Recycling method for high-salinity wastewater containing sodium chloride and sodium sulfate

A high-salt wastewater, recycling and treatment technology, applied in energy wastewater treatment, chemical instruments and methods, alkali metal sulfite/sulfate dehydration, etc., can solve problems such as increasing wastewater treatment costs, inability to reuse, and increasing environmental protection pressure. , to achieve the effect of resource utilization, reduction of treatment costs, and sudden reduction of environmental protection pressure

Inactive Publication Date: 2015-12-02
SHIJIAZHUANG GONGDA CHEM EQUIP
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

However, the solids precipitated by simple evaporative desalination methods are mixed salts containing multiple salts at the same time. The purity is low and cannot be reused in industry. They are usually discarded directly or handed over to hazardous waste treatment institutions for professional treatment at a higher price. treatment, which not only increases the pressure on environmental protection, but also greatly increases the cost of wastewater treatment in the factory

Method used

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  • Recycling method for high-salinity wastewater containing sodium chloride and sodium sulfate
  • Recycling method for high-salinity wastewater containing sodium chloride and sodium sulfate

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Embodiment

[0060] The technological process of this embodiment is as figure 2 As shown, the retentate evaporation and crystallization section adopts a double-effect downstream process; the first-effect evaporator adopts a falling-film evaporator, including a first-effect separation chamber B14 and a first-effect heating chamber B13; the second-effect evaporator adopts a forced circulation evaporation crystallizer, including Two-effect crystallizer B16 and two-effect heating chamber B15. The filtrate evaporation and crystallization section adopts a double-effect downstream process; the first-effect evaporator adopts a falling film evaporator, including a first-effect separation chamber A4 and a first-effect heating chamber A3; the second-effect evaporator adopts a forced circulation evaporation crystallizer, including a second-effect crystallization Device A6 and two-effect heating chamber A5.

[0061] Material flow direction:

[0062] A. Nanofiltration membrane filtration

[0063] Th...

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Abstract

The invention discloses a recycling method for high-salinity wastewater containing sodium chloride and sodium sulfate and belongs to the field of wastewater treatment. The method comprises: filtering wastewater through a nanofiltration membrane; performing evaporative crystallization on filtrate through the nanofiltration membrane to obtain sodium chloride and filtered mother liquor; performing evaporative crystallization on retained liquor which does not pass through the nanofiltration membrane to obtain sodium sulfate and retained mother liquor; mixing the filtered mother liquor with the retained mother liquor to obtain a mixture and adding fluosilicic acid into the mixture; and stirring sufficiently the mixture to obtain sodium fluosilicate by filtering. Filtered acid water is used in pH value adjustment of a system before biochemical treatment.

Description

technical field [0001] The invention relates to a method for treating waste water, in particular to a method for recycling and treating high-salt waste water containing sodium chloride and sodium sulfate, and belongs to the field of waste water treatment. Background technique [0002] In the process of coal chemical production, a large amount of sewage is discharged, which contains not only organic matter, but also a large amount of salt. Coal chemical wastewater is biochemically treated to reduce organic matter, and filtered to remove solid matter. The remaining wastewater mainly contains sodium sulfate, sodium chloride, and trace amounts of other salts, which is commonly referred to as high-salt wastewater. [0003] High-salt wastewater cannot be treated by biochemical methods, and the physical and chemical treatment process is relatively complicated, and the treatment cost is high. It is recognized as difficult-to-treat wastewater in the sewage treatment industry. If the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/04C01D5/18C01D5/16C02F101/12C02F101/10
CPCC01D3/04C01D5/16C01D5/18C02F9/00C02F1/001C02F1/38C02F1/04C02F1/442C02F1/5236C02F2101/101C02F2101/12C02F2001/5218C02F2301/08Y02W10/37
Inventor 张继军张俊岭
Owner SHIJIAZHUANG GONGDA CHEM EQUIP
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