What is the pollution of industrial wastewater?

Industrial wastewater refers to sewage, sewage and liquid waste generated during the industrial production process, which contains industrial production materials, intermediate products and products lost with water, as well as as pollutants generated during the production process. With the rapid development of industry, the type and quantity of wastewater have increased rapidly, and the pollution of water bodies has become more and more widespread and serious, threatening human health and safety. Therefore, for environmental protection, industrial wastewater treatment is more important than urban wastewater treatment. Industrial water pollution is the main source of pollution of water bodies. This is wastewater used in the production process discharged by industrial companies. Depending on the nature of the pollutants, industrial wastewatercan be divided into: ⑴ Wastewater containing organic matter, such as wastewater from papermaking, sugar, food processing, dyeing and weaving industries; ⑵ Wastewater containing inorganic materials, such as hydraulic ash washing wastewater; from thermal power plants, mining industry Residue water and coal washing water in coal mining and coking industry; ⑶ Wastewater containing toxic chemicals, such as chemical industry, electroplating, smelting and other industrial wastewater; , tanning and slaughterhouse wastewater; ⑸Wastewater containing radioactive substances, such as wastewater from atomic energy power plants, radioactive mines and nuclear fuel processing plants; ⑹Cooling water for production, such as wastewater from thermal power plants andsteel mills. Industrial water pollution is very harmful: industrial wastewater flows directly into canals, rivers and lakes to pollute surface waters, if the toxicity is high, it will lead to death or even extinction , aquatic animals and plants. groundwater, polluting groundwater, then polluting crops; If surrounding residents use contaminated surface water or groundwater as domestic water, it will endanger their health and even cause death. Industrial wastewater seeps into the ground, causing soil pollution. Affecting the growth of plants and microorganisms in the soil; Toxic and harmful substances contained in industrial wastewater will remain in the body through ingestion and absorption of animals and plants, and then reach the human body through the food chain, causing harm to the human body. .