Method for Optimizing Backwashing Time of Membrane Bioreactor

A membrane bioreactor, backwashing technology, applied in chemical instruments and methods, sustainable biological treatment, biological water/sewage treatment, etc. problems such as normal operation, to achieve the effect of saving backwashing time, increasing the daily processing capacity of the process, and increasing the daily running time

Active Publication Date: 2017-06-20
BEIJING JINKONG DATA TECH +1
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  • Abstract
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Problems solved by technology

However, high-intensity backwashing not only damages the membrane filaments to varying degrees, but also increases the consumption of electricity and water, and takes up time, affects the normal operation of the process, and reduces the daily processing capacity of the process. This is an urgent need Improve the cleaning method
The current cleaning method is simple and limited, lacks flexibility when operating conditions change, and does not consider energy saving and consumption reduction

Method used

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  • Method for Optimizing Backwashing Time of Membrane Bioreactor
  • Method for Optimizing Backwashing Time of Membrane Bioreactor
  • Method for Optimizing Backwashing Time of Membrane Bioreactor

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specific Embodiment

[0048] In this embodiment, the degree of contamination of the membrane module is judged by the transmembrane pressure difference of the membrane module.

[0049] 1. Normal process operation of membrane bioreactor

[0050] Take a water plant with a daily treatment capacity of 9,000 tons as an example. The plant adopts the MBR biofilm reactor membrane process, and the water production cycle is operated in the way of water inflow for 7 minutes and stop for 1 minute.

[0051] 2. Backwash time optimization

[0052] 2.1. Preset the transmembrane pressure difference of the membrane module of the membrane bioreactor, and operate the membrane bioreactor under the test process state. Whenever the transmembrane pressure difference of the membrane module reaches the preset transmembrane pressure difference, the membrane The components are backwashed at different backwashing times, and the flow value of the membrane module is recorded when different backwashing times T have elapsed. Accor...

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Abstract

The invention discloses a method for optimizing the backwashing time of a membrane bioreactor. The method comprises the following steps: conducting backwashing on the membrane bioreactor, and establishing a relation curve of the backwashing time and the membrane flux of a membrane assembly; calculating the membrane flux increase rate mu of the membrane assembly, and establishing a relation curve of the membrane flux increase rate mu and the backwashing time; confirming the highest membrane flux increase rate mu1 and the corresponding backwashing time T1, and searching for the backwashing time T2 corresponding to a ratio of the highest membrane flux increase rate mu1 to a, wherein if T2 is longer than T1, T2 is the optimized backwashing time of the membrane bioreactor. According to the method, the efficiency of cleaning the membrane bioreactor is improved, the energy consumption is reduced, the damage of washing to the membrane bioreactor is weakened, and the service life of the membrane assembly in the membrane bioreactor is prolonged.

Description

technical field [0001] The invention relates to a method for optimizing the backwashing time of a membrane bioreactor. Background technique [0002] MBR membrane bioreactor is a new method of sewage treatment that combines activated sludge method and membrane separation technology, and replaces the secondary sedimentation tank in traditional conventional activated sludge method with membrane separation technology. Compared with the traditional activated sludge method, it has many advantages such as good and stable effluent quality, less residual sludge output, small footprint, easy installation, and convenient operation. At the same time, in the actual application process, there are also some problems, such as easy pollution, relatively short life, high cost, and high energy consumption. In the water treatment process, suspended activated sludge and necrotic microorganisms are easy to foul and block the MBR membrane on the MBR membrane, resulting in a short service life of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 任艳真杨斌文剑平郝金光
Owner BEIJING JINKONG DATA TECH
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