Energy-saving high-salt wastewater treatment system and treatment method

Abstract

The invention discloses an energy-saving high-salt wastewater treatment system and treatment method. The system comprises a forward-osmosis salt concentrating device and a multi-effect evaporator, wherein the forward-osmosis salt concentrating device comprises an FO membrane closed exchange box, an absorbing liquid recycling device and a fresh water recycling device; at least one stage of FO membrane closed exchange box is arranged; the absorbing liquid recycling device is respectively connected with each stage of FO membrane closed exchange box through electric valves; the fresh water recycling device is connected with the absorbing liquid recycling device; all stages of FO membrane closed exchange boxes are sequentially connected through liquid discharging electric valves and all connected with a multi-effect mother liquor evaporator through overrunning electric valves. According to hyperosmosis character of the high-salt wastewater and due to preparation of the absorbing liquid with higher colligative properties and utilization of osmotic pressure difference caused by difference of the colligative properties, the method can be used for efficiently concentrating the high-salt wastewater as well as recycling water resource to generate electric energy; automatic interlock control is realized during a running process, and the running mode can be regulated according to different water charging conditions.

Description

technical field [0001] The invention relates to a treatment system for high-salt wastewater and a treatment method thereof, belonging to the technical field of wastewater treatment. Background technique [0002] Saline wastewater includes saline domestic sewage, saline industrial wastewater and other saline wastewater. Hypersaline wastewater is wastewater containing organic matter and at least 3.5% (mass concentration) of total dissolved solids (TDS). High-salt wastewater comes from a wide range of sources. One is from various industrial production processes such as chemical industry, pharmaceuticals, petroleum, printing and dyeing, papermaking, dairy product processing, and food canning; Fire etc. [0003] The organic matter in high-salt organic wastewater varies greatly depending on the production process, and the types and chemical properties of the organic matter are quite different, but most of the salts contained are Cl - , SO 4 2- 、Na + , Ca 2 + and other sal...

AI Technical Summary

Problems solved by technology

[0007] In addition, currently commonly used physical and chemical treatment methods for high-salt wastewater, such as electrolysis, incineration, evaporation, membrane distillation, and advanced oxidation, all have shortcomings such as high energy consumption, high cost, and secondary pollution to varying degrees.

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