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Method for strengthening filter capacity of osmotic membrane through dielectrophoresis technology

A technology of dielectrophoresis and filtration ability, applied in the field of separation, can solve problems such as unsuitable industrial conditions, hindering widespread use, pH value changes, etc., to achieve the effect of increasing membrane permeation, increasing service life, reducing energy and cost

Inactive Publication Date: 2013-12-25
INNER MONGOLIA TIANYI ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is not suitable for industrial conditions of multi-ion complexity, and its high energy consumption hinders its widespread use in industry
In addition, the use of bare electrodes in electrophoresis also increases the possibility of short circuit and the risk of electric shock, and the electrochemical reaction on the electrode will not only lead to pH changes, but even produce toxic or environmentally polluting chemical by-products

Method used

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  • Method for strengthening filter capacity of osmotic membrane through dielectrophoresis technology
  • Method for strengthening filter capacity of osmotic membrane through dielectrophoresis technology
  • Method for strengthening filter capacity of osmotic membrane through dielectrophoresis technology

Examples

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Effect test

Embodiment 1

[0024] A kind of method adopting dielectrophoresis technique to strengthen the filtration ability of osmotic membrane, the steps are:

[0025] (1) Microfiltration technology is used to separate the suspension of 5 grams per liter of clay in water, and the interdigitated electrode structure composed of cylindrical electrodes is installed under the microfiltration osmotic membrane. Because the dielectric polarization ability of clay is much smaller than that of water, it exhibits negative dielectrophoretic properties, so that small clay particles (most particles with a diameter of about 100 nanometers) are pushed away from the microfiltration permeable membrane to reduce membrane fouling, such as figure 1 shown.

[0026] (2) When the dielectrophoretic force is continuously applied, that is, the voltage is 300V, the frequency is 200KHZ, and the continuous application of uninterrupted power supply, within six hours, the membrane permeation is stable at more than 82% of the acciden...

Embodiment 2

[0029] A kind of method adopting dielectrophoresis technique to strengthen the filtration ability of osmotic membrane, the steps are:

[0030] ⑴ Microfiltration technology is used to separate the suspension of 5 grams per liter of metal particles in water, and the interdigitated electrode structure composed of cylindrical electrodes is installed in the microfiltration osmotic membrane. Since the dielectric polarization ability of metal particles is much greater than that of water, it exhibits positive dielectrophoretic properties, so that small metal particles (most of which have a diameter of about 100 nanometers) are polarized to produce a unique chain effect of dielectrophoresis, which will cause Aggregation results in a larger volume, and rapidly sinks under the action of gravity and intermittent application of dielectrophoresis, thereby achieving the effect of reducing the pollution of the microfiltration permeable membrane. like figure 1 shown.

[0031] All the other s...

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Abstract

The invention relates to a method for strengthening filter capacity of an osmotic membrane through dielectrophoresis technology. The method comprises the following steps: (1) separating suspension through a microfiltration technology, and filtering through a dielectrophoresis osmotic membrane assembly; (2) continuously applying a dielectrophoresis force, namely, a voltage of 300 V and a frequency of 200 KHZ, and continuously providing uninterrupted power supply, wherein the membrane permeability is stably higher than 82% of the accident permeability within 6 hours; and (3) discontinuously applying the dielectrophoresis, providing the power supply for 5 min, stopping for 15 min, and repeatedly circulating according to the frequency, wherein the voltage is 300 V and the frequency is 200 KHZ. According to the method, the dielectrophoresis is applied to both eliminate the membrane pollution problem and ensure low energy consumption and low operation cost; compared with the backwashing technology frequently used in industry, a dielectrophoresis reinforcement membrane is used without stopping the work of an osmotic membrane filtering process.

Description

technical field [0001] The invention belongs to the field of separation technology, and relates to reducing or even eliminating membrane fouling and membrane plugging in the osmotic membrane process to strengthen the osmotic membrane process, in particular to a method for enhancing the filtration capacity of the osmotic membrane by using dielectrophoresis technology. Background technique [0002] In the past 30 years, permeable membrane separation technology has rapidly developed into a multi-phase (mainly solid-liquid, solid-gas and liquid-liquid, etc.) important process. However, in the osmotic membrane filtration process, the inevitable problem of membrane fouling always exists, and has become a fatal shortcoming in the practical application of this process. Membrane fouling is due to the clogging or shrinking of the membrane pores due to the deposition or reproduction of particles, colloidal particles, solute molecules, or bacteria, viruses, etc. Decrease, reduce the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/00B01D63/02
Inventor 王冰杜飞
Owner INNER MONGOLIA TIANYI ENVIRONMENTAL TECH
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