Municipal sewage treatment refers to the treatment of urban domestic sewage, the removal of harmful substances and pollutants in it, so that it meets the national discharge standards, and then can be used for irrigation, landscape water and other important purposes after proper treatment. Municipal wastewater treatment generally includes the following process steps:
1.Primary treatment: It is mainly through physical treatment methods to remove large particulate matter, suspended solids, sediments, etc. in sewage, and common methods include grids, grit tanks, sedimentation tanks, etc.
2.Biological treatment: through biodegradation, the organic substances in the sewage are converted into inorganic substances and organisms, common methods include activated sludge method, aerobic-anaerobic method, constructed wetland, etc.
3.Advanced treatment: The process of further removing excess suspended solids and nutrients such as nitrogen and phosphorus is carried out on the biologically treated sewage to achieve higher water quality standards, common methods include filters, adsorption, membrane separation, etc.
4.Secondary purification: disinfection and sterilization of the deeply treated water to kill bacteria, viruses and other microorganisms, common methods include ultraviolet disinfection, ozone disinfection, etc.
In general, municipal sewage treatment needs to be selected and designed according to the actual local conditions and requirements to achieve reasonable and efficient treatment results.