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Recovery processing method of 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, water/sewage multi-stage treatment, etc. , to achieve the effect of resource utilization, simple and stable process conditions

Inactive Publication Date: 2015-10-14
SHIJIAZHUANG GONGDA CHEM EQUIP
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Problems solved by technology

However, the solids precipitated by the evaporative desalination method are all mixed salts containing multiple salts at the same time. The purity is low and cannot be reused in industry. Usually, the mixed salts are discarded directly or handed over to hazardous waste treatment institutions for a fee of 300-1000 tons per ton. The price of 5,000 yuan is professionally treated, 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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  • Recovery processing method of high salinity wastewater containing sodium chloride and sodium sulfate
  • Recovery processing method of high salinity wastewater containing sodium chloride and sodium sulfate

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Embodiment 1

[0056] The technological process of this embodiment is as figure 2 As shown, a three-effect co-current evaporation process was adopted.

[0057] In this embodiment, the primary evaporation and crystallization adopts a double-effect downstream process; the first-effect evaporator adopts a falling film evaporator, including a first-effect separation chamber 3 and a first-effect heating chamber 2; the second-effect evaporator adopts a forced circulation evaporation crystallizer, including Two-effect crystallization separator 5 and two-effect heating chamber 4. Barium chloride is added in the primary mother liquor pool 7 to remove sulfate ions. The secondary evaporation crystallizer adopts a single-effect forced circulation evaporator, and the secondary evaporation crystallizer includes a three-effect crystallizer separator 11 and a three-effect heating chamber 10 .

[0058] Material flow direction:

[0059] A. One evaporation crystallization

[0060] The high-salt wastewater...

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Abstract

The invention discloses a recovery processing method of high salinity wastewater containing sodium chloride and sodium sulfate, and belongs to the field of industrial wastewater treatment. According to the recovery processing method, sodium chloride and sodium sulfate are recycled via primary evaporative crystallization, removing of sulfate ions via adding of materials and generation of precipitations, and secondary evaporative crystallization. The recovery processing method can be used for effective recovery of sodium chloride and sodium sulfate in coal chemical industry high salinity wastewater; process conditions are simple and stable; the recovery processing method is convenient for industrialized popularization; recovered sodium chloride and sodium sulfate are capable of satisfying quality requirements of industrial-grade products, and can be recycled and reused directly or be sold as by-products; processing of high salinity wastewater is realized; environmental requirements are satisfied; waste is changed into valuables; salt resource utilization is realized; and factory income is increased.

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 in the coal chemical industry. Background technique [0002] A large amount of sewage is discharged during the coal chemical production process. In addition to organic matter, these sewage also contain 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] The treatment technology of high-salt wastewater has been studied for decades at home and abroad, and the methods commonly used at present mainly include biological method, SBR process method and evaporation desalination method. Among the many high-salt wastewater treatment technologies, the evaporative desalination ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/04C01D5/00
CPCY02W10/37
Inventor 张继军
Owner SHIJIAZHUANG GONGDA CHEM EQUIP
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