Chemical treatment method of industrial wastewater

Chemical wastewater mainly comes from production wastewater discharged from petrochemical industry, coal chemical industry, acid-base industry, fertilizer industry, plastic industry, pharmaceutical industry, dye industry and rubber industry. The main measures for the prevention and control of chemical wastewater pollution are as follows: first, reform production technology and equipment, reduce pollutant discharge, prevent wastewater from being discharged, and comprehensively utilize and recycle; The treatment degree of wastewater that must be discharged should be selected according to the water quality and requirements. Primary treatment is mainly to separate suspended solids, colloids, oil slick or heavy oil from water. Methods such as water quality and quantity adjustment, natural sedimentation, floating and oil separation can be adopted.

Chemical wastewater treatment method

Secondary treatment is mainly to remove biodegradable organic soluble substances and part of colloid, and reduce biochemical oxygen demand and part of chemical oxygen demand in wastewater. Biological treatment is usually adopted. After biological treatment, there is still a considerable amount of COD in wastewater, sometimes with high color, fragrance and taste, or because of the high requirements of environmental hygiene standards, it is necessary to adopt the three-stage treatment method for further purification. Tertiary treatment is mainly to remove organic pollutants and dissolved inorganic pollutants that are difficult to biodegrade in wastewater. Commonly used methods include activated carbon adsorption and ozone oxidation, and ion exchange and membrane separation techniques can also be used. Various chemical wastewater can be treated by different methods according to different water quality and quantity and the requirements of treated effluent quality.