Principles of Industrial Wastewater Treatment

(1) The most fundamental thing is to reform the production process, as far as possible to prevent the production of toxic and harmful waste water in the production process. Such as replacing toxic materials or products with non-toxic materials or products.

(2) In the production process of using toxic raw materials and producing toxic intermediate products and products, adopt reasonable technological processes and equipment, and implement strict operation and supervision to eliminate leakage and minimize loss.

(3) Wastewater containing highly toxic substances, such as some heavy metals, radioactive substances, high-concentration phenol, cyanide and other wastewater, should be separated from other wastewater to facilitate the treatment and recovery of useful substances.

(4) Some wastewater with large flow and light pollution, such as cooling wastewater, should not be discharged into the sewer, so as not to increase the load on the urban sewer and sewage treatment plant. This type of wastewater should be recycled in the factory after proper treatment.

(5) Organic wastewater whose composition and properties are similar to urban sewage, such as papermaking wastewater, sugar wastewater, and food processing wastewater, can be discharged into the urban sewage system. Large-scale sewage treatment plants should be built, including simple and feasible treatment facilities such as biological oxidation ponds, sewage reservoirs, and land treatment systems built according to local conditions. Compared with small sewage treatment plants, large sewage treatment plants can not only significantly reduce capital construction and operating costs, but also because of the stable water volume and quality, it is easy to maintain good operating conditions and treatment effects.

(6) Some biodegradable toxic wastewater, such as phenol and cyanide wastewater, can be discharged into urban sewers according to allowable discharge standards after being treated in the plant, and be further treated by the sewage treatment plant for bio-oxidation degradation.

(7) Wastewater containing toxic pollutants that are difficult to biodegrade should not be discharged into urban sewers and sent to sewage treatment plants, but should be treated separately.