Method for treating epichlorohydrin waste water

Abstract

The invention discloses a method for treating epichlorohydrin waste water. The method comprises the following steps: degrading organic pollutants by adopting ABR anaerobic treatment / BAC aerobic treatment / MBR aerobic treatment; for MBR effluent water, treating surplus organic compounds through combined usage of deep oxidation of an oxidizer and adsorption with activated carbon; for deep oxidation effluent water, performing electrodialysis concentration, performing MVR evaporation concentration on electrodialysis concentration liquid, using MVR condensate as dilution water, enabling an MVR concentrated solution to reach to the standard of ion film caustic soda for recycling; and performing reverse osmosis on electrodialysis light liquid for desalting, using reverse osmosis light liquid as dilution water for recycling, and enabling reverse osmosis strong liquid to return to a deep oxidation technology. Clean water produced in the whole technology of the method disclosed by the invention is completely used as dilution water, inorganic salts in the epichlorohydrin waste water can be completely recycled to be used for an ion film caustic soda technology, the purpose of resource utilization of water and salts is achieved, the whole technology is effective to implement, the operation is flexible and convenient, the resource utilization of the water and the salts for the epichlorohydrin waste water can be achieved, discharge is not needed, and no adverse effect on environment is generated.

Description

technical field [0001] The invention belongs to the field of sewage treatment methods, in particular to a method for treating epichlorohydrin wastewater. Background technique [0002] Epichlorohydrin is an important organic chemical raw material and fine chemical product. At present, there are four industrial production methods: high temperature chlorination of propylene, propylene acetate, acrolein and glycerol chlorination. [0003] Among them, the glycerol chlorination method has the advantages of using glycerol of renewable resources as raw material, no longer using chlorine and sodium hypochlorite in the production process, reducing environmental pollution, mild reaction conditions, and high yield of 1,3-dichloropropanol. Gaining importance. The main process route of the glycerol chlorination method is to react under the action of glycerol, hydrogen chloride and a catalyst to generate dichloropropanol; dichloropropanol is cyclized and saponified in an alkaline solution...

AI Technical Summary

Problems solved by technology

However, this method is only applicable to the production process using calcium hydroxide solution in the ring-closing saponification section, and the ammonium chloride generated by the first step reaction remains in the water body, and the ammonium chloride recovered by reverse osmosis concentration contains organic matter

Therefore, the water obtained by this treatment method will still affect the recycling

[0006] In the prior art methods for resource utilization of salt and water in epichlorohydrin wastewater, there are deficiencies such as high treatment cost, cumbersome treatment process, potential safety hazards, or ineffective resource utilization of treated wastewater. Therefore, it has been a technical problem to be solved by those skilled in the art to design a method that is easy to operate, has a high safety factor and low treatment cost, and can make effective use of the treated wastewater.

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