Accession Number : ADP006458

Title :   Treatment of Dredged Sludge By Mechanical Dehydration,

Corporate Author : JAPAN DREDGING AND RECLAMATION ENGINEERING ASSOCIATION TOKYO

Personal Author(s) : Maekawa, T.

Report Date : MAR 1992

Pagination or Media Count : 31

Abstract : Sludge deposits in the water area damage the ecosystems and environments; their elimination has always been an urgent task for human communities. Generally, sludge deposits are dredged out of the bottom of the water area, transported to, and discharged at a large disposal area on land. Recently, however, it has become increasingly difficult to secure disposal areas and routes of speedy transportation for disposal of dredged sludge. Accordingly, there is an urgent need to reduce both the volume of dredged sludge and the size of the disposal area. This mechanical method is different from the conventional engineering dehydration by loading, consolidation, and drainage in that the dredged sludge is separated into sludge cakes and clean water that can be returned to the water area through mechanical centrifugal dehydration. Sludge deposits are distributed thin and wide on the bottom of the water area, and a pump dredge has been proved effective in many cases for dredging the upper layers of sludge deposits accurately and without creating turbidity in water. This mechanical sludge treatment technique can be most efficient when used in combination with a pump dredge. This method offers the following advantages: (a) It requires smaller space for treatment and disposal of dredged sludge than the conventional method. (b) Facilities and costs for transportation can be reduced. (c) Various systems can be adopted for transportation of sludge cakes. (d) This system is transportable and compact and can be constructed anywhere either on land or on water.

Descriptors :   *DISPOSAL, *SLUDGE, *DREDGED MATERIALS, *WASTE TREATMENT, COSTS, DAMAGE, DEHYDRATION, DEPOSITS, DRAINAGE, DREDGING, ECOSYSTEMS, ELIMINATION, ENGINEERING, ENVIRONMENTS, FACILITIES, LAYERS, PUMPS, TRANSPORTATION, TURBIDITY, VOLUME, WATER.

Subject Categories : Civil Engineering
      Water Pollution and Control
      Solid Wastes Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE