As there are plenty of pollutants in the sediments of East Lake Taihu, measures were put forward to prevent the effluents of mud-dumping yard from polluting the river network according to the practice of environmental dredging,thus decreasing the secondary pollution on water environment.

Automatic monitoring and sludge discharge for suspension layer of swirling clarifier;

Experiment of full-scale operation in perforated pipe with divergent tube in sludge discharge;

Based on the principle of hydraulics, the divergent tube is high in discharge coefficient and velocity coefficient at the inlet and high in vacuum at the contraction section, so the efficiency of sludge discharge increases significantly.

In order to assure generation units steady operation must optimize the link of purifying water : adopt best ways of mud discharge by D100M radial flow precipitation tank , D29M mechanical agitation settling pond to save water.

Drainage and mud system on underground are important safety production facilities in metal mine.

Attempt on utilization of solid sludge resource in city——Using drain sludge to make clay pipe;