A comprehensive treatment process for high-concentration and high-salt wastewater

Abstract

The invention relates to a wastewater treatment process, and provides a comprehensive treatment process for high-concentration and high-salt wastewater, comprising the following steps: concentrating the wastewater, adding an organic flocculant, and settling large particles of impurities and most of the suspended matter and floating matter; Add activated carbon adsorbent to adsorb organic matter; filter to remove particulate impurities, colloidal substances and suspended solids in water, and then separate monovalent ions in wastewater through primary nanofiltration; water containing monovalent ions undergoes reverse osmosis to obtain pure Water can be used as industrial water; Concentrated water undergoes electrodialysis to concentrate monovalent salts to obtain NaCl by-products; Water containing divalent ions undergoes freezing and crystallization, and after centrifugation, the crystal layer undergoes double-stage membrane electrodialysis to obtain acid-base products. The water layer is treated by nanofiltration; the saturated adsorbent that has absorbed organic matter is dehydrated and dried for recycling. The invention has low cost, can simultaneously remove organic matters and inorganic salts in waste water and utilize them, and is energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a comprehensive treatment process for high-concentration and high-salt wastewater. Background technique [0002] The research on the treatment of high-concentration chemical wastewater has always been the focus of research at home and abroad. At present, the treatment methods at home and abroad mainly include traditional biological methods such as biofilm method and activated sludge method, which have a certain removal effect on organic matter in wastewater and can reduce COD content in wastewater, but cannot be desalinated, the toxicity of sewage will also seriously inhibit the normal metabolic function of microorganisms, making it difficult to carry out biochemical reactions; traditional evaporation processes, such as distillation, and multi-effect vacuum evaporation and low-temperature flash evaporation developed from distillation , high-pressure spray evaporation and other pr...

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Problems solved by technology

[0002] The research on the treatment of high-concentration chemical wastewater has always been the focus of research at home and abroad. At present, the treatment methods at home and abroad mainly include traditional biological methods such as biofilm method and activated sludge method, which have a certain removal effect on organic matter in wastewater and can reduce COD content in wastewater, but can not be desalinated, the toxicity of sewage will also seriously inhibit the normal metabolic function of microorganisms, making it difficult to carry out biochemical reactions; traditional evaporation processes, such as distillation, and multi-effect vacuum evaporation and low-temperature flash evaporation developed from distillation , high-pressure spray evaporation and other processes, these processes mainly have disadvantages such as large investment, high energy consumption, low efficiency, high operating costs and difficult maintenance, and are difficult to popularize; the electrode plate of the electrochemical method is easily passivated, corroded, consumes a lot of power, and is difficult to handle. The effect is not stable enough, and the amount of sludge is large; the chemical oxidation method requires a lot of supporting equipment, which usually cannot be used alone, and the equipment is expensive and the cost is high

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