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Method for alleviating contamination of membrane bioreactor through activated carbon refreshing

A membrane bioreactor and activated carbon technology, applied in chemical instruments and methods, biological water/sewage treatment, biological treatment devices, etc., can solve the problems of reducing the production efficiency of membrane bioreactors, popularizing and applying membrane fouling, shortening the service life of membranes, etc. problems, achieving good dehydration performance, reduced replacement costs, and reduced cleaning costs

Inactive Publication Date: 2018-07-13
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Membrane fouling is still a bottleneck problem hindering its popularization and application
Membrane fouling reduces membrane bioreactor production efficiency, increases energy requirements due to air scour, requires frequent membrane cleaning to restore its permeability; the latter shortens membrane lifetime and results in high membrane replacement costs

Method used

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  • Method for alleviating contamination of membrane bioreactor through activated carbon refreshing
  • Method for alleviating contamination of membrane bioreactor through activated carbon refreshing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for renewing activated carbon to slow down membrane bioreactor fouling, the process is:

[0020] MBR is used to treat domestic sewage. According to the volume of the biofilm reactor, 1.0g / L powdered activated carbon is added to the MBR system. After the system runs stably, the powdered activated carbon will not be renewed. After 30 days of continuous operation, the transmembrane pressure drop was 30.8kPa lower than that of the control group without powdered activated carbon. The removal rate of organic matter in the supernatant reaches 89.32%±5.65%, the removal rate of ammonia nitrogen in the supernatant reaches 98.59%±0.92%, and the removal rate of total nitrogen in the supernatant reaches 27.54%±9.60%. The removal rate reached 95.41%±2.37% and 98.10%±1.33%.

Embodiment 2

[0022] A method for renewing activated carbon to slow down membrane bioreactor fouling, the process is:

[0023] MBR is used to treat domestic sewage. According to the volume of the biofilm reactor, 2.0g / L powdered activated carbon is added to the MBR system. After the system runs stably, the powdered activated carbon will not be renewed. After 30 days of continuous operation, the transmembrane pressure drop was 32kPa lower than that of the control group without powdered activated carbon, such as figure 1 -A. The removal rate of organic matter in the supernatant reaches 90.34%±2.90%, the removal rate of ammonia nitrogen in the supernatant reaches 98.94%±0.99%, the removal rate of total nitrogen in the supernatant reaches 31.80%±14.80%; the removal rate of organic matter and ammonia nitrogen in the effluent reaches 95.73% %±1.93% and 97.97%±1.46%.

Embodiment 3

[0025] A method for renewing activated carbon to slow down membrane bioreactor fouling, the process is:

[0026] MBR is used to treat domestic sewage. According to the volume of the biofilm reactor, 4.0g / L powdered activated carbon is added to the MBR system. After the system runs stably, the powdered activated carbon is not renewed. After 30 days of continuous operation, the transmembrane pressure difference was 26.30kPa lower than that of the control group without powdered activated carbon. The removal rate of organic matter in the supernatant reaches 88.34%±4.64%, the removal rate of ammonia nitrogen in the supernatant reaches 98.47%±1.16%, the removal rate of total nitrogen in the supernatant reaches 20.80%±7.01%; the removal rate of organic matter in the effluent reaches 95.43% %±2.90% and 98.27%±1.40%.

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Abstract

The invention discloses a method for alleviating contamination of a membrane bioreactor through activated carbon refreshing. The method comprises the following steps: A, putting 0.5-4.0g / L of powderedactivated carbon into a membrane bioreactor system, carrying out aeration, and stirring uniformly till the system has a stable contaminant removal effect; B, after the combined system of the poweredactivated carbon and the bioreactor is operated stably, taking out a mixed liquid which accounts for 0.1-2.50% of the volume of a mixed liquid of activated carbon-activated sludge in the membrane bioreactor each day, and at the same time adding new activated carbon which accounts for 0.1-2.50% of the mass of the activated carbon added into the membrane bioreactor before, thereby maintaining bioactivity and retarding membrane contamination. The method is feasible to operate and simple and convenient to operate, membrane contamination can be alleviated, the synergetic effects of the powered activated carbon and the membrane bioreactor can be relatively well taken into play, normal and stable operation of the membrane bioreactor can be ensured, the contamination velocity can be reduced, the service life of the membrane can be prolonged, simplicity and convenience in operation can be achieved, and certain economic benefits and environment benefits can be made.

Description

technical field [0001] The invention belongs to the technical field of membrane pollution control in membrane bioreactors, and more specifically relates to a method for renewing activated carbon to slow down MBR membrane pollution, and also relates to a method for renewing powdered activated carbon in MBR, which is suitable for pretreatment of slightly polluted drinking water sources and municipal pollution Water treatment and industrial sewage treatment and many other aspects. Background technique [0002] Membrane bioreactor (MBR) is a mature and widely used treatment technology for urban and industrial wastewater all over the world. Membrane fouling is still a bottleneck problem hindering its popularization and application. Membrane fouling reduces membrane bioreactor production efficiency, increases energy requirements due to air scour, and requires frequent membrane cleaning to restore its permeability; the latter shortens membrane lifetime and leads to high membrane r...

Claims

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Application Information

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IPC IPC(8): C02F3/12
CPCC02F3/1268C02F2003/003C02F2203/006C02F2209/08C02F2209/14C02F2209/16C02F2303/14Y02W10/10
Inventor 左行涛张事廖玮熊娟
Owner HUAZHONG AGRI UNIV