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Recovery and treatment method for high-salinity wastewater containing sodium chloride and sodium sulfate

A high-salt wastewater, recycling and treatment technology, applied in the direction of energy wastewater treatment, chemical instruments and methods, multi-stage water treatment, etc., can solve the problems of inability to reuse, increase the cost of wastewater treatment, low purity, etc., and reduce the cost of wastewater treatment , Realize the effect of resource utilization and simple and stable process conditions

Inactive Publication Date: 2018-04-13
SHIJIAZHUANG GONGDA CHEM EQUIP
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  • Application Information

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

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example 1

[0055] The technological process of this embodiment is as figure 2 As shown, the two-effect co-current evaporation process is adopted.

[0056] In this embodiment, the evaporation and crystallization of the retained liquid adopts a double-effect downstream process; the first-effect evaporator adopts a falling-film evaporator, including a first-effect separation chamber B11 and a first-effect heating chamber B10; the second-effect evaporator adopts a forced circulation evaporation crystallizer, Including the second-effect crystallizer B13 and the second-effect heating chamber B12. 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 ...

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Abstract

The invention discloses a recovery and treatment method for high-salinity wastewater containing sodium chloride and sodium sulfate, belonging to the field of treatment of industrial wastewater. According to the method, a nanofiltration membrane is used for filtering; a filtrate permeating the nanofiltration membrane is subjected to evaporative crystallization so as to obtain sodium chloride; a trapped fluid not permeating the nanofiltration membrane is subjected to evaporative crystallization so as to obtain sodium sulfate; and primary mother liquor is returned to a system and mixed with raw materials for cyclic usage. The method can effectively recover and utilize sodium sulfate and sodium chloride in the high-salinity wastewater, achieves the purpose of treating the high-salinity wastewater, meets current requirements of environmental protection, turns the waste into the valuable, realizes recycling of salts and increases the profits of factories.

Description

[0001] This application is a divisional application of the Chinese application submitted on June 30, 2015 with the application number 201510375661.7 and the title of the invention is "Method for the recovery and treatment of high-salt wastewater containing sodium chloride and sodium sulfate". technical field [0002] 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. Background technique [0003] 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 sulfide, and trace amounts of other salts, which is usually called high-salt wastewater. [0004] The treatment tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D5/16C01D3/14C01D3/06C02F101/12C02F101/10
CPCC01D3/06C01D3/14C01D5/16C02F1/043C02F1/048C02F1/283C02F1/442C02F1/725C02F9/00C02F2101/101C02F2101/12C02F2301/08Y02W10/37
Inventor 张继军
Owner SHIJIAZHUANG GONGDA CHEM EQUIP
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