Based on a brief introduction to a sludge water discharger designed for a sedimentation tank,including its process control and working priniple,this paper presents a set of PLC control system suitable for the sludge water discharger in a waterworks and the real-time communication between computer and PLC.

The sludge removal machine with high efficiency and low consumption of materials can not only save equipment costs, enhance economic efficiency, reduce operation costs, but also ensure an optimum level of process.

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.