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Process and system for refining salt by using high-salinity wastewater

A high-salt wastewater and refined salt technology, applied in water softening, alkali metal sulfite/sulfite, water/sewage treatment, etc., can solve high energy consumption, easy scaling, low salt yield and purity And other issues

Pending Publication Date: 2021-05-18
肥城胜利盐业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of high energy consumption, easy scaling, and relatively low salt yield and purity in the existing high-salt wastewater treatment technology, the present invention provides a process for refining salt by using high-salt wastewater, which can reduce production capacity On the basis of low consumption, the recovery rate and purity of the product salt are greatly improved

Method used

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  • Process and system for refining salt by using high-salinity wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiments of the present invention provide a process for refining salt using high-salt wastewater, such as figure 1 As shown, the system used in this process includes softening clarifier 1, ozone bio-carbon filter 2, decarbonization tower 3, MVR evaporator 4, ED concentration device 5, double-stage nanofiltration equipment 6, double-stage nanofiltration Equipment 6 is connected with sodium chloride crystallizer 7 and sodium sulfate crystallizer 8.

[0021] The process specifically includes the following steps:

[0022] (1) Pretreatment: High-salt wastewater first enters the softening and clarifying tank 1 for softening and clarification. After clarification, it enters the ozone bio-carbon filter 2 for ozone catalytic oxidation, biodegradation and adsorption, and activated carbon adsorption, and then enters the decarbonization tower 3 for decarbonization treatment.

[0023] (2) Concentration: The pretreated waste water first enters the MVR evaporator 4 for pre-concen...

Embodiment 2

[0028] Embodiments of the present invention provide a process for refining salt using high-salt wastewater, such as figure 1 As shown, the system used in this process includes softening clarifier 1, ozone bio-carbon filter 2, decarbonization tower 3, MVR evaporator 4, ED concentration device 5, double-stage nanofiltration equipment 6, double-stage nanofiltration Equipment 6 is connected with sodium chloride crystallizer 7 and sodium sulfate crystallizer 8.

[0029] The process specifically includes the following steps:

[0030] (1) Pretreatment: High-salt wastewater first enters softening and clarification tank 1 for softening and clarification. The pH value of softening and clarification is controlled at 9.5. After clarification, it enters the ozone bio-carbon filter 2 for ozone catalytic oxidation, biodegradation and adsorption, and activated carbon adsorption, and then enters the decarbonization tower 3 for decarbonization treatment.

[0031] (2) Concentration: The pretre...

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Abstract

The invention belongs to the technical field of wastewater treatment, and relates to a process and system for refining salt by using high-salinity wastewater. The process comprises the following steps of: pretreating the high-salinity wastewater; pre-concentrating the pretreated wastewater through an MVR mechanical vapor recompression technology; concentrating the wastewater through an ED ionic membrane after pre-concentration; enabling the wastewater to enter a two-stage nanofiltration system to complete separation of sodium chloride and sodium sulfate; and preparing the sodium chloride and sodium sulfate through cooling crystallization. The system comprises a softening clarification tank, an ozone biochar filter tank, a decarbonization tower, an MVR evaporator, an ED concentration device and two-stage nanofiltration equipment which are connected in sequence, wherein the two-stage nanofiltration equipment is connected with a sodium chloride crystallizer and a sodium sulfate crystallizer. On the basis of reducing the production energy consumption, the recovery rate and the purity of product salt are greatly improved, and the resource utilization of the high-salt wastewater is realized.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a process and a system for refining salt by using high-salt waste water. Background technique [0002] High-salt wastewater refers to wastewater with a total salt content greater than 1%, which mainly comes from industrial production processes such as papermaking, printing and dyeing, chemical industry, and oil and gas collection and processing. According to different production processes, organic matter in high-salt wastewater contains large differences in the types and chemical properties of organic matter, but most of the salts contained are Cl - , SO 4 2- 、Na + , Ca 2+ It is very important to remove organic pollutants in high-salt wastewater and reduce its impact on the environment. [0003] At present, the technologies commonly used to treat high-salt wastewater include incineration, electrodialysis, membrane separation, biological treatment, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06C01D5/00C02F9/14C02F1/04C02F1/28C02F1/44C02F1/469C02F1/78C02F3/00C02F5/06
CPCC01D3/06C01D5/00C02F9/00C02F1/041C02F1/4693C02F1/442C02F1/283C02F1/78C02F3/00C02F5/06C01P2006/80
Inventor 张刚贾启庞学雷杨希清周兆凯
Owner 肥城胜利盐业有限公司