In cities, it is also called wastewater purification plant or sewage treatment plant. When the effluent is put into the urban drainage pipe, the treatment station is actually a kind of pretreatment facility. A wastewater treatment plant is a complex system composed of multiple unit processes. The cost and efficiency of each unit process are interrelated and influence each other, and ultimately determine the cost and efficiency of the entire system.
In cities, it is also called wastewater purification plant or sewage treatment plant. When the effluent is put into the urban drainage pipe, the treatment station is actually a kind of pretreatment facility. The general goal of wastewater treatment is to remove suspended solids and improve oxygen consumption (that is, to stabilize organic matter), and sometimes disinfection and further treatment. The treatment of industrial wastewater focuses on the removal or conversion of oils, suspended solids, heavy metals, and high-residue organic substances that hinder the operation of municipal sewage plants, and the adjustment of pH.