The research on the process conditions of removing manganese and ferrum pollution from industrial cooling water by the contact oxidation using the natural manganese sand filtering material is conducted.

This paper presents the recycling process of wastewater scouring feather with method of coagulation deposition and sand filtration in Chengmai Feather Factory.

The principles,processes,costs and(effects) of different disinfection techniques were summarized,especially a new method of slow sand filtration was introduced.

Experimental study on characteristics of laminated sand filter for micro-irrigation;

Computational simulation of hydraulic characteristics for laminated sand filter;