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Recycling method of high-salinity wastewater

A high-salt wastewater recycling and treatment technology, applied in energy wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of non-reuse, increased wastewater treatment cost, and low purity. Achieve the effect of realizing recycling, realizing resource utilization, and simple and stable process conditions

Active Publication Date: 2015-05-06
SHIJIAZHUANG GONGDA CHEM EQUIP +1
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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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  • Recycling method of high-salinity wastewater
  • Recycling method of high-salinity wastewater

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Experimental program
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Embodiment 1

[0057] The technological process of this embodiment is as figure 2 As shown, a three-effect co-current evaporation process was adopted.

[0058] 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 5 and a first-effect heating chamber 4; the second-effect evaporator adopts a forced circulation evaporation crystallizer, including Two-effect crystallizer 7 and two-effect heating chamber 6. The cooling and crystallization adopts a jacketed cooling stirring tank, and the refrigerant adopts frozen brine. The secondary evaporation crystallizer adopts a single-effect forced circulation evaporator, and the secondary evaporation crystallizer includes a three-effect separation chamber 16 and a three-effect heating chamber 15 .

[0059] Material flow direction:

[0060] A. One evaporation crystallization

[0061] The high-sal...

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Abstract

The invention discloses a recycling method of high-salinity wastewater. Sodium sulfate and sodium chloride are recycled through three steps of primary evaporative crystallization, cooling crystallization and secondary evaporation crystallization. According to the method disclosed by the invention, sodium sulfate and sodium chloride in the high-salinity wastewater of coal chemical industry can be effectively recycled; the method is simple and stable in technological conditions; industrial popularization is facilitated; the recycled sodium sulfate and sodium chloride meet the quality requirements of industrial products, and can be directly recovered and applied mechanically or sold as byproducts, so that the target of treating the high-salinity wastewater is reached; the requirements of the current environment-friendly situation are met; waste is changed into treasures; resource utilization of salts is achieved; and benefits of factories are improved.

Description

Technical field [0001] The invention relates to a wastewater treatment method, in particular to a recovery and treatment method of high-salt wastewater 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 sewages also contain a large amount of salts. Coal chemical industry wastewater undergoes biochemical treatment to reduce organic matter and filtration 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. [0003] The treatment technology of high-salt wastewater has been studied at home and abroad for decades. Currently, the commonly used methods mainly include biological methods, SBR technology and evaporative desalination methods. Among the many high-salt wastewater treatment technologies, evaporative desalination has the...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/06C01D5/00
CPCY02W10/37
Inventor 张继军武彦芳郭雅妹王国清张俊岭
Owner SHIJIAZHUANG GONGDA CHEM EQUIP
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