High-salt wastewater salt separation system and process

Abstract

The invention discloses a high-salt wastewater salt separation system. The high-salt wastewater salt separation system comprises a raw water tank, a nanofiltration unit, a sodium chloride evaporationand crystallization unit, a sodium sulfate evaporation and crystallization unit, an organic concentration unit, an ozone reaction tank and a mixed salt evaporation and crystallization unit; and zero discharge of high-salt water can be achieved, water resources are saved, the environment is protected, operation is stable, safety and reliability are achieved, operating cost is low, and certain economic and social benefits are achieved. The invention further discloses a high-salt wastewater salt separation process. The high-salt wastewater salt separation process comprises the following steps ofstep one, nanofiltration, step two, sodium chloride crystallization and sodium sulfate crystallization, step three, organic concentration; step four, ozone oxidation, and step five, abraum salt crystallization. The water quality of produced reuse water meets the standard of ''Quality standards of reclaimed water for circulating cooling water HG-T3923-2007''; industrial sodium chloride produced reaches the A-level standard of refined industrial dry salt, and can be packaged for sale; and industrial sodium sulfate produced reaches first-class standard of I-class salt, and can be packaged for sale.

Description

Technical field: [0001] The invention relates to the field of wastewater treatment, in particular to a high-salt wastewater salt separation system and a process thereof. Background technique: [0002] Coal chemical enterprises will produce a large amount of high-salt wastewater during production and operation. High-salt wastewater has the characteristics of complex components, large fluctuations in water quality and quantity, high salt content, and high toxicity. At present, most of my country's coal chemical enterprises are concentrated in the western region with a fragile ecological environment. There is no sewage receiving water in the surrounding areas, and there is no condition for the discharge of waste water, so it must be treated before it can be discharged to the outside. At present, there are two commonly used methods for treating high-salt wastewater: 1. Use evaporation ponds to evaporate water. The problem is that the natural evaporation effect is not ideal, and i...

AI Technical Summary

Problems solved by technology

Currently, there are two commonly used methods for treating high-salt wastewater: 1. Use evaporation ponds to evaporate water. The problem is that the natural evaporation effect is not ideal, and it will cause waste of water resources, and the salt in the wastewater cannot be treated. Recycling causes a waste of resources and reduces the economic benefits of the enterprise

2. Using evaporation and crystallization technology to recover water and produce crystalline salt, but the quality of the obtained crystalline salt is poor, it is difficult to meet the production standard, and it is difficult to effectively use; in addition, although the treated wastewater can meet the national and local wastewater discharge standards, but Some organic matter, microorganisms, colloids, suspended particles, Ca 2+ and Mg 2+ and other high-priced ions, a large amount of soluble inorganic salts, etc., thus limiting the reuse of industrial wastewater and causing a lot of waste of water resources

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