High-salinity wastewater treatment system and process

Abstract

The invention provides a high-salinity wastewater treatment system and process. The system comprises a pretreatment unit, a double-membrane treatment unit, a hardness removal unit, an electrodialysisdesalination unit and an MVR unit, wherein the pretreatment unit is used for preprocessing high-salinity wastewater; the double-membrane treatment unit is connected with the pretreatment unit; the hardness removing unit is connected with the double-membrane treatment unit; the electrodialysis desalination unit is connected with the hardness removal unit; and the MVR unit is connected with the electrodialysis desalination unit and is used for evaporating and compressing the concentrated water generated after the treatment of the electrodialysis desalination unit, so that the salt of the concentrated water is crystallized and separated out. According to the high-salinity wastewater treatment system and process provided by the invention, the water treatment system and process are reasonably and scientifically combined; and the problems that in an existing high-salinity wastewater treatment process, due to the fact that the hardness of water is increased along with step-by-step concentration, scaling is serious in the system operation process, cleaning is frequent, and the water production rate of the whole system is low are effectively solved.

Description

technical field [0001] The invention relates to the technical field of electrodialysis, in particular to a high-salt wastewater treatment system and process. Background technique [0002] Although my country's water treatment technology has matured after years of development, there are still problems in the treatment of high-salt wastewater such as chemical wastewater treatment, the treatment process is relatively simple, the treatment efficiency generally only meets the discharge standard, and the reuse rate is low. China still lacks high-efficiency, low-cost advanced technology and integrated technology and equipment. At the same time, chemical wastewater is mostly high-salt wastewater. Therefore, the development of this field has become a bottleneck in the development of high-salt wastewater treatment technology. In the existing high-salt wastewater treatment process, the hardness of the water increases with the gradual concentration, resulting in serious fouling and fre...

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Problems solved by technology

[0005] In view of this, the present invention proposes a high-salt wastewater treatment system and process, aiming to solve the problem of scale formation during system operation due to the increase of hardness in water as the concentration increases step by step in the existing high-salt wastewater treatment process. More serious, frequent cleaning, resulting in low water production rate of the whole system

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