MBR wastewater treatment system with deep denitrification and dephosphorization functions

A sewage treatment system and deep denitrification technology, applied in the field of MBR sewage treatment system, can solve the problems of high energy consumption of aerobic MBR operation and release of total nitrogen, so as to avoid the increase of effluent TN, alleviate slow membrane pollution, and improve the quality of effluent Effect

Active Publication Date: 2019-01-22
BEIJING ORIGINWATER TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of high energy consumption and total nitrogen release of traditional aerobic MBR, and provide a sewage treatment system that strengthe

Method used

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  • MBR wastewater treatment system with deep denitrification and dephosphorization functions

Examples

Experimental program
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Effect test

Example Embodiment

[0032] Example 1

[0033] Such as figure 1 The system shown includes the anaerobic tank 1, the front anoxic tank 2, the aerobic tank 3, the rear anoxic tank 4 and the membrane tank 5 connected in sequence, and the anaerobic tank 1, the front anoxic tank 2 and the post anoxic tank A stirring device 6 is respectively arranged in the tank 4, an aeration device 7 is arranged in the aerobic tank 3, and a membrane assembly device 8 is arranged in the membrane tank 5.

[0034] The membrane unit 8 realizes horizontal reciprocating movement by setting the tie rod connected with the membrane unit and the motor 9. The reciprocating movement of the membrane unit can alleviate membrane pollution and avoid installing aeration device in the membrane tank 5, thereby reducing the dissolution in the membrane tank. Oxygen concentration.

[0035] Membrane tank 5 and anaerobic tank 1 are provided with 1# sludge mixed liquid return pipe 10, and the 1# sludge mixed liquid return pipe 10 is provided with ...

Example Embodiment

[0043] Example 2

[0044] During operation, the influent COD concentration is 150~200mg / L, the TN concentration is 30~35mg / L, the TP concentration is 3~5mg / L, the ammonia nitrogen concentration is about 30mg / L, and the TP concentration reaches 10mg / L, a small amount of nitrate nitrogen returned by the membrane tank is also removed by denitrification. The front anoxic tank is used as the main denitrification and denitrification unit. The carbon source in the raw sewage and the nitrate nitrogen returned from the back anoxic tank are removed under the action of denitrifying bacteria. The nitrate in the front anoxic tank can be ensured by controlling the return flow. Nitrogen is sufficient to ensure full utilization of the original sewage carbon source. Then the mixed liquid enters the aerobic unit, the dissolved oxygen concentration of the aerobic pool can reach 0.5mg / L, the nitrifying bacteria use oxygen to completely oxidize the ammonia nitrogen in the raw sewage to nitrate nitro...

Example Embodiment

[0045] Example 3

[0046] The influent COD concentration is 150~200mg / L, the TN concentration is 30~35mg / L, the TP concentration is 3~5mg / L, the ammonia nitrogen concentration is about 30mg / L, the sewage passes through the anaerobic, pre-anoxic and aerobic unit After the action, the concentration of nitrate nitrogen flowing into the post anoxic tank is about 5~7mg / L. In order to achieve a higher effluent water quality goal, the external carbon source dosing pump of the post anoxic tank is turned on to control the reasonable dosage and further denitrification. The effect is to remove the nitrate nitrogen in the back anoxic tank and increase the backflow flow of the back anoxic tank to the front anoxic tank to ensure the nitrate nitrogen concentration in the front anoxic tank. The removal concentration of TN of each biochemical unit is 1~2, 16~18, 0~1, 11~13, 2~3mg / L, and the removal amount of ΔTN is about 35mg / L, and the TN removal load of the post anoxic tank increases Up to 30~...

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Abstract

The invention provides an MBR wastewater treatment system with deep denitrification and dephosphorization functions. The MBR wastewater treatment system sequentially comprises an anaerobic pool, a front anoxic pool, an aerobic pool, a rear anoxic pool and a membrane pool. The membrane pool does not contain an aeration part, a membrane set device realizes reciprocating motion through a mechanical transmission device, thus the membrane pollution problem is effectively solved, MBR process aeration energy consumption is further reduced, and the situation that the content of water outlet total nitrogen is increased due to excessive oxidation of sludge is further avoided. Through improvement for the membrane pool, the membrane pool directly returns a flow to the anaerobic pool, a process flow return form is simplified, and meanwhile, the situation that the biological dephosphorization effect is affected by flow return of DO and excessive nitrate nitrogen is further avoided. Through partitionaeration, the content of the DO of the control tail end of the aerobic pool is less than 0.1 mg/L, and the denitrification effect of the rear anoxic pool is improved, a flow return point and a rear dosing point are arranged at a middle section in the rear anoxic pool, thus denitrification of an internal source and an external source can be realized simultaneously, the denitrification cost is reduced, and when a carbon source is added externally, it can be ensured that the content of the water outlet total nitrogen is less than 1 mg/L. The MBR wastewater treatment system is used for municipalwastewater treatment and can realize earth surface IV-type water outlet when the carbon source is not added externally, wherein the content of TN is less than 5 mg/L, and the content of TP is less than 0.2 mg/L.

Description

【Technical field】 [0001] The invention relates to an MBR sewage treatment system capable of deep denitrification and phosphorus removal, and an operation method of the sewage treatment system. 【Background technique】 [0002] The high concentration of nitrogen and phosphorus pollutants in water bodies is the main cause of eutrophication in water bodies. Existing sewage treatment plant discharge standards (TN<15mg / L, TP<0.5mg / L) make the sewage discharge still cause a large burden on the water environment, and it is necessary to further improve the discharge water requirements of sewage treatment plants to alleviate water environmental pollution. In order to meet higher water quality requirements, sewage treatment plants usually add excessive carbon sources and phosphorus removal agents, which will inevitably increase the cost of sewage treatment, thus making it a technical upgrade for traditional sewage treatment plants to maintain economic efficiency while deeply remov...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F3/12C02F101/16
CPCC02F3/1268C02F3/30C02F3/308C02F2209/08C02F2209/14C02F2209/16C02F2209/22C02F2301/046Y02W10/10
Inventor 陈春生张朋川薛涛俞开昌黄霞戴日成贾海涛孙大阳
Owner BEIJING ORIGINWATER TECH CO LTD
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