With the rapid development of industry, the types and quantity of wastewater are increasing rapidly, and the pollution of water is becoming more and more extensive and serious, threatening human health and safety.
 
The collection and treatment of domestic sewage and wastewater is vital to public health and clean water. It is among the most important factors responsible for the general level of good health enjoyed. Sewers collect sewage and wastewater from homes, businesses, and industries and deliver it to wastewater treatment facilities before it is discharged to water bodies or land, or reused.