The principle behind the Fournier Rotary PressTM is straightforward. Sludge is fed into a channel at low pressure that rotates between two parallel slow revolving (0.2 to 2 rpm) stainless steel filtering elements (screens).
As free water passes through screens, the sludge continues to dewater as it travels around the channel. The flocculated sludge builds up solids until enough pressure is generated against the outlet restrictor arm. The frictional force of the slow-moving filtering elements, coupled with controlled outlet restriction, generates enough back pressure to dewater the remaining solids, resulting in the extrusion of a very dry cake.
A single-width channel can dewater all varieties of sludge produced in industries like paper and pulp mills, factories, municipalities, breweries, bio-gasification, farming (animal manure), agro-food, and mining, without any physical modification.
