Process for advanced treatment of electroplating waste by integrated membrane

Abstract

The invention discloses an integrated film deep processing electroplating waste water technology which has the following technical procedures: complexation and pH value regulation are carried out to electroplating waste water; primary filtration is carried out to the electroplating waste water by a fine-filtration filter and a safety filter; the electroplating waste water enters a hollow super-filtration film; the electroplating waste water is pressurized and enters a nano-filtration reverse osmosis film to carry out first-stage concentration; permeating liquid enters a permeating liquid tank; after being pressurized, the electroplating waste water in the permeating liquid tank returns to a cleaning tank by an brackish water reverse osmosis film; after being pressurized, the concentrated liquid enters the permeating liquid tank, the permeating liquid enters the permeating liquid tank, and the concentrated liquid is further pressurized to enter the brackish water reverse osmosis film for second-stage concentration; the permeating liquid after the second-stage concentration returns to the inlet of the alkali reverse osmosis film, and after being further pressurized, the concentrated liquid enters a seawater desalting reverse osmosis film for third-stage concentration; the permeating liquid after the third-stage concentration returns to the inlet of the seawater desalting reverse osmosis film, and the concentrated liquid returns to the electroplating tank to be used as electroplating supplementary liquid. The invention avoids the second environmental pollution, and realizes the zero discharge of the electroplating waste water.

Description

technical field [0001] The invention relates to a process for treating wastewater, in particular to a process for treating electroplating wastewater. Background technique [0002] After half a century of development, my country's electroplating wastewater treatment technology has gradually diversified, from the initial chemical method and electrolytic reduction method to the coexistence of multiple technologies such as ion exchange method and microbial method. Problems: (1) The cost is too high - water cannot be recycled, and water and sewage treatment fees account for 15% to 20% of the total production cost; (2) Resource waste - precious metals are discharged into water bodies and cannot be recycled; ( 3) Environmental pollution - the heavy metals in electroplating wastewater are "permanent pollutants", which are transferred and accumulated in the biological chain, eventually endangering human health. At present, ion exchange treatment is widely used in domestic electroplati...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a process for advanced treatment of electroplating wastewater with integrated membranes, which can effectively solve the problems of secondary pollution of the environment caused by existing processes and the inability to recycle heavy metals, and realize zero discharge of electroplating wastewater

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