Multistage multipoint water inlet enhanced denitrification sewage treatment system and method

A multi-point water inflow and denitrification technology, applied in multi-stage water treatment, water/sewage multi-stage treatment, water/sewage treatment, etc., can solve problems such as increased treatment costs, inability to effectively reduce organic matter content, and lower effluent quality , to achieve the effect of saving treatment costs, avoiding the increase of effluent organic matter or total nitrogen, and ensuring stability

Pending Publication Date: 2021-02-19
河北先河正合环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the pre-denitrification process, incomplete denitrification occurs when the influent COD/TN2 Gas is discharged, and when the carbon source is excessi...

Method used

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  • Multistage multipoint water inlet enhanced denitrification sewage treatment system and method
  • Multistage multipoint water inlet enhanced denitrification sewage treatment system and method
  • Multistage multipoint water inlet enhanced denitrification sewage treatment system and method

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Embodiment 1

[0040] figure 1 As shown, it is a flow chart of a system for multi-stage and multi-point water inflow to strengthen denitrification treatment of sewage in a preferred embodiment of the present invention. The system includes an AAO biochemical treatment module 10 and an AO biochemical treatment module 20, wherein the AAO biochemical treatment module 10 is in front end, and the AO biochemical treatment module 20 is connected at the back end. The AAO biochemical treatment module 10 includes an anaerobic tank 11, a first anoxic tank 12 and a first aerobic tank 13 connected in sequence, and the AO biochemical treatment module 20 includes a second anoxic tank 21 and a second aerobic tank 22 connected in sequence .

[0041] The raw water is divided into at least two streams, which are treated by the grid and the regulating tank (adjusting the pH value to be close to neutral to adapt to microorganisms), wherein about 75-85% of the raw water of one stream enters the anaerobic pool of ...

Embodiment 2

[0048] The difference between this embodiment and Embodiment 1 is that on the basis of Embodiment 1, the AO biochemical treatment module 20 further includes a third anoxic pool 23 and a third aerobic pool 24 connected in sequence. In the present embodiment, the raw water is divided into three stocks, wherein one (65%) enters the anaerobic tank 11 of the AAO biochemical treatment module 10 after pretreatment, and the effluent treated by the anaerobic bacteria of the activated sludge in the anaerobic tank 11 enters The first anoxic pond 12, the effluent treated by denitrifying bacteria in the first anoxic pond 12 enters the first aerobic pond 13; The effluent treated by the middle nitrifying bacteria enters the second anoxic pool 21 of the AO biochemical treatment module 20 together, and the effluent treated by the denitrifying bacteria in the second anoxic pool 21 enters the second aerobic pool 22 and is treated by the nitrifying bacteria; wherein, The first aerobic tank 13 is ...

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Abstract

The invention relates to a multistage multipoint water inlet enhanced denitrification sewage treatment system which comprises an AAO biochemical treatment module and an AO biochemical treatment module. The AAO biochemical treatment module comprises an anaerobic tank, a first anoxic tank and a first aerobic tank; the AO biochemical treatment module comprises a second anoxic tank and a second aerobic tank. Raw water is divided into at least two streams, one stream enters the anaerobic tank after being pretreated, effluent of the anaerobic tank enters the first anoxic tank, and effluent of the first anoxic tank enters the first aerobic tank; the other stream in the raw water enters the second anoxic tank together with the effluent of the first aerobic tank after being pretreated, and the effluent enters the second aerobic tank. The first aerobic tank is also provided with a nitrification liquid return pipeline connected with the first anoxic tank, and the second aerobic tank is also provided with a nitrification liquid return pipeline connected with the first anoxic tank and the second anoxic tank. The effluent treated by the AO biochemical treatment module enters a secondary sedimentation tank, the secondary sedimentation tank performs mud-water separation, and the effluent is used for advanced treatment. According to the invention, the problem of increase of organic matters or total nitrogen in effluent due to incomplete nitrification and denitrification caused by an external carbon source is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a multi-stage and multi-point inflow enhanced denitrification treatment system and method for low carbon-to-nitrogen ratio sewage. Background technique [0002] Biological denitrification is currently the most economical and effective technology in sewage denitrification treatment, including two processes of nitrification and denitrification. Nitrification reaction process: Under aerobic conditions, ammonia nitrogen is oxidized by nitrifying bacteria into nitrite and nitrate. It includes two basic reaction steps: the reaction of converting ammonia nitrogen into nitrite by Nitrosomonas sp; the reaction of converting nitrite into nitrate by Nitrobacter sp. Nitrosomonas and Nitrobacteria are chemoautotrophs that utilize CO 2 , CO 3 2- 、HCO 3- etc. as a carbon source, through NH 3 , NH 4 + , or NO 2 - redox reactions to obtain energy. The nitrification reaction pr...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCC02F9/00C02F3/302C02F1/52C02F1/58C02F1/001C02F1/50C02F1/76C02F1/78C02F2203/006C02F2301/046C02F2301/08C02F2303/14C02F2303/16C02F2209/08C02F2209/16
Inventor 林子厚宁桂兴付国印李玮张越司新朝杨兵强蒋云飞李建商国林赵亮李琦
Owner 河北先河正合环境科技有限公司
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