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Separation and reuse method of sodium sulfate from high salinity wastewater

A high-salt wastewater, sodium sulfate technology, applied in chemical instruments and methods, alkali metal sulfite/sulfate purification, water pollutants, etc. Contains toxic and harmful substances and other problems, to achieve the effect of reducing high costs, stable operation and reasonable process

Inactive Publication Date: 2017-03-22
JIANGSU XINYU TIANCHENG ENVIRONMENTAL PROTECTION ENG
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Problems solved by technology

At present, the domestic technology for treating high-salt wastewater is mainly the direct evaporation and crystallization method, but the solid miscellaneous salt produced after evaporation and crystallization has complex components and contains toxic and harmful substances, so it can only be treated as hazardous waste
This will not only easily cause secondary pollution to the environment, but also cause high hazardous waste disposal costs to enterprises.

Method used

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  • Separation and reuse method of sodium sulfate from high salinity wastewater
  • Separation and reuse method of sodium sulfate from high salinity wastewater

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Embodiment

[0024] The sodium sulfate of an industrial high-salt wastewater after pretreatment is 2.2×10 4 mg / L, other about 0.3×10 4 mg / L (nitrate and ammonium salt), the high-salt wastewater 1000kg is first passed through a high-pressure nanofiltration membrane treatment device to obtain a concentrated solution of about 200kg. The concentrate contains sodium sulfate-based inorganic salts and most of the organic matter intercepted in high-salt wastewater. The organic matter is removed through advanced oxidation treatment, so that the CODcr is less than 500mg / l, and then enters the divalent salt evaporation crystallization system. During the evaporation process After the water vapor is turned into condensed water, it is used as reuse water, and about 10% of the mother liquor is returned to the front-end nanofiltration membrane treatment equipment for further separation. After crystallization, 31 kg of solid salt with a water content of about 30% was obtained, and after drying, 21.8 kg of...

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Abstract

The invention relates to a separation and reuse method of sodium sulfate from high salinity wastewater. Divalent salts and organic matters are separated from monovalent salts by means of nanofiltration membrane characteristics to remove a great amount of organic matters in wastewater, then evaporation concentration and crystallization steps are carried out to obtain a sodium sulfate solid with few impurity. The method has the characteristics of reasonable process, resource recovery, economical efficiency and high efficiency, and stable operation, can be used as an advanced treatment technology to effectively remove organic matter and inorganic salt based total dissolved solids (TDS) from high salinity wastewater, at the same time acquires the sodium sulfate solid with few impurity, can well make up for the shortcomings of existing high salinity wastewater treatment technology, and makes the high salinity concentrated solution treatment reach the purpose of "zero emission of solid and liquid".

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for separating and recycling sodium sulfate in high-salt wastewater. Background technique [0002] Industrial wastewater contains a large amount of toxic and harmful substances such as phenols, hydrocarbons, oil, and heavy metals. Organic pollutants in wastewater include phenols, polycyclic aromatic compounds, and heterocyclic compounds containing nitrogen, oxygen, and sulfur. Industrial wastewater with refractory organic matter. At present, the domestic technology for treating high-salt wastewater is mainly the direct evaporation and crystallization method, but the solid miscellaneous salt produced after evaporation and crystallization has complex components and contains toxic and harmful substances, so it can only be treated as hazardous waste. This will not only easily cause secondary pollution of the environment, but also cause high hazardous waste disposal costs for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D5/16C02F101/10
CPCC02F9/00C01D5/16C02F1/04C02F1/442C02F1/5236C02F1/56C02F1/722C02F1/78C02F2101/101C02F2301/046
Inventor 占坤朱小波
Owner JIANGSU XINYU TIANCHENG ENVIRONMENTAL PROTECTION ENG
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