High-salinity sewage treatment process

Abstract

The invention discloses a high-salinity sewage treatment process. The process comprises the following steps: firstly, collecting high-salinity sewage of each shift generated in a workshop into a watercollecting tank, and buffering and balancing water quality; then carrying out biochemical treatment in a biochemical system; then introducing the biochemically treated sewage into a sedimentation tank for sedimentation treatment, pumping the settled sludge into a filter press through a sludge reflux pump for filter pressing, recovering clear water obtained after filter pressing into a water collecting tank for cyclic treatment again, introducing the settled sewage into an MBR membrane tank for filtration, carrying out reverse osmosis desalination to generate desalinated water and strong brine, then cooling desalted water and strong brine generated after reverse osmosis desalination by adopting an energy-saving water temperature heat pump, recovering heat, and applying the heat to a biochemical system; and disinfecting the cooled desalted water by electrolyzing sodium hypochlorite. The disinfected water can be completely recycled as tap water, and can also be directly discharged. Hazardous waste is not generated, zero emission and no pollution are achieved, strong brine and desalted water are recycled, cooled through a heat pump and recycled, and finally the desalted water is introduced into a good water system and completely recycled.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a high-salt sewage treatment process. Background technique [0002] There is a large demand for pickled vegetables in the market, and many pickled vegetable factories have been built in China. During the processing of pickled vegetables, a large amount of high-salt wastewater is generated. The pickled vegetable wastewater has the characteristics of high salt, high COD, and high ammonia nitrogen. According to the level of salinity, it can be divided into two categories: high-salt wastewater and ultra-high-salt wastewater, high-salt wastewater with an influent salinity below 30,000 ppm, and ultra-high-salt wastewater with an influent salinity above 30,000 ppm. The traditional biochemical treatment of high-salt sewage can only solve the problems of COD and ammonia nitrogen, but cannot solve high-salt pollution. For this reason, some enterprises use multi-effect evaporation...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a high-salt sewage treatment process, which can remove and utilize salt in addition to solving COD and ammonia nitrogen, and adopts reverse osmosis membrane filtration for the previous pickle sewage treatment The generated desalinated water and concentrated brine are too hot to be reused, and the water temperature of the biochemical system is low, resulting in insufficient bacterial activity.

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