Sewage sludge dewatering process
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United States of America Patent
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Mar 6, 1990
Grant Date -
N/A
app pub date -
Nov 9, 1988
filing date -
Nov 9, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Solid organic substrates, such as sewage sludge, peat, and biomass, are dewatered in a three-stage process comprising mechanical dewatering of the substrate, followed by combination of the dewatered substrate with an organic solvent, followed by removal of the water-solvent mixture. The dried product is a granular, free-flowing substance suitable for incineration in relatively low-cost equipment. Conveniently, solvent will be recovered from the water-solvent mixture by conventional means, such as distillation, and recycled to the solvent mixing stage.
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