Wastewater treatment methods use physical, chemical and biological methods to treat wastewater, purify wastewater, reduce pollution, and even achieve wastewater recovery, reuse, and full use of water resources.
Wastewater type
Domestic wastewater
Domestic sewage refers to the wastewater discharged by people in daily life activities. This kind of wastewater is mainly polluted by domestic waste and human excrement. The quantity, composition and concentration of pollutants are related to people’s living habits and water consumption. Domestic sewage generally does not contain toxic substances, but it has conditions suitable for microbial reproduction, contains a large number of bacteria and pathogens, and is harmful to a hygienic point of view.
Due to the increasing urban population, the problem of urban domestic wastewater treatment has become increasingly prominent. Because of backward technology, shortage of funds, and difficulty in governance, it has always affected the urban environment and its construction. If these problems are not solved as soon as possible, with the advancement of urbanization, the continuous increase in water consumption will make the pollution more serious and the impact will be even worse.
Urban domestic sewage is different from industrial wastewater, and can be stopped or industrial enterprises can be relocated to solve the problem. Urban domestic sewage mainly comes from a series of urban public places and public facilities such as families, schools and businesses. The breadth and inevitability of its sources also make it a regional trend in wastewater treatment. The pollutants of urban domestic sewage are various, but the main content is mostly organic matter, among which domestic waste such as starch, protein, sugar, mineral oil, etc., BOD2 (bio-oxygen demand), CODc2 (chemical oxygen demand), TkN (Kjeldahl nitrogen), TP (total phosphorus), TN (total nitrogen), etc. are also high, and it is easy to cause eutrophication of water bodies after being discharged into water bodies, so that algae grow and multiply, we The red tides and blooms that are usually seen are related to this. When the algae is written to death, the water will be corrupted and the water quality will deteriorate. This will make the performance characteristics of urban sewage and the content of specific components, so that when we deal with urban domestic sewage, we will The link has a clearer understanding.