The purpose of Sludge Treatment & Dewatering (De-hydration) is to extract water from the solids and dispose the dewatered residue.
The dewatering equipment is designed to remove water in much shorter time than nature would by gravity. Cannon Artes’ Sludge Dewatering techniques are briefly summarised as follows:
Aerobic sludge digestion: The function of aerobic sludge digestion is to stabilise sludge solids by long-term aeration thus reducing the BOD and destrying volatile solids. The most common application of aerobic digestion is in handling activated sludge. Digested sludge from sanitary treatment is often spread on farmland or on drying beds.
Gravity thickening is well used to increase the solid content of the sludge in particular ahead of filter presses, belt filter presses, centrifuges and drying beds to achieve higher sludge concentration before dewatering. The tank of a gravity thickener resembles a circular clarifier with a steep slope through which a rotating sludge scraper moves the thickened sludge to a central outlet for continuous or intermittent discharge
Belt Presses are designed so that the sludge is sandwiched between two tensioned porous belts and passed over and under rollers of various diameters. The rollers exert increasing pressure on the sludge, thus squeezing out water. In Filter Presses, on the other hand, the sludge is distributed between an array of porus plates that are then forced to adhere under pressure squeezing water outside of sludge. In Centrifuges, the centrifugal force is used to increase the separation rate of solid sludge particles.