The LW520 paper mill sludge dewatering decanter centrifuge is built for the demanding environment of pulp and paper wastewater treatment. Paper production generates primary sludge rich in fibers and fillers together with secondary biological sludge from activated sludge basins. Both streams are notoriously difficult to dewater because of their gelatinous structure, fine particle size and high bound water content. This horizontal decanter tackles the problem with a 520 mm