Crystallization treatment method and device of high salt wastewater

A crystallization treatment, high-salt technology, applied in the field of water treatment, can solve problems such as increasing operating costs and increasing system energy consumption

Active Publication Date: 2015-06-10
INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The centrifuge mother liquor of MVR technology can theoretically achieve full circulation in the system, but because the ionic components contained in the wastewater are complex and not a single component, if the mother liquor is completely circulated, the final crystallization salt produce...

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  • Crystallization treatment method and device of high salt wastewater
  • Crystallization treatment method and device of high salt wastewater
  • Crystallization treatment method and device of high salt wastewater

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Embodiment

[0025] After the frozen and crystallized mother liquid A passes through the refrigeration system for many times, the discharged mother liquid A contains high sodium chloride content, which can be connected to the liquid inlet pipe of the MVR system through a pipeline, so that the mother liquid A can be mixed with sodium chloride concentrated water After mixing, they enter the MVR system together; the principle of the MVR system is to raise the temperature to the boiling point of water and evaporate the water from the system. Because of the principle of saturated solution, crystallized salt will be precipitated from the system; the salt slurry from MVR will be produced by high-speed centrifugation Centrifuge mother liquor B. At this time, the centrifugal mother liquor B needs to be discharged from the system, and the discharged centrifugal mother liquor B enters the freeze crystallization system again through the pipeline connected to the liquid inlet of the crystallization tank ...

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Abstract

The invention relates to a crystallization treatment method and device of high salt wastewater and belongs to the technical field of water treatment. The method is characterized in that after sodium sulfate concentrated water is treated by a freezing crystallization system, generated mother liquor A enters into an MVR system for evaporative crystallization; after sodium chloride concentrated water is treated by the MVR system, generated mother liquor B enters into a freezing crystallization system for freezing crystallization, and the mother liquor can be treated in a circulation overlapping manner; a drain outlet of the MVR system of the device is connected with a liquid inlet of a crystallization tank in the freezing crystallization system through a pipeline and the drain outlet of the freezing crystallization system is connected with a liquid inlet pipe of the MVR evaporative crystallization system. The method has the advantages that the mother liquor is treated by a freezing crystallization technology and an MVR evaporation crystallization technology in a circulation overlapping manner, so that the problems of zero emission and resource utilization are solved, and therefore, the energy consumption is effectively reduced and the operating cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method and a device for treating mother liquor in a cycle of freezing crystallization and MVR evaporation crystallization. Background technique [0002] Freezing and crystallization technology is a technology that lowers the temperature of wastewater to about 0°C by freezing, and crystallizes wastewater based on the principle that the solubility of certain compounds in water is highly sensitive to temperature. The centrifuged mother liquor of freeze crystallization technology can only be partially circulated in the freeze crystallization system, because the water may contain some substances whose solubility does not change significantly with temperature. If the mother liquor is fully circulated, these substances will be enriched in the system and form dead Circulation, so part of the centrifuged mother liquor needs to be discharged from the system. [0003]...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/06C01D5/16
Inventor 杭天浜赛世杰王俊辉刘慧刘丹茹孟庆军李思序李乐郭默然姚红锐
Owner INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH
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