Device and method for in-situ sludge reduction by intensive AOMBR (anoxic/aerobic membrane bioreactor) process

A sludge in-situ reduction and process technology, applied in the field of sewage treatment, can solve the problems of high operating energy consumption and infrastructure costs, increased energy consumption and operating costs, and large capacity of sludge storage tanks, etc., to achieve enhanced sludge attenuation Phenomenon, energy saving, enhanced effect of dissimilation

Active Publication Date: 2019-06-18
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relevant studies have shown that the anaerobic side flow sludge in situ reduction process (ASSR) process achieves a better sludge reduction rate. Compared with the main treatment process, the sludge storage tank must maintain a relatively long sludge (hydraulic) residence time, but it will result in larger mud storage tank capacity, high operating energy consumption and infrastructure costs, which weakens its application advantages in actual engineering
Although the sludge residence time in the ASSR process sludge tank can be shortened by coupling other bypass sludge reduction methods (such as ultrasonic and ozone treatment), it will result in an increase in energy consumption and operating costs

Method used

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  • Device and method for in-situ sludge reduction by intensive AOMBR (anoxic/aerobic membrane bioreactor) process
  • Device and method for in-situ sludge reduction by intensive AOMBR (anoxic/aerobic membrane bioreactor) process
  • Device and method for in-situ sludge reduction by intensive AOMBR (anoxic/aerobic membrane bioreactor) process

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Experimental program
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Effect test

Embodiment 1

[0036] The experimental sludge was taken from the activated sludge of the aerobic pool of Zigong City Wastewater Treatment Plant, and the concentration of the inoculum sludge was 5000-6000mg / L.

[0037] The present invention a kind of technology that strengthens the in-situ reduction of AOMBR process sludge, such as figure 2 As shown, the following steps are included: the sewage enters the anoxic tank 2 through the water inlet 1, and the sewage and the sludge are fully mixed through the action of the mechanical agitator 12, and part of the granular, colloidal, and dissolved carbon sources in the raw sewage It is hydrolyzed and acidified by the action of microbial flora, and converted into easily biodegradable small molecular substances, and then the mixed solution degraded by the anoxic pool 2 passes through the partition baffle 14 between the anoxic pool 2 and the aerobic pool 3, and is formed by the anoxic pool 2. The bottom of the oxygen tank 2 enters the upper part of the...

Embodiment 2

[0040] The experimental sludge was taken from the activated sludge of the aerobic pool of Zigong City Wastewater Treatment Plant, and the concentration of the inoculum sludge was 5000-6000mg / L. Attached figure 2 Device, set the dissolved oxygen in the anoxic tank to be controlled at 0.3mg / L, the DO in the aerobic tank to be controlled at 3.0mg / L, the dissolved oxygen in the side stream anaerobic reactor to be lower than 0.1mg / L, and the dissolved oxygen in the membrane tank to be controlled at 7mg / L; the flow rate of water controlled by the peristaltic pump is 49L / d. Influent water quality is chemical oxygen demand (COD) concentration 500mg / L; ammonia nitrogen (NH4+-N) content 55mg / L; total nitrogen (TN) content 70mg / L, total phosphorus (TP) content 4.5mg / L.

Embodiment 3

[0042] The experimental sludge was taken from the activated sludge of the aerobic pool of Zigong City Wastewater Treatment Plant, and the concentration of the inoculum sludge was 5000-6000mg / L. Attached figure 2 Device, set the dissolved oxygen in the anoxic tank to be controlled at 0.5mg / L, the DO in the aerobic tank to be controlled at 3.5mg / L, the dissolved oxygen in the side stream anaerobic reactor to be lower than 0.1mg / L, and the dissolved oxygen in the membrane tank to be controlled at 8mg / L; the flow rate of water controlled by the peristaltic pump is 49L / d. The influent water quality is as follows: chemical oxygen demand (COD) concentration 600mg / L; ammonia nitrogen (NH4+-N) content 60mg / L; total nitrogen (TN) content 75mg / L, total phosphorus (TP) content 5mg / L.

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Abstract

The invention belongs to the technical field of sewage treatment and discloses a device and method for in-situ sludge reduction by an intensive AOMBR (anoxic/aerobic membrane bioreactor) process. Themethod includes steps: feeding sewage into an anoxic pond from a water inlet, mechanically stirring to well mix the sewage with sludge, enabling mixed liquid to enter the upper portion of an aerobic pond from the bottom of the anoxic pond, completely mixing solution through an aeration device and a submersible pump, controlling dissolved oxygen, enabling the solution to enter the upper portion ofa high-oxygen membrane pool from the bottom of the aerobic pond, controlling dissolved oxygen through the aeration device, discharging the solution through a discharging pump and an MBR membrane component, returning a part of mixed liquid in the high-oxygen membrane pool to the anoxic pond through a nitrification liquid return pump and a pump pipe, enabling the other part of the mixed liquid to laterally flow to an anaerobic reactor through a sludge return pump and a pump pipe, mechanically stirring to make the sludge in a suspended state and well contact with filler, and flowing into the anoxic pond from an overflow pipe through a connection pipe. By adoption of the method, pollutant removal effects can be improved, the excess sludge yield can be reduced, and system nutrient substance removal effects can be improved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, relates to a sludge reduction technology, in particular to a method and a device for strengthening the in-situ reduction of sludge in an AOMBR process. Background technique [0002] Activated sludge method is currently the most widely used sewage treatment method in my country. During the operation of activated sludge process, a large amount of excess sludge will be generated. The ecological environment has caused serious secondary pollution. With the continuous improvement of sewage treatment rate, the effective disposal of a large amount of excess sludge produced by it has become a very difficult problem. At present, after concentration, dehydration and stabilization of excess sludge, more than 90% of the sludge is finally disposed of in land use, sanitary landfill, or incineration. However, due to factors such as economy, environment and regulations, the treatment and disposal of exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
Inventor 宁欣强郭宇岳娇刘太鑫吴嘉煦曾杨杨莹周敏张彬
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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