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Anti-scaling electrodialysis system based on pH control and treatment process

Pending Publication Date: 2021-02-26
ZHEJIANG ZHENENG TECHN RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide an anti-scaling electrodialysis system and treatment process based on the pH control technology of the electrode water channel for the scaling problem of the cathode plate in the current electrodialysis technology during the power transmission process

Method used

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  • Anti-scaling electrodialysis system based on pH control and treatment process
  • Anti-scaling electrodialysis system based on pH control and treatment process
  • Anti-scaling electrodialysis system based on pH control and treatment process

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Embodiment 1

[0029]There are various scaling control factors, mainly including water quality, water temperature, flow rate, heat exchange temperature difference, corrosion and scale inhibitors, etc. Among them, pH is an important indicator of water quality. Lowering the pH of the treatment solution can greatly reduce the scaling of calcium and magnesium. tendency. Such asfigure 1 As shown, during the working process of the electrodialysis membrane stack, the divalent cations (mainly calcium ions and magnesium ions) in the adjacent channels will enter the polar water channel through diffusion and ion exchange, and will continue to generate OH on the surface of the cathode plate.-After the combination, calcium and magnesium scale will be precipitated and attached to the surface of the cathode plate. At this time, the migration rate of divalent ions in the cathode electrode water is far higher than the migration rate of divalent ions in the anode electrode water, and the divalent ions are quickly l...

Embodiment 2

[0035]A coal-fired power plant uses an electrodialysis system to concentrate desulfurization wastewater. The desulfurization wastewater has not been softened before entering the system, and the calcium ion concentration and magnesium ion concentration are relatively high. The specific water quality is shown in the table below:

[0036]

[0037]The electrodialysis system uses 3% sodium chloride solution as the polar water. Due to the high hardness of desulfurization wastewater, calcium ions and magnesium ions will pass through the polar membrane under the action of electric field and permeation, causing the hardness of the polar water to rise rapidly. In a certain treatment process, the newly configured extreme water calcium ion concentration is 9mg / L and magnesium ion concentration is 3mg / L. After 5 hours of treatment, the calcium ion concentration increases to 1377mg / L and the magnesium ion concentration increases to 259mg / L. L. After 7 days of operation, the electrodialysis membrane sta...

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Abstract

The invention relates to an anti-scaling electrodialysis system based on pH control. The anti-scaling electrodialysis system comprises an electrodialysis reactor, a fresh water tank, a concentrated water tank, a pH control system and an acid absorption system, wherein the electrodialysis reactor is formed by assembling an anode plate, a membrane stack and a cathode plate in sequence; the membranestack is composed of cation selective exchange membranes and anion selective exchange membranes which are arranged at intervals to form fresh water channels and concentrated water channels which are arranged at intervals, and polar water channels are arranged on the two sides close to the polar plates respectively; the pH control system is mainly composed of an acid storage tank, an acid adding pump, a pipeline mixer and an online pH meter, a polar water outlet of the polar water tank is connected to an inlet of the pipeline mixer, and the online pH meter is installed at the inlet end of the pipeline mixer. The anti-scaling electrodialysis system based on pH control has the beneficial effects that polar plate scaling in the system operation process can be avoided, scaling-free operation ofthe electrodialysis system is achieved, the operation working condition is optimized, and the water treatment efficiency is improved.

Description

Technical field[0001]The invention belongs to the technical field of environmental protection water treatment, and specifically relates to an electrodialysis system and a treatment process for preventing scaling of electrodialysis electrode plates by controlling the pH of the polar water.Background technique[0002]As a water treatment technology developed in the 1950s, electrodialysis technology has the characteristics of low energy consumption, low environmental pollution, strong adaptability, durable equipment, easy mechanization, and high utilization rate. It is widely used in electronics, Medicine, food, chemical industry, environmental protection, industry and other fields. The use of electrodialysis technology for wastewater concentration, pure water preparation, acid-base recovery, and resource reuse of useful substances in waste liquids are frequently reported.[0003]During the application of electrodialysis technology, a large amount of OH is inevitably produced on the surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F1/66B01D53/14B01D53/18B01D53/78C02F1/46
CPCC02F1/4693C02F1/4602C02F1/66B01D53/78B01D53/18B01D53/14
Inventor 徐浩然冯向东张贺吕佳慧
Owner ZHEJIANG ZHENENG TECHN RES INST
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