Sludge dewatering filter press

Filter presses are widely used in household sewer wastewater treatment processes in populated settlements of all types, in pulp and paper industry, in food, coal, oil industries, in agricultural enterprises for forage production, waste processing, breeding of cattle, pigs, poultry, in food industry (in making alcoholic beverages and soft drinks).

Operating principle

Directly from the treatment plant the sludge along with flocculant enters the upper belt of the press and is evenly distributed on it, mixed by ploughs, which makes dewatering more efficient. The dewatering (by up to 50 percent) occurs under the effect of natural force of gravity of 1 g.

After that the sludge enters the wedge zone — the place where upper and lower belts converge. Here the process of mechanical separation of water mass from all solid particles begins.

The process of pressing with gradual increase of pressure on the sludge does not allow the liquid to be sprayed, and solid inclusions to be displaced at edges of the belt. To stabilize water removal process both belt and shaft in the wedge zone are punched in a special way.

A series of shafts with decreasing diameter ensure maximum pressure on the belt press. Shaft are made in such a way that the superficial pressure is directed along the radius, in a tangent trajectory to the surface of cylinder.

Then special blades clean off from the belt the solid substance (residue), which is carried to a dedicated reservoir for disposal. And the belt is necessarily washed from waste before next operating cycle is started.