Sewage treatment: The process of purifying sewage in order to make sewage meet the water quality requirements of a certain water body for drainage or reuse. Sewage treatment is widely used in various fields such as construction, agriculture, transportation, energy, petrochemical, environmental protection, urban landscape, medical care, catering, etc., and is increasingly entering the daily life of ordinary people.
The topic of water pollution is constantly brought up, especially the problem of groundwater pollution. In Hangzhou, Wenzhou and other places in Zhejiang Province, farmers or entrepreneurs have invested in the environmental protection bureau to swim in the river, in order to attract everyone's attention to the severity of water pollution, although various environmental protection The director has chosen to remain silent or refuse, but the public's awareness of environmental protection is awakened, and the level of concern about water pollution has reached an unprecedented level. Surface water pollution is obvious, but groundwater pollution is shocking. 70% of China's 1.3 billion people drink groundwater, and more than 400 of the more than 660 cities use groundwater as a source of drinking water. However, according to reports, 90% of the city's groundwater has been polluted.
Another set of data also shows that groundwater is facing serious challenges. In 2011, Beijing, Shanghai and other 9 provinces and cities have evaluated 857 monitoring wells in their jurisdictions. The monitoring wells with water quality of Class I and II accounted for 2%, while the monitoring wells of Class IV and V accounted for 76.8%. .
