Abstract
The efficiency and the cost of dewatering lime and alum generated physical-chemical treatment sludge were developed utilizing a continuous vacuum filter and a solid bowl conveyor centrifuge. Centrifugal dewatering included evaluation of both single-stage and two-stage classification dewatering. The evaluation of the data showed that lime recovery was economical with both a single and two-state centrifugal as well as vacuum filter above the plant size of 25,000,000 gal/day. Tables show the comparative cost of dewatering the lime and alum sludges for various sizes of treatment plants and with costs itemized for capital and operating considerations. Vacuum filters are the least-cost approach based on the results of the field studies. The paper also shows the process effects of varying operating parameters for these centrifuge and vacuum filter operations.
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