Electrodialysis device applicable to treatment on high-salinity wastewater from industries such as coal chemical industry

Abstract

The invention relates to an electrodialysis device applicable to treatment on high-salinity wastewater from industries such as coal chemical industry. The electrodialysis device comprises an electrodialysis membrane stack unit, a frequent polarity conversion control unit and an online monitoring and process control unit, wherein the electrodialysis membrane stack unit consists of a plurality of membrane stacks which are connected with one another in series through pipelines in a desalted department, a concentrated department and a pole compartment respectively and form a multi-level inversion system with solution flow direction control; a programmable logic controller (PLC) unit, a rectifier and a solenoid valve are used for implementing frequent polarity conversion; and solutions in the desalted department and the concentrated department can be cycled or partially cycled, thereby obtaining a high fresh water recovery rate and a high concentrated water concentration multiple. The electrodialysis device can fundamentally solve the problems of low fresh water recovery rate, low concentrated water concentration multiple, high energy consumption and difficulty in long-term and stable operation in the process of treating the high-salinity wastewater in the coal chemical industry and the like by an ultrafiltration-reverse osmosis method, and thus the engineering application of the electrodialysis treatment technology for the high-salinity wastewater in the industries such as the coal chemical industry is promoted.

Description

technical field [0001] The present invention relates to the field of electrodialysis treatment equipment for high-salt wastewater in coal chemical industry and other industries. Specifically, the present invention relates to an electrodialysis device for high-salt wastewater treatment in coal chemical industry. Industrial high-salt wastewater to obtain high freshwater recovery rate and high concentrated water concentration multiples. Background technique [0002] Coal chemical industry and other industries have undergone a series of treatments such as filtration, flocculation, biological methods, and catalytic oxidation. Although they can meet the wastewater discharge standards, they cannot be reused due to high salt content. The characteristics of high-salt wastewater in coal chemical industry and other industries are high salt content, the pollutants are mainly total salt content, usually 500-5000mg / L or even higher, and it also contains refractory organic matter. At pres...

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Problems solved by technology

[0006] In view of the characteristics of high-salt wastewater in the coal chemical industry and other industries, there are problems such as low recovery rate of fresh water, low concentration multiple, and environmental pollution caused by a large amount of concentrated water discharge by using ultrafiltration-reverse osmosis. The electrodialysis device for the treatment of salty wastewater, through the series connection of multiple electrodialysis membrane stacks 3, the flow direction control of concentrated water and concentrated water, constitutes multi-stage countercurrent desalination or concentration, and realizes the circulation or partial circulation of electrodialysis fresh water and concentrated water; it is controlled by PLC unit 6 Frequent electrode reversal reduces scaling and membrane fouling on the ion exchange membrane surface caused by electrodialysis concentration polarization; through online monitoring of process parameters such as conductivity and temperature, status diagnosis, process control and system protection of the electrodialysis system are realized , thus forming a multi-stage countercurrent reverse electrode electrodialysis system

[0007] The purpose of the present invention is to provide an electrodialysis device for the treatment of high-salt wastewater in the coal chemical industry and other industries, to solve the problem of high energy consumption and difficulty in long-term stable operation of conventional electrodialysis devices used in this type of wastewater treatment, and the problems of ultrafiltration-reverse The osmosis method has problems such as low recovery rate of fresh water, low concentration multiple, and large amount of wastewater discharge, so as to promote the engineering application of high-salt wastewater electrodialysis treatment technology in coal chemical industry and other industries

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