The dissolved oxygen distribution and nitrogen removal effect in different structures of wetlands were investigated by two groups of comparison experiments(vertical flow with horizontal flow;single-stage with three-stage horizontal flow).

This paper studies material preparation,ion exchange model,acid wash and Fe exchange quantity effect for defluoridation material saturation absorbent quantity of model 732 changed property resin defluoridation;also concomitant ion influence on defluoridation effect of Fe(Ⅲ)-R and defluoridation mechanism of defluoridation material is explored.

This paper discusses on the present situation of and existing problems in the process of the heavy- medium system of Xiqu Coal Mine's Coal Washery, emphatically analyzes on the de- medium effectiveness, which provides reliable foundation for reducing the cost (the medium consumption of the system) and increasing the de- medium effectiveness of the sculping screen.

The paper introduces the working principle,structural and technical characteristics,dehydration effect and economic benefits of GPJ-60A pressurized disk filter.

The impacts of various technological conditions on removal effects are investigated with the optimal technological conditions obtained as follows:ratio of Ca2+ to SO42- as 1.