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Multi-pole water circulation electrodialysis system and treatment process

A technology of water circulation and electrodialysis, applied in water/sewage treatment, water/sludge/sewage treatment, electrochemical water/sewage treatment, etc., to ensure treatment efficiency, reduce pickling frequency, and reduce the generation of pickling wastewater Effect

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

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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-polar water circulation electrodialysis system and treatment process for the fouling problem of the cathode plate in the power transmission process in the existing electrodialysis technology

Method used

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  • Multi-pole water circulation electrodialysis system and treatment process
  • Multi-pole water circulation electrodialysis system and treatment process
  • Multi-pole water circulation electrodialysis system and treatment process

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Embodiment 1

[0028] The invention improves a multi-polar water circulation electrodialysis system. By adding a multi-channel polar water quality control system, the concentration of multivalent metal ions on the surface of the cathode plate and the concentration of ROS in the feed liquid channel are kept at a low level, and the scaling and oxidation of calcium and magnesium are greatly reduced. The fouling rate of permanent fouling. In the electrodialysis membrane stack, N opposite polar water channels (N is a natural number greater than or equal to 2) are arranged side by side, and the cation selective membrane is used as the diaphragm. The sodium salt solution (such as 3% sodium chloride solution) formed in the channel is ) form a cycle. Each pair of polar water circulation is an independent cycle and equipped with an exhaust device to reduce the Cl in the polar water cycle 2 concentration. figure 2 The working principle diagram of the multipolar water circulation electrodialysis memb...

Embodiment 2

[0032] The desulfurization wastewater concentration and reduction process of a coal-fired power plant includes an electrodialysis system. The plant's desulfurization wastewater has a high salt content, with a calcium ion concentration of 4137mg / L, a magnesium ion concentration of 1513mg / L, and a manganese ion concentration of 11mg / L. In the original electrodialysis system, calcium and magnesium ions were seriously scaled on the cathode plate, and the manganese oxide scale on the surface of the cation exchange membrane of the concentrated water channel on the anode side was seriously scaled. Pickling was required every 3 days. Not only the steps were tedious, but also a large amount of high hardness , Low pH pickling wastewater. In addition, the current efficiency decay rate is fast during the operation of the electrodialysis system, and the heat generated by the membrane stack is relatively serious, which affects the treatment effect of desulfurization wastewater.

[0033] In...

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Abstract

The invention relates to a multi-pole water circulation electrodialysis system which comprises an electrodialysis reactor, a fresh water tank, a concentrated water tank and a pole water quality control system, wherein the electrodialysis reactor is formed by assembling an anode plate, a membrane stack and a cathode plate in sequence; N selective cation exchange membranes are respectively arrangedon two sides, close to the plates, in the membrane stack to form N pole water channels; the middle part of the membrane stack consists of cation selective exchange membranes and anion selective exchange membranes which are arranged at intervals; the pole water quality control system is mainly composed of N pole water circulation and exhaust systems, and each pole water circulation is mainly composed of a pole water tank and a pole water circulation pump. And the pole water circulation is provided with an exhaust system, and the exhaust system mainly comprises a fan and an acid absorption box.The multi-pole water circulation electrodialysis system has the beneficial effects that by utilizing the electrodialysis system based on multi-pole water circulation, the scaling rate of the pole plate and the ion exchange membrane can be greatly reduced, the safety of the system is improved, and the treatment efficiency of the electrodialysis system on high-salinity wastewater is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of environmental protection water treatment, and in particular relates to a multipolar water circulation electrodialysis system and a treatment process. Background technique [0002] Electrodialysis is an electrically driven membrane separation technology based on selective ion exchange membranes. It has the advantages of high efficiency, low energy consumption, convenient operation, high selectivity, and high recovery of raw water. It is widely used in electronics, medicine, food, Chemical, environmental protection, industrial and other fields. Electrodialysis technology has significant advantages in the treatment of high-salt and difficult-to-treat wastewater, and its applications in brackish water desalination, seawater salt production, and concentration of desulfurization wastewater are becoming more and more mature. [0003] When the electrodialysis system treats high-salt wastewater, fouling of electr...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F1/46
CPCC02F1/4693C02F1/4602C02F2303/14Y02A20/124
Inventor 冯向东徐浩然张贺陈彪
Owner ZHEJIANG ZHENENG TECHN RES INST
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