Abstract
The combination system of a centrifugal thickening and a centrifugal dewtering is planned to be adopted in a large scale sludge treatment plant which collects a large amount of sludge in a wide area. Because this system needs the smallest land requirement for installation and it produces a minimum amount of sidestream . Centrifuge has two functions which are liquid-solids separation and condensed solids conveyance. The ability of solids conveying increases according to.the scale-up of centrifugal dewatering. Therefore it is very rational to be set a centrifugal thickening before a centrifugal dewatering in a large scale plant. A small amount of polymer addition in a centrifugal thickening process improves centrate quality quite well. It is essential to keep sidestream quality well enough to be accepted by a neighbor waste- water treatment plant. This study presents an improved combination system which can get low water content in cake and high SS capture rate totally.
