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A system and method for off-line chemical cleaning of mbr membrane units on-line

A technology of chemical cleaning and membrane assembly, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of increasing the construction cost of sewage treatment plants, increasing the operating costs of sewage treatment plants, and long cleaning time, etc. Achieve the effects of saving manpower, reducing construction costs and operating costs, and reducing operating costs

Active Publication Date: 2020-05-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Under normal circumstances, sewage treatment plants need to build at least 2 separate chemical cleaning tanks for off-line chemical cleaning of membrane modules. At least 4 workers are required to work 8 hours a day. Generally, the cleaning time of 40,000 tons / day MBR needs About 2 months; this cleaning method: covers a large area, high labor costs, cumbersome operation, and long cleaning time
In cities where land is very expensive, especially first-tier cities, not only the construction cost of the sewage treatment plant is increased, but also the operating cost of the sewage treatment plant is increased.

Method used

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  • A system and method for off-line chemical cleaning of mbr membrane units on-line
  • A system and method for off-line chemical cleaning of mbr membrane units on-line
  • A system and method for off-line chemical cleaning of mbr membrane units on-line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] combined with figure 1 To illustrate the cleaning of an MBR corridor:

[0059] The muddy water in the 1#MBR corridor 9 is emptied to the coarse grid well 14 through the vent valve 10, and then the clean water in the reclaimed water reuse tank 1 is filled with the clean water in the reclaimed water reuse tank 1 with the backwash pump 2, and the 1#MBR corridor is air-exposed for 48 hours to remove the MBR Part of the mud cake on the surface of the membrane is emptied; continue to pour water to the specified level, then add sodium hypochlorite solution, aerate while adding medicine, when the concentration of sodium hypochlorite reaches 3000-5000ppm, pH = 12-12.5, carry out static soaking for 20 hours, Carry out aeration for another 15 minutes; then open the vent valve 10, and empty the sodium hypochlorite medicinal solution to the coarse grid well; inject clear water into the 1#MBR corridor 9 several times until the pH is neutral, and then vent; then use the dosing system...

Embodiment 2

[0061] combined with image 3 To illustrate the cleaning of the four MBR corridors:

[0062] Vent the muddy water that needs to be cleaned in the 1#MBR corridor 9 to the coarse grid well 14 through the vent valve 10, and then use the backwash pump 2 to fill the 1#MBR corridor with clear water for 48 hours. Remove part of the mud cake on the surface of the MBR membrane and empty it; continue to pour water to the specified level, then add sodium hypochlorite solution, aerate while adding medicine, when the concentration of sodium hypochlorite reaches 3000-5000ppm, pH = 12-12.5, carry out static soaking 20h, then carry out aeration for 15min; then use the remaining sludge pump 12 to pump the sodium hypochlorite liquid through the three-way main valve 13, the three-way valve 18 and the pipeline 20 leading to the 2#MBR corridor to another 2#MBR that needs to be cleaned Corridor 23 is cleaned, and 5% of the sodium hypochlorite dosage is added, and the cleaning method is the same as...

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Abstract

The invention relates to a system and method for off-line chemical cleaning of an MBR (membrane bio-reactor) on line. The system consists of a cleaning and drug adding system, an aeration system, a backwashing system, a liquid medicine emptying and replacement system, and an online monitoring system. A three-way master valve is disposed on a pipeline between a residual sludge pump and a sludge storage tank of the liquid medicine emptying and replacement system, and a pipeline is disposed between the three-way master valve and an MBR corridor. When a plurality of MBR corridors are disposed, the set pipelines are equal to the MBR corridors, three-way valves are arranged between the pipelines and are in parallel connection, and the last MBR corridor has no need for setting of a three-way valve. By adding the three-way master valve and the three-way valves and pipelines leading to all the MBR corridors, the soaked liquid medicine can be pumped through the residual sludge pump to other corridors for further use. Without lifting out the MBR, the system and method provided by the invention can achieve an effect equal to off-line chemical cleaning, and can flexibly grasp the off-line cleaning time and improve the cleaning efficiency.

Description

technical field [0001] The invention relates to a membrane cleaning method in the process of wastewater treatment, in particular to a system and method for performing off-line chemical cleaning on a membrane bioreactor (MBR) in the process of microfiltration or ultrafiltration membrane treatment of sewage. Background technique [0002] Membrane Bio-Reactor (MBR) is a new sewage treatment process developed by combining membrane separation technology with biological principles. It uses a membrane separation device to effectively retain the activated sludge and macromolecular organic substances in the biochemical reaction tank, replacing the secondary settling tank. Compared with the traditional process, it has the advantages of good solid-liquid separation effect, good effluent quality, low sludge production, high biomass in the bioreactor, and small footprint. Its application range and scale in sewage treatment continue to expand. During the filtration process, certain compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/02
CPCB01D65/02B01D2321/162B01D2321/164B01D2321/40
Inventor 吕学斌刘利伟田津
Owner TIANJIN UNIV
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