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Method for protecting electric filter and removing electronegative colloids and particles in brine wastewater by electrodialysis

A technology of electric filter and saline wastewater, applied in electrodialysis, separation method, separation of dispersed particles, etc., can solve unspecified problems, reduce pollution degree, high selectivity and adsorption rate, and be beneficial to environmental protection Effect

Active Publication Date: 2014-04-16
BEIJING JINGRUN NEW TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] Most of the above measures are aimed at preventing fouling of electrodialysis positive membrane, only the third article "strictly control the content of colloid or organic matter in influent" is aimed at preventing electrodialysis negative membrane pollution, but no specific method is given

Method used

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  • Method for protecting electric filter and removing electronegative colloids and particles in brine wastewater by electrodialysis
  • Method for protecting electric filter and removing electronegative colloids and particles in brine wastewater by electrodialysis
  • Method for protecting electric filter and removing electronegative colloids and particles in brine wastewater by electrodialysis

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specific Embodiment 1

[0051] The circulating water sewage in the petrochemical industry is discharged after pretreatment such as hardening and turbidity removal, and is lifted by a pump to enter the electric filter of the present invention for continuous operation. The flow rate is adjusted by the flow meter, and the COD removal effect is controlled by adjusting the voltage and current. The water flow rate of the electric filter is 1m 3 / h, the applied voltage is 30V, the displayed current is 8A, and the sample is tested every 1 hour. The water quality indicators before and after treatment are shown in Table 1. It can be seen from the results in Table 1 that the COD content in the water was significantly reduced after being treated by the electric filter, with an average removal rate of 26% and a maximum of 51.0%.

[0052] Table 1 COD situation after electric filter treatment

[0053]

specific Embodiment 2

[0054] The circulating water and sewage of coal chemical coking enterprises are pretreated by hardening and turbidity removal, and then the water is lifted by a booster pump and enters the electric filter of the present invention for continuous operation. The flow rate is adjusted by the flow meter, and the COD removal effect is controlled by adjusting the voltage and current. The water flow rate of the electric filter is 1m 3 / h, the applied voltage is 35V, the displayed current is 10A, and the sample is tested every 1 hour. The water quality indicators before and after treatment are shown in Table 2. It can be seen from the results in Table 2 that the COD content in the water was significantly reduced after being treated by the electric filter, with an average removal rate of 35.4% and a maximum of 38.5%.

[0055] Table 2 COD situation after treatment by electric filter

[0056]

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Abstract

The invention relates to a method for protecting electric filter and removing electronegative colloids and particles in brine wastewater by electrodialysis. Anion-exchange membranes, partition meshes and anion-exchange membranes are sequentially and alternately arranged between the negative plate and positive plate to constitute an electric filter water channel, and are clamped by a clamping device to constitute an electric filter. When brine wastewater containing electronegative colloids and particles enter the electric filter, a direct current is applied between the positive and negative plates, so that the electronegative colloids and particles in the brine wastewater migrate to the anion-exchange membranes under the action of the electric field; and in the migration process, the electronegative colloids and particles are blocked by the anion-exchange membranes and adhere to the membrane surface or are embedded into the pores of the membranes, thereby removing the electronegative colloids and particles in the brine wastewater. The wastewater adsorbed by the electric filter enters subsequent electrodialysis equipment to perform desalting operation, thereby lowering the pollution level of the negative membranes of the electrodialysis equipment, ensuring the long-term stable operation of the electrodialysis equipment and prolonging the service life of the electrodialysis equipment.

Description

technical field [0001] The invention relates to the technical field of water treatment and saline wastewater concentration, and more specifically relates to an electrodialysis protection method for removing negatively charged colloids, particles, and negatively charged macromolecules in saline wastewater that are seriously harmful to the stable operation of an electrodialysis desalination device through an electric field. Electric filter and method. Background technique [0002] With the development of traditional electrodialysis technology and the society's requirements for water resource utilization, electrodialysis technology has shown its unique advantages in the field of industrial wastewater treatment, especially high-salt sewage treatment and sewage "zero discharge". However, in the long-term operation of electrodialysis equipment, due to the complex composition of industrial wastewater, the pollution of electrodialysis membrane, especially the negative membrane, has ...

Claims

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Application Information

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IPC IPC(8): C02F1/469B01D61/46
Inventor 肖东
Owner BEIJING JINGRUN NEW TECH DEV
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