Case Studies-Qinhuangdao Hongqisheng Precision Electronics Organic Wastewater Project

Project Description:

THongqisheng Precision Electronics (Qinhuangdao) Co., Ltd. was established in 1999 and is mainly engaged in designing, developing, manufacturing, and selling various printed circuit boards. The products are widely used in communication, computers, consumer electronics, and various 3C electronic products. The company uses advanced research and development technology and high-efficiency and low-cost operation methods to build a complete and rationally laid out PCB production, supply and marketing system, and has created a modern factory that is "efficient, rational, automated and unmanned". It has become one of the industry's most influential and essential manufacturers and enjoys an excellent reputation.

Project Results

The organic wastewater generated during the preparation and treatment of PCB circuit boards contains a lot of nickel. The chemical precipitation method balances the water quality and quantity of the nickel-containing wastewater, then passes through a pH adjustment tank with a pH value of about 3~4. Fenton reagent is added to the oxidation tank to convert the hypophosphite in the nickel-containing wastewater into orthophosphate to complete the wastewater decomposition. The wastewater is then introduced into an alkalization tank, and an aqueous solution of calcium hydroxide is added to generate nickel hydroxide and calcium phosphate precipitates. A polymer flocculant is added, and precipitation is carried out using a high-efficiency inclined plate sedimentation tank.