Online Monitoring System for Industrial Wastewater Treatment

Process characteristics: 1. The water quality and volume of industrial wastewater fluctuate greatly, with a wide range of changes. 2. The variation rule of industrial wastewater volume is different from that of domestic sewage, featuring random intermittence and uncertainty. 3. The pollutant concentration of industrial wastewater is relatively high, and the general CODcr value is above 2000 mg/L. 4. Industrial wastewater has complex and diverse components with high content, such as phenolic compounds (benzene series, heavy metal ions and other toxic substances, as well as pathogens, etc.). 5. The wastewater contains organic substances that are difficult to biodegrade and nutrient elements such as phosphorus; 6. The wastewater often contains radioactive substances; 7. The wastewater treatment is difficult; 8. It has a great impact on the environment: due to the high concentration of discharged pollutants or special properties (such as cyanide-containing wastewater), it will cause pollution hazards to the surrounding environment. 9. The wastewater needs to be disinfected before being discharged or reused. Application fields of industrial wastewater treatment equipment: 1. Printing and dyeing industry: The production wastewater discharged from printing and dyeing factories mainly contains dyes, acids, alkalis and various auxiliaries. If it is directly discharged without treatment, it will cause serious pollution to the water body and even damage the ecological environment. 2. Paper industry: The production wastewater discharged from paper mills mainly consists of bleaching and cooking waste liquid, pulp washing water, as well as part of cooking waste liquid and white water from mechanical processing, etc. This kind of wastewater has high and relatively stable content of fiber suspended solids. 3. Food and beverage processing industry: The production wastewater discharged from food processing plants mainly includes slaughterhouse sewage, floor washing water of meat processing plants and post-slaughter cleaning water. Among them, the floor washing water of meat processing plants accounts for about 60% of the total discharge. 4. Sugar and paper industry: The ferrous sulfate solution produced by the soda ash method discharged from sugar factories, commonly known as green vitriol, is a colloidal precipitate of solid iron hydroxide. 5. Chemical and pharmaceutical industry: The production process of various organic chemicals discharged from chemical plants cannot do without the participation of chemical raw materials and chemical products, which react to generate intermediate products or final products, and at the same time release a large amount of heat, making the temperature continuously rise until reaching the reaction equilibrium state. After cooling and cooling through the chemical reactor, solid crystalline salts are precipitated to obtain the finished products. Therefore, chemical and pharmaceutical enterprises generate a large amount of hot steam, and this heat needs to be dissipated by cooling devices. 6. Metallurgical and iron and steel smelting industry: In the process of metal smelting, various acids are used as catalysts to participate in redox reactions, generating metal oxides and various salts, and releasing a large amount of heat. Therefore, the waste gas from high-temperature furnaces in metallurgical and iron and steel smelting enterprises is also one of the important pollution sources. 7. Textile, printing and dyeing, leather and fur processing industry: The textile, clothing, leather and fur processing industry will generate a large amount of dust, fiber scraps, skin scraps, rags, plush cloth, dust, sand particles, etc. during the production process. If they are discharged without treatment, they will seriously pollute the air and affect human health. 8. Municipal engineering: Domestic sewage from residential areas is generally treated by a centralized collection system and then discharged into the urban pipe network after meeting the standards.

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