Industrial Wastewater Treatment
Key features:
The industrial wastewater treatment plant replaces the secondary sedimentation tank in the traditional process, which can efficiently separate the solid and liquid and obtain stable reclaimed water for direct use. It can also maintain a high concentration of microbial mass in the biological pool, less residual sludge in the process, extremely effective in removing ammonia nitrogen, the suspended solids and turbidity of the effluent are close to zero, the bacteria and viruses in the effluent are greatly removed, the energy consumption is low, and the floor space is small. In the 70s, many GUO companies in the United States, Japan, South Africa and Europe began to use membrane bioreactors for sewage and wastewater treatment. There are more than 1,000 MBRs in operation in Japan. Its water source is domestic sewage (such as shower drainage, toilet drainage, laundry drainage, kitchen drainage, toilet drainage, etc.) and cooling water. The scope of application is suitable for residential areas, office buildings, shopping malls, hotels, restaurants, institutions, schools, troops, factories and other domestic sewage and similar industrial organic wastewater, such as textile, beer, papermaking, tanning, food, chemical industry organic sewage treatment.
Classification of the degree of processing
Modern sewage treatment technology, according to the degree of treatment, can be divided into primary, secondary and tertiary treatment.
primary treatment,
It mainly removes the solid pollutants in the suspended state in the sewage, and most of the physical treatment methods can only complete the requirements of primary treatment. After primary treatment, BOD can generally remove about 30%, which cannot meet the discharge standard. Primary treatment is a pretreatment of secondary treatment.
secondary treatment,
It mainly removes organic pollutants (BOD, COD substances) in colloidal and dissolved states in sewage, with a removal rate of more than 90%, so that organic pollutants can meet the discharge standards.
tertiary treatment,
Further treatment of refractory organic matter, nitrogen and phosphorus, and other soluble inorganic substances that can lead to eutrophication of water bodies. The main methods include biological denitrification and phosphorus removal method, coagulation and precipitation method, sand rate method, activated carbon adsorption method, ion exchange method and electroosmosis analysis method.
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