Concentrated brine retreatment system and process

Abstract

The invention relates to a sewage treatment device and method, in particular to a concentrated brine retreatment system and process, and aims to solve the problems that by-product miscellaneous salt produced in the traditional wastewater treatment process has no reutilization value, crystalline miscellaneous salt has extremely high solubility and poor stability and curability, the risk of secondary pollution exists, and the treatment cost of the crystalline miscellaneous salt is high. The system comprises a primary nanofiltration device, a secondary nanofiltration device, an electrodialysis device, a reverse osmosis device, a concentrated water reverse osmosis device, a freezing device additionally provided with a melting device, a sodium chloride bipolar membrane electrodialysis device and a sodium sulfate bipolar membrane electrodialysis device. Alkali, hydrochloric acid and reuse water are prepared by adopting a two-stage nanofiltration, electrodialysis, bipolar membrane electrodialysis and reverse osmosis coupling process; alkali and sulfuric acid are prepared by adopting a primary nanofiltration, concentrated water reverse osmosis, freezing and bipolar membrane electrodialysiscoupling process.

Description

technical field [0001] The invention relates to a sewage treatment device and method, in particular to a concentrated brine reprocessing system and process. Background technique [0002] The carrying capacity of water resources and water environment capacity is an important restrictive factor for urbanization and the development of modern industry in many areas of our country. With the increasing shortage of fresh water resources, many coastal areas and high water consumption enterprises are using salt water or reclaimed water reuse technology to reduce However, while effectively solving the problem of water shortage, the long-term discharge of concentrated brine also has many adverse effects on the environment. Wastewater "zero discharge" technology has become an important way to solve the contradiction between industrial development and water resources and the environment. The miscellaneous salt by-products in the traditional wastewater treatment process has no reuse value...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the miscellaneous salt by-produced in the traditional wastewater treatment process has no reuse value, the crystalline miscellaneous salt has strong solubility, its stability and solidification are poor, and there is a risk of secondary pollution, and the crystalline miscellaneous salt To solve the problem of higher disposal costs, a concentrated brine reprocessing system and process are provided

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