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Thorough salt separation crystallization technology and system for high-salt wastewater

A crystallization system, high-salt technology, applied in alkali metal sulfite/sulfate purification, multi-stage water treatment, water/sewage treatment, etc., can solve the problem of high amount of miscellaneous salts

Inactive Publication Date: 2018-12-14
广州汉泰环境技术有限公司
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Problems solved by technology

However, in the prior art, even the zero-discharge process still has the problem of high amount of impurity salt

Method used

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  • Thorough salt separation crystallization technology and system for high-salt wastewater

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Embodiment Construction

[0064] The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing and embodiment:

[0065] (1) The average concentration of each pollutant in a certain high-salt water wastewater is: COD Cr 60mg / l, Ca 2+ 150mg / l, Mg 2+ 50mg / l, total alkalinity (as CaCO 3 Total) is 600mg / l, full silicon is 35mg / l, TDS is 22000mg / l, Cl - 7000mg / l, SO 4 2- 6400mg / l, Na + It is 7450mg / l.

[0066] (2) After high-efficiency softening and clarification, filter tank filtration, ultrafiltration device, and resin softening, the average concentration of each pollutant in the effluent of the pretreatment system is: COD Cr 52mg / l, Ca 2+ 0.3mg / l, Mg 2+ 0.2mg / l, total alkalinity (as CaCO 3 Total) is 50mg / l, full silicon is 20mg / l, TDS is 21000mg / l, Cl - 6750mg / l, SO 4 2- 6500mg / l, Na + It is 7500mg / l.

[0067] (3) After pretreatment, the wastewater enters the NF salt separation system, and the average concentration of each pollutant i...

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Abstract

The invention discloses a thorough salt separation crystallization technology for high-salt wastewater, wherein the high-salt wastewater enters an NF salt separation system after being treated by a pretreatment system; NF produced water enters an evaporation crystallization system after being concentrated and purified, and finally sodium chloride crystal salt is produced; NF concentrated water enters a freezing crystallization and melt crystallization system after being purified and concentrated, and finally sodium sulfate crystal salt is produced; part of mother liquor of the freezing crystallization enters a freezing NF system for further salt-nitrate separation, and freezing NF concentrated water is returned to a freezing crystallization unit, and the freezing NF produced water is sentto be mixed with the NF produced water. By adopting the technology provided by the invention, the stability and the high efficiency of salt separation when the water quantity and quality of the systemfluctuate can be ensured, the thorough separation of salt and nitrate is realized, the purity of product salt is high, the recovery rate of the product salt is high, and the production of abraum saltis reduced to the maximum.

Description

technical field [0001] The present invention relates to a technology of thorough salt separation and resource utilization of high-salt waste water. Specifically, the present invention relates to a thorough salt-separation process of high-salt waste water and a thorough salt-separation crystallization system. Background technique [0002] Desulfurization wastewater, mine tail water, and coal chemical wastewater produced in industries such as electric power, petrochemical industry, and coal chemical industry generally have the characteristics of high salt content, high hardness, complex composition, and high pollution. Unreasonable disposal will cause serious environmental damage. pollute. Since these industries are generally located in ecologically fragile areas, there is no receiving water body required for pollution discharge, and there is generally no sufficient water source around the factory. In order to meet production needs, water treatment devices with high recovery r...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/14C01D5/16
CPCC01D3/14C01D5/16C02F1/001C02F1/04C02F1/42C02F1/442C02F1/444C02F9/00C02F2301/08
Inventor 武华平肖强
Owner 广州汉泰环境技术有限公司
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