Oily wastewater is a kind of familiar industrialsewerage.
含油废水是一种常见的工业废水。
2
The pollutants mainly come from the urban industrial production and livings of residents. Therefore, the key to water pollution control is the urban sewerage control.
PPR pipe is a new type construction material widely used in civilian and industrial water supply and sewerage system, but it is poor in hot and pressure resistance.