The research focuses on the technical principles of arsenic species transformation and process control, and develops a reduction-coprecipitation efficient arsenic removal technology based on arsenic species control. By following the trend, taking advantage of the high acidity characteristics of wastewater produced by the production of sulfuric acid, taking advantage of the reduction of pentavalent arsenic by sulfides and the efficient removal of trivalent arsenic, and the characteristics of the generated precipitate having large particle size and easy separation, the generated precipitate is solid-liquid separated by pressure water purifiers or the like. Compared with traditional technologies, the dosage is more than 40% lower, the sludge production is reduced by more than 70%, the arsenic content ratio of sludge is more than 20%, and the arsenic concentration in effluent is less than 100 mg/L. Developed a pressure-type cyclonic multiphase reaction that achieves rapid transformation of arsenic species and a cyclonic solid-liquid separation integrated complete set of equipment that promotes the separation of particulate arsenic. The reactor has easy control of the flow state, high reaction or separation efficiency, low equipment energy consumption, and simple installation and maintenance., automatic operation and other advantages. Pressure-type cyclone multiphase reactors and other related equipment have been used in electroplating wastewater and acrylonitrile wastewater treatment projects (with a total scale of 200 tons/day) and in the enhanced arsenic removal renovation projects of two water plants in Inner Mongolia (20,000 tons/day).

 The dosing cost is 11.2 yuan/m3, and the electricity consumption per ton of water is 2.2 yuan; the basic cost is less than 15 yuan/m3. On the premise that the arsenic concentration in the inlet water is 1,500 ~ 2,500 mg/L, the arsenic concentration in the outlet water can be stabilized below 100mg/L to achieve the purpose of reuse. Wastewater reuse and resource recovery of heavy metals in wastewater can be realized. It has good application prospects in the fields of arsenic-containing wastewater treatment in arsenic-related industries such as hydrometallurgy, phosphorus chemicals, and semiconductors, as well as refractory organic wastewater and heavy metal wastewater treatment, and can effectively promote the industrialization of my country's environmental protection equipment and enhance the core competitiveness of the industry.