A set of sewage treatment should cost a lot of money, and the Food City of Crescent Lake does not want to spend this money.

Sewage treatment process is a combination of processes used for certain sewage treatment.

Usually based on the quality and quantity of sewage, the economic value of recycling, discharge standards and other social and economic conditions, after analysis and comparison, if necessary, experimental research is also required to determine the treatment process to be used.

The general principles are: reform technology, reduce pollution, recycling, comprehensive prevention and control, advanced technology, economic rationality, etc.

When choosing a process, we should focus on the overall optimization, rather than just pursuing the optimization of a certain link.