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Method and system for recovering sodium chloride from high salinity wastewater

A technology with high salt content and sodium chloride, applied in chemical instruments and methods, water softening, alkali metal chlorides, etc., can solve the problems of low recycling rate, achieve the effect of reducing operating costs and obtaining economic benefits

Inactive Publication Date: 2016-08-31
SHUANGLIANG ECO ENERGY SYST CO LTD
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  • Application Information

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Problems solved by technology

[0002] When the high-concentration brine discharged from industries such as petrochemical, coal chemical, power plant, and oilfield mining undergoes zero-discharge treatment through evaporation and crystallization, the final miscellaneous salt is usually landfilled as solid waste, which has a certain risk of environmental pollution and can be recycled. rate is not high

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  • Method and system for recovering sodium chloride from high salinity wastewater

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Embodiment 1

[0027] Based on the method of recovering sodium chloride from high-salt wastewater based on the above system, the TDS of the saline wastewater discharged by reverse osmosis in a coal chemical industry is 25,000 mg / L. After the wastewater is purified by calcium chloride + soda ash + activated carbon, the solid-liquid separation The obtained supernatant enters the nanofiltration unit to separate a monovalent ion supernatant and a dope. The TDS of the monovalent ion supernatant is 10000 mg / L and the TDS of the dope is 40000 mg / L, and the dope returns to Purification unit, the clear liquid enters the reduction DTRO unit to concentrate until the concentrated liquid with a TDS of 90,000 mg / L, and the recovered water is reused; the concentrated liquid enters the evaporation crystallization unit, crystallizes and separates chlorine that meets the GB / T 5462-2003 Class II standard Sodium chloride, the condensate is reused.

Embodiment 2

[0029] Based on the method of recovering sodium chloride from high-salt wastewater based on the above system, the TDS of the saline wastewater discharged by reverse osmosis in a certain coal chemical industry is 30,000 mg / L. After the wastewater is purified by lime + flue gas, it is obtained by solid-liquid separation The clear liquid enters the nanofiltration unit to separate a monovalent ion clear liquid and a concentrated liquid. The TDS of the monovalent ion clear liquid is 15000 mg / L and the TDS of the concentrated liquid is 50000 mg / L, and the concentrated liquid is returned to the purification unit , the clear liquid enters the reduction DTRO unit to concentrate to a concentrated liquid with a TDS of 120,000 mg / L, and the recovered water is reused; the concentrated liquid enters the evaporation crystallization unit, and crystallizes to separate sodium chloride that meets the GB / T 5462-2003 Grade II standard , the condensate is reused.

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Abstract

The invention relates to a system for recovering sodium chloride from high salinity wastewater. The system is composed of a purifying unit, a nano-filtering unit, a reduction unit and an evaporation and crystallization unit. Calcium, magnesium, silicon oxide and matter prone to scaling and COD type organic matter are removed from high salinity wastewater through the purifying unit, the product enters the nano-filtering unit to be separated so that one stream of monovalent ion clear liquid and the other stream of thick liquid can be generated, the thick liquid returns to the purifying unit, monovalent ion clear liquid enters the reduction unit to be further concentrated, recovery water is generated for reuse, obtained concentrated liquid enters the evaporation and crystallization unit to be evaporated and crystallized and separated to obtain industrial sodium chloride, condensate water is reused, and a small amount of discharged mother solution returns to the purifying unit. Sodium chloride and other inorganic salt in high salinity wastewater are effectively separated and recovered, and meanwhile obtained recovered water can completely meet the reuse requirement.

Description

technical field [0001] The invention relates to a method for treating high-salt wastewater, in particular to a system for recovering sodium chloride from high-salt wastewater. Background technique [0002] When the high-concentration brine discharged from industries such as petrochemical, coal chemical, power plant, and oilfield mining undergoes zero-discharge treatment through evaporation and crystallization, the final miscellaneous salt is usually landfilled as solid waste, which has a certain risk of environmental pollution and can be recycled. The rate is not high. [0003] In order to improve the late stage of sewage treatment, the classified recovery and reuse of miscellaneous salts is the development trend of high-salt sewage treatment. The above-mentioned high-concentration brine is evaporated and crystallized with zero discharge, and the sodium chloride with high value is separated and recovered during the process. Obtaining sodium chloride that meets the industria...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/06C02F101/12C02F101/20
CPCC02F9/00C01D3/06C02F1/04C02F1/283C02F1/441C02F1/444C02F1/4693C02F5/02C02F5/06C02F2101/12C02F2101/20
Inventor 王建国孙家喜孙烨
Owner SHUANGLIANG ECO ENERGY SYST CO LTD
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