1、 Scope of application

Mainly suitable for electroplating hexavalent chromium cleaning wastewater, roughening cleaning wastewater, chromic acid passivation, and other main component hexavalent chromium wastewater

2、 Main technical indicators

The inlet water quality requires hexavalent chromium to be less than 2000mg1, and the outlet water quality can meet the requirements of Table 3 of GB21900-2008 "Emission Standards for Electroplating Pollutants", which requires hexavalent chromium to be less than 0.1mg and total chromium to be less than 0.5mg.

3、 Key technologies or innovation points

The Xihai Environmental Protection Separation and Purification System fully utilizes the characteristics of ultrafiltration membranes, microfiltration membranes, sodium filtration membranes, RO membranes, various ion selective permeable membranes, and various ion selective exchange resins. It adopts unique process technology, information technology, intelligent control system hardware and software, and system integration into modular environmental protection equipment.

4、 Technical characteristics and progressiveness

（1） In the hexavalent chromium recycling technology, ion selective exchange resin has a long service life, can be used stably for a long time, and has no scrap problem. Solved the problem of traditional ion exchange resins, which are prone to aging and failure, have a short service life, and become hazardous waste after failure, resulting in high costs for entrusted treatment.

（2） In the hexavalent chromium recovery technology, the ion selective exchange resin does not generate any new wastewater discharge during the regeneration process, saving the amount of regeneration agents used. Solved the problem of generating a large amount of wastewater during the regeneration process of traditional ion exchange resins, increasing the burden of wastewater treatment and wasting chemical agents.

（3） This technology adopts an intelligent networked fully automatic processing and regeneration system during operation, with standardized operation. This reduces the difficulty of operational techniques, lowers labor costs, and ensures more stable and reliable operation. Solved the traditional problems of high process complexity, manual waste, high operational difficulty, and unstable operation in the treatment of sub exchange resin.