The compilation of the zoning plan for sewage control in Conghua City is based on the geographical condition and existing status of drainage, taking account of multiple factors such as the technology, economy and feasibility.

It is pointed that if built-operation-transfer method is applied to the built, operation and management of built-operation-transfer method plants, which will speed the wastewater treatment pace, promote the development of environmental industry, and improve the environmental quality in china.

This paper described the characteristics,current draining state and existing difficult problems of oilfield wastewater treatment,and defined a new concept of return injection for the environment protection.

Using Eastman waste water treatment case,this paper presents the detailed scheme to combine simulations with ex- periments for process design.

With the analysis of the water quality of the coal conveying system in the coal-fired power plant and in combined with the waste water treatment in Xibaipo Coal-fired Power Plant, a chemical flocculation was used to treat the waste water.

Monitoring and assessing the processes for waste water treatment employed in different factories, we screen out reasonable ones, achieving the Drainage Standard with lowered operational expense.