Why can mineralization and reduction technology be protected so well?

The main reason for the formation is that the water body flows too slowly or does not flow, resulting in insufficient dissolved oxygen in the water, and aerobic bacteria cannot survive. In addition, the discharge of domestic sewage and the rise of COD (chemical oxygen demand) make a large number of anaerobic bacteria breed, and the metabolism of anaerobic bacteria will produce a large number of biogas, which is the main reason for the formation of black odor. Detection indicators: one is COD, and the other is dissolved oxygen.

Difficulties in the treatment of black and odorous rivers: pollution source control: nitrogen and phosphorus nutrients in water bodies seriously exceed the standard. The water system completely destroys the self-purification ability of water body, and the characteristics of black and smelly rivers are poor. The bottom of the river hardens, and so on. The key point of the treatment of black and odorous rivers is to build a water system and restore the self-purification ability of water bodies. It is important to control the entry of pollution sources, especially the direct discharge of sewage.