Comprehensive treatment process of waste water high in concentration and high in salinity

Abstract

The invention relates to a comprehensive treatment process of waste water high in concentration and high in salinity. The process comprises the steps of centralizing the waste water, adding organic flocculant, and sedimentating large particle impurities and a large proportion of suspended matters and floating objects; adding activated carbon absorbent for absorbing organic matters; conducting filtration, removing granular impurities, colloidal substances and suspended matters in water, and then separating monovalent ions and divalent ions in the waste water through first-grade nanofiltration; making water containing the monovalent ions to be subjected to reverse osmosis, and obtaining pure water which can be used as industrial water; making concentrated water to be subjected to electrodialysis for concentrating monovalent salt, and obtaining NaCl accessory substances; making water containing the divalent ions to be subjected to freezing crystallization, conducting the centrifugation, making crystal body sections to be subjected to two-stage membrane electrodialysis, obtaining acid-alkali products, and making a water layer to be subjected to nanofiltration treatment; making the saturated absorbent which absorbs the organic matters to be subjected to dewatering and drying, and conducting the recycling. According to the comprehensive treatment process of the waste water high in concentration and high in salinity, the cost is low, the organic matters and inorganic salt in the waste water can be removed simultaneously and then utilized, energy is saved, and the environment is protected.

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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