According to the main pollutants in industrial wastewater containing chemical properties to the classification, it is divided into: organic pollutants containing mainly organic wastewater, wastewater containing inorganic inorganic contaminants, and with a mixture of organic and inorganic waste wastewater and contaminated cooling water is heated only containing radioactive substances and heavy metal waste. For example: food or waste oil processing of organic waste, and wastewater and electroplating wastewater processing minerals are inorganic waste. According to the industrial processing object classification, it can be divided into: Metallurgical waste, textile waste, wastewater, wastewater, wastewater, waste oil refining, processing industry, dyeing industry and the sugar industry.