Nanofiltration membrane blending based high salinity wastewater zero discharge processing method and device

A technology of high-salt wastewater and treatment device, applied in the field of water treatment, can solve problems such as the enrichment of salt-containing wastewater, and achieve the effects of reducing the amount of mother liquor, wide adaptability, and realizing resource utilization.
CN108623104APending Publication Date: 2018-10-09NANJING UNIV OF TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF TECH
Publication Date
2018-10-09

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Abstract

The invention relates to a nanofiltration membrane blending based high salinity wastewater zero discharge processing method, and a device. The nanofiltration membrane blending based high salinity wastewater zero discharge processing method mainly comprises following steps: high salinity wastewater is delivered through a pretreatment system for impurity removing, salt extraction concentration, andsoftening; softened concentrated water is introduced into a nanofiltration blending system for blending of the concentrations of monovalent and divalent salts, so that the monovalent salt to divalentsalt concentration ratio is controlled to be 0.01 to 0.1; concentrated water discharged from the nanofiltration blending system is introduced into a sodium sulfate crystallization system for processing so as to obtain divalent salt products capable of satisfying industrial salt requirements and a sodium chloride-containing mother liquor; an obtained nanofiltration blending system penetrating fluidis delivered through an extraction concentration system, and is introduced into a sodium chloride crystallization system so as to obtain sodium chloride salt products and a sodium sulfate-containingmother liquor; the sodium chloride crystallization mother liquor is subjected to impurity removing, and is introduced into the sodium sulfate crystallization system; the sodium sulfate crystallizationmother liquor is subjected to impurity removing, and is introduced into the sodium chloride crystallization system. The nanofiltration membrane blending based high salinity wastewater zero dischargeprocessing method is capable of realizing wastewater zero discharge, and stabilizing salinity fluctuation in the crystallization systems.
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Description

technical field

[0001] The invention relates to a zero-discharge treatment method and device for high-salt wastewater based on nanofiltration membrane preparation, and belongs to the technical field of water treatment. Background technique

[0002] The wastewater discharged from the paper industry, printing and dyeing industry, chemical industry, pharmaceutical industry, etc. contains a certain concentration of inorganic salts. The process of zero discharge of wastewater involves the process of how to separate inorganic salts from wastewater. Aiming at the zero discharge of salty wastewater, advanced oxidation pretreatment is used to reduce COD and SS. On this basis, reverse osmosis membrane is used for concentration. As the concentration ratio increases, the hardness of wastewater also gradually increases. The concentrated wastewater can use the "two alkali method" or "resin softening method" to remove the hardness in the wastewater. After the hardness-removed wastewater...

Claims

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