Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1980-10-30
1983-05-10
Adee, John
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210792, 210271, 210290, 210506, B01D 2302
Patent
active
043828639
ABSTRACT:
A system for the rapid dewatering of sludge in large quantities makes use of a filter plate of design and construction capable of supporting heavy mechanized mobile equipment without damage to the filter media.
The filter plate features a monolithic plate of granular filter material used as the filtering medium in sludge beds for dewatering or reducing residual solids or sludge of potable water treatment systems. The filter material is made structurally rugged and with a smooth hard surface for the retention of sludge solids. The filter material is supported upon a substructure of aggregate providing approximately 40% internal voids for the gravity flow or drainage of filtrate and the back flow of chemicals and gases used in the rapid water reduction process. The assemblage is constructed of such strength as to allow for use of heavy handling equipment such as front end loaders in the removal of the dried sludge or cake upon the completion of the rapid water reduction process.
The process follows a cyclical pattern on adjacent sludge beds where raw sewage is pretreated with a polymer coagulant to break up solids and/or to flocculate the sludge particles and then spread on the filter bed as the filter bed is being filled. Large coagulated sludge particles gain weight as they settle, and water is drawn off by gravity while a bed is being filled to the desired designed level. Smaller sludge particles pass to the voids below by a vacuum of 10 to 15 inches when the vacuum is applied, to start the rapid dewatering process through the larger flocculated sludge particles. The mass may be periodically moved and heated while dewatering progresses. Upon completion of dewatering, one or more units of fron end loading equipment is used to move the dried sludge cake into heaps and load it into trucks for transport to disposal sites.
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Filtros Bulletin re fused alumina Underdrain Plates.
Adee John
International Sludge Reduction Company
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