Method for improving pollution resistance and flux of membrane by using weak electric field

A weak electric field, anti-pollution technology, used in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., to achieve high flux levels, improve water treatment efficiency, and long operating cycles.

Inactive Publication Date: 2011-01-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few studies on the influence of electric field on microorganisms and the influence of water treatment capacity

Method used

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  • Method for improving pollution resistance and flux of membrane by using weak electric field
  • Method for improving pollution resistance and flux of membrane by using weak electric field
  • Method for improving pollution resistance and flux of membrane by using weak electric field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The MBR system contains a common water inlet and water level control system (high level water tank and balance water tank). The high level water tank stores water, and the balance water tank controls the liquid level in the reactor through a ball valve. The water intake is artificially simulated wastewater. The water outlet system uses a peristaltic pump to pump out the water, and a vacuum gauge is placed at the front end of the peristaltic pump to monitor the transmembrane pressure of the membrane module. The aeration system uses an air aerator for aeration, and the gas flow is controlled by a gas rotameter.

[0023] The method of applying a weak electric field to the membrane module: such as figure 2 As shown, the wire 13 containing the copper wire is stripped off an appropriate length of insulation sheath, and the exposed copper wire is divided into two parts and placed on both sides of the support body 18 of the plate membrane module, and the sealing frame 16 and t...

Embodiment 2

[0026] Use a self-conductive membrane material such as polyaniline composite membrane material as the cathode, that is, composite the non-woven fabric membrane with the conductive polymer polyaniline, place the membrane in the plate membrane module and connect it to the negative electrode of the power supply, so that the membrane has both filtration and The ability to apply an electric field as a negative electrode. All the other implementation steps are as described in Example 1. Obtained the same significant effects of slowing down membrane fouling and improving flux as in Example 1.

Embodiment 3

[0028] Since the voltage required by the invention is small, the microbial fuel cell can fully meet the voltage required by the invention, so the DC power supply is replaced by a microbial fuel cell for power supply, and the rest of the implementation is shown in Example 1. The use of microbial fuel cells will completely avoid the increase of energy consumption, and microbial pigment cells can rationally utilize the substances and energy in part of sludge and part of sewage. Its effect of improving membrane antifouling performance and flux is similar to that of Example 1.

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Abstract

The invention discloses a method for improving pollution resistance and flux of a membrane by using a weak electric field, which belongs to the technical field of membrane bioreactors (MBR) and is characterized in that: based on a principle that homo-polarity repels, a weak negative electric field is applied near a membrane face to increase resistance to pollutant and push the membrane pollutant away from the membrane surface and therefore has the effects of delaying the formation of a filter cake layer, increasing the pollution resistance of the membrane, improving the flux and prolonging a filtration operation period. The method is to use a conductive copper wire arranged in a plate type membrane component as a cathode or directly apply the weak negative electric field to a membrane material with the conductive property. The method has the advantages that: energy consumption is low, high-intensity electric field is avoided, and the operation is carried out in an intermittent way; the composition and metabolic characteristics of microbes are considerably influenced and the water treatment capability of the microbes is influenced; the method is convenient to implement, and power can be supplied by waste water, sludge and microbe fuels, so that additional energy consumption is avoided and water treatment capability is improved. Thus, the method has a very promising application prospect.

Description

technical field [0001] The invention belongs to the technical field of membrane bioreactor (MBR). It involves using the weak electric field and the negative charge of the negative electrode to generate repulsion to the membrane pollutants to slow down and control the membrane pollution, using the electric field to strengthen the metabolism of microorganisms and using the weak electricity generated by the microbial fuel cell. Specifically, it involves using the characteristics that most of the membrane pollutants in the MBR are negatively charged and the principle of same-sex repulsion, placing the cathode in the membrane module or directly using the conductive film as the cathode, applying a weak electric field, the negative electrode will repel the pollutants, and delay Formation of filter cake layer, control of membrane fouling. Because the applied voltage is low, the reactor can be powered by the microbial fuel cell, which has the characteristics of energy saving and enhan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/10
CPCY02W10/10
Inventor 柳丽芬刘嘉栋高波杨凤林
Owner DALIAN UNIV OF TECH
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