tank section and the anoxic tank section are separated by a second partition, and the anoxic tank section and the secondary sedimentation tank section are separated by a third partition. The secondary sedimentation tank section and the product water tank section are separated by a fourth partition; the first partition is equipped with an anaerobic tank overflow channel to guide the liquid in the inner cavity of the anaerobic tank section to the inner cavity of the aerobic tank section; the second partition is equipped with an aerobic tank overflow channel to guide the liquid in the inner cavity of the aerobic tank section to the inner cavity of the anoxic tank section; the third partition is equipped with a secondary sedimentation tank inlet pipe to send the liquid in the anoxic tank section into the inner cavity of the secondary sedimentation tank section.

[0008] The anaerobic tank section includes an anaerobic tank inlet pipe, an anaerobic tank outlet pipe, and an anaerobic tank propeller.

[0009] The aerobic tank section has an aerobic tank aeration mechanism;

[0010] The anoxic tank section is equipped with a dual anoxic tank flow promoter;

[0011] The secondary sedimentation tank section has an outlet trough for the primary and secondary sedimentation tanks at the top and a sludge collection hopper and a sludge collection pipe for the primary and secondary sedimentation tanks at the bottom.

[0012] The air supply assembly includes a blower and an air main pipe, the air outlet of which is connected to the aeration mechanism of the aerobic tank through the air main pipe.

[0013] The sludge return assembly includes a sludge return pump, an anaerobic tank sludge return pipe, and an anoxic tank sludge return pipe. The inlet of the sludge return pump is connected to the outlet of the sludge collection pipe of the secondary sedimentation tank. The secondary sedimentation tank section is connected to the anaerobic tank section in sequence through the sludge collection pipe of the secondary sedimentation tank, the sludge return pump, and the sludge return pipe of the anaerobic tank, so as to return the sludge in the secondary sedimentation tank section to the anaerobic tank section. At the same time, the secondary sedimentation tank section is connected to the anoxic tank section in sequence through the sludge collection pipe of the secondary sedimentation tank, the sludge return pump, and the sludge return pipe of the anoxic tank, so as to return the sludge in the secondary sedimentation tank section to the anoxic tank section.

[0014] The aforementioned blower, sludge return pump, and PLC automatic control unit are all installed in the equipment room section. The PLC automatic control unit is electrically connected to the aforementioned blower, sludge return pump, anaerobic tank propeller, and anoxic tank propeller.

[0015] In a preferred embodiment of this utility model, within the anaerobic tank section, the inlet end of the anaerobic tank inlet pipe is located at the lower part of the side wall, and the outlet end is located at the upper part of the inner cavity of the anaerobic tank section on the side away from the first partition; the anaerobic tank vent pipe is located at the lower end of the side wall; and the anaerobic tank propeller is located at the lower part of the inner cavity of the anaerobic tank section on the side away from the first partition.

[0016] In a preferred embodiment of the present invention, the aeration mechanism is located in the lower part of the inner cavity of the aerobic tank section.

[0017] In a preferred embodiment of this utility model, within the anoxic pool section, the two anoxic pool propellers are located in the lower part of the inner cavity of the anoxic pool section and are relatively staggered.

[0018] In a preferred embodiment of this utility model, within the secondary sedimentation tank section, the inlet end of the secondary sedimentation tank sludge collection pipe is directly opposite the bottom of the secondary sedimentation tank sludge collection hopper.

[0019] The beneficial effects of this utility model are:

[0020] 1. The design of this utility model is based on the AOA (anaerobic-aerobic-anoxic) process with post-denitrification. The retention time of each section is controlled by the effective volume ratio of the inner cavity of each section: anaerobic:aerobic:anoxic:secondary sedimentation tank = 1:1:2:1. This allows the process to make full use of the carbon source in the influent for denitrification, which has the advantage of high total nitrogen removal rate. Its effluent is stable and meets the standards. Furthermore, due to the reduction in the use of carbon source agents, it saves operating costs and achieves the goal of energy conservation and emission reduction.

[0021] 2. This utility model has a simple structure, is economical and practical, and is easy to promote. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a side view of the internal structure of this utility model.

[0024] Figure 3 This is a top view of the internal structure of this utility model. Detailed Implementation

[0025] The technical solution of this utility model will be further explained and described below with reference to specific embodiments and accompanying drawings.

[0026] like Figures 1 to 3 As shown, an integrated AOA biological denitrification device has a standard container shell 1, an air supply component 2, a sludge return component 3, and a PLC automatic control unit 4.

[0027] The standard container shell 1 sequentially comprises an anaerobic tank section 11, an aerobic tank section 12, an anoxic tank section 13, a secondary sedimentation tank section 14, and an equipment room section 15. The effective volume ratio of the inner cavities of the anaerobic tank section 11, aerobic tank section 12, anoxic tank section 13, and secondary sedimentation tank section 14 is 1:1:2:1. The anaerobic tank section 11 and aerobic tank section 12 are separated by a first partition 101, the aerobic tank section 12 and anoxic tank section 13 are separated by a second partition 102, and the anoxic tank section 13 and secondary sedimentation tank section 14 are separated by a third partition 103. Section 14 and the product water tank section are separated by a fourth partition 104; the first partition 101 is provided with an anaerobic tank water passage 110 to guide the liquid in the inner cavity of the anaerobic tank section 11 to the inner cavity of the aerobic tank section 12; the second partition 102 is provided with an aerobic tank water passage 120 to guide the liquid in the inner cavity of the aerobic tank section 12 to the inner cavity of the anoxic tank section 13; the third partition 103 is provided with a secondary sedimentation tank inlet pipe 140 to send the liquid in the anoxic tank section 13 into the inner cavity of the secondary sedimentation tank section 14; the standard container shell 1 facilitates transportation and hoisting, and is more conducive to product promotion.

[0028] The anaerobic tank section 11 includes an anaerobic tank inlet pipe 111, an anaerobic tank vent pipe 112, and an anaerobic tank propeller 113. The inlet end of the anaerobic tank inlet pipe 111 is located at the lower part of the side wall, and the outlet end is located at the upper part of the inner cavity of the anaerobic tank section 11 on the side away from the first partition 101. The anaerobic tank vent pipe 112 is located at the lower end of the side wall, and the anaerobic tank propeller 113 is located at the lower part of the inner cavity of the anaerobic tank section 11 on the side away from the first partition 101.

[0029] The aerobic tank section 12 has an aerobic tank aeration mechanism 121, which is located in the lower part of the inner cavity of the aerobic tank section 12.

[0030] The anoxic tank section 13 has two anoxic tank propellers 131, which are located in the lower part of the inner cavity of the anoxic tank section 13 and are relatively staggered.

[0031] The secondary sedimentation tank section 14 has an upper part with a primary and secondary sedimentation tank outlet trough 141, and a lower part with a primary and secondary sedimentation tank sludge collection hopper 142 and a primary and secondary sedimentation tank sludge collection pipe 143. The inlet end of the secondary sedimentation tank sludge collection pipe 143 is directly opposite the bottom of the secondary sedimentation tank sludge collection hopper 142.

[0032] The air supply assembly 2 includes a blower 21 and an air main pipe 22. The air outlet of the blower 21 is connected to the aeration mechanism 121 of the aerobic tank through the air main pipe 22.

[0033] The sludge return assembly 3 includes a sludge return pump 31, an anaerobic tank sludge return pipe 32, and an anoxic tank sludge return pipe 33. The inlet of the sludge return pump 31 is connected to the outlet end of the sludge collection pipe 143 of the secondary sedimentation tank. The secondary sedimentation tank section 14 is connected to the anaerobic tank section 11 in sequence through the sludge collection pipe 143, the sludge return pump 31, and the anaerobic tank sludge return pipe 32, so as to return the sludge in the secondary sedimentation tank section 14 to the anaerobic tank section 11. At the same time, the secondary sedimentation tank section 14 is connected to the anoxic tank section 13 in sequence through the sludge collection pipe 143, the sludge return pump 31, and the anoxic tank sludge return pipe 33, so as to return the sludge in the secondary sedimentation tank section 14 to the anoxic tank section 13.

[0034] The blower 21, sludge return pump 31 and PLC automatic control unit 4 are all installed in the equipment room section 15. The PLC automatic control unit 4 is electrically connected to the blower 21, sludge return pump 31, anaerobic tank propeller 113 and anoxic tank propeller 131.

[0035] Wastewater enters from the anaerobic tank inlet pipe 111. The sludge in the secondary sedimentation tank section 14 is pressurized by the sludge return pump 31 and returned to the anaerobic tank section 11 through the anaerobic tank sludge return pipe 32. After being fully mixed and stirred by the anaerobic tank propeller 113, the COD, ammonia nitrogen, total nitrogen and other substances in the wastewater are degraded. The treated sludge-water mixture enters the aerobic tank section 12 through the anaerobic tank overflow trough 110.

[0036] Wastewater and activated sludge flow from the anaerobic tank section 11 to the aerobic tank section 12. The blower 21 in the equipment room section 15 pressurizes the activated sludge with pressurized air via the aeration mechanism 121 in the aerobic tank, thus degrading substances such as COD and ammonia nitrogen in the wastewater. The treated sludge-water mixture then enters the anoxic tank section 13 via the aerobic tank overflow trough 120.

[0037] The sludge in the secondary sedimentation tank section 14 is pressurized by the sludge return pump 31 and returned to the anoxic tank section 13 through the anoxic tank sludge return pipe 33. After being fully mixed and stirred by the secondary anoxic tank propeller 131, the COD, ammonia nitrogen, total nitrogen and other substances in the wastewater are degraded. The treated sludge-water mixture enters the secondary sedimentation tank section 14 through the secondary sedimentation tank inlet pipe 140.

[0038] The mud-water mixture enters the secondary sedimentation tank section 14 through the secondary sedimentation tank inlet pipe 140. Under the action of gravity, mud and water are separated in the secondary sedimentation tank section 14, and the treated water is discharged through the secondary sedimentation tank outlet trough 141. The settled sludge collects in the secondary sedimentation tank sludge collection hopper 142, and the sludge is pumped back to the anaerobic tank section 11 and the anoxic tank section 13 by the sludge return pump 31 in the equipment room section 15 via the secondary sedimentation tank sludge collection pipe 143.

[0039] In summary, this invention is based on the AOA (anaerobic-aerobic-anoxic) process with post-denitrification. The retention time of each section is controlled by the effective volume ratio of the inner cavity of each section: anaerobic:aerobic:anoxic:secondary sedimentation tank = 1:1:2:1. This allows the process to fully utilize the carbon source in the influent for denitrification, resulting in a high total nitrogen removal rate. The effluent is stable and meets the standards. Furthermore, by reducing the use of carbon source agents, operating costs are saved, achieving the goal of energy conservation and emission reduction.

[0040] The above description is only a preferred embodiment of the present utility model, and therefore cannot be used to limit the scope of the present utility model. All equivalent changes and modifications made in accordance with the scope of the present utility model patent and the contents of the specification should still fall within the scope of the present utility model.

Claims

1. An AOA biological denitrification integrated device, characterized in that: The utility model discloses a standard container shell, a gas supply assembly, a sludge backflow assembly and a PLC automatic control unit, The standard container shell has an anaerobic tank section, an aerobic tank section, an anoxic tank section, a secondary sedimentation tank section and a equipment room section in sequence, the effective volume ratio of the inner cavities of the anaerobic tank section, the aerobic tank section, the anoxic tank section and the secondary sedimentation tank section is 1:1:2:1, the anaerobic tank section and the aerobic tank section are separated by a first partition plate, the aerobic tank section and the anoxic tank section are separated by a second partition plate, the anoxic tank section and the secondary sedimentation tank section are separated by a third partition plate, and the secondary sedimentation tank section and the water production tank section are separated by a fourth partition plate; the first partition plate is provided with an anaerobic tank water passing groove for guiding the liquid in the inner cavity of the anaerobic tank section to the inner cavity of the aerobic tank section; the second partition plate is provided with an aerobic tank water passing groove for guiding the liquid in the inner cavity of the aerobic tank section to the inner cavity of the anoxic tank section; and the third partition plate is provided with a secondary sedimentation tank water inlet pipe for feeding the liquid in the anoxic tank section into the inner cavity of the secondary sedimentation tank section. The anaerobic tank section is provided with an anaerobic tank water inlet pipe, an anaerobic tank vent pipe and an anaerobic tank flow inducer. The aerobic tank section is provided with an aerobic tank aeration mechanism. The anoxic tank section is provided with two anoxic tank flow inducers. The secondary sedimentation tank section has a secondary sedimentation tank water outlet groove in the upper part and a secondary sedimentation tank sludge collecting hopper and a secondary sedimentation tank sludge collecting pipe in the lower part. The gas supply assembly comprises a blower and an air main pipe, and the air outlet of the blower is connected to the aerobic tank aeration mechanism through the air main pipe. The sludge backflow assembly comprises a sludge backflow pump, an anaerobic tank sludge backflow pipe and an anoxic tank sludge backflow pipe, the inlet of the sludge backflow pump is connected to the outlet end of the secondary sedimentation tank sludge collecting pipe, the secondary sedimentation tank section is connected to the anaerobic tank section through the secondary sedimentation tank sludge collecting pipe, the sludge backflow pump and the anaerobic tank sludge backflow pipe in sequence, so as to backflow the sludge in the secondary sedimentation tank section to the anaerobic tank section, and the secondary sedimentation tank section is connected to the anoxic tank section through the secondary sedimentation tank sludge collecting pipe, the sludge backflow pump and the anoxic tank sludge backflow pipe in sequence, so as to backflow the sludge in the secondary sedimentation tank section to the anoxic tank section.

2. The AOA biological denitrification integrated device according to claim 1, characterized in that: The blower, the sludge backflow pump and the PLC automatic control unit are all arranged in the equipment room section, and the PLC automatic control unit is electrically connected with the blower, the sludge backflow pump, the anaerobic tank flow inducer and the two anoxic tank flow inducers.

3. The integrated AOA biological denitrification device according to claim 1, characterized in that: In the anaerobic tank section, the water inlet end of the anaerobic tank water inlet pipe is arranged at the lower part of the side wall, and the water outlet end is arranged at the upper part of the side of the inner cavity of the anaerobic tank section away from the first partition plate; the anaerobic tank vent pipe is arranged at the lower end of the side wall; and the anaerobic tank flow inducer is arranged at the lower part of the side of the inner cavity of the anaerobic tank section away from the first partition plate.

4. The integrated AOA biological denitrification device according to claim 1, characterized in that: In the aerobic tank section, the aerobic tank aeration mechanism is arranged at the lower part of the inner cavity of the aerobic tank section.

5. The integrated AOA biological denitrification device according to claim 1, characterized in that: In the anoxic tank section, the two anoxic tank flow inducers are arranged at the lower part of the inner cavity of the anoxic tank section and are oppositely arranged. In the secondary sedimentation tank section, the inlet end of the secondary sedimentation tank sludge collecting pipe is opposite to the bottom of the secondary sedimentation tank sludge collecting hopper.

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