Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1982-02-23
1984-05-15
Hruskoci, Peter A.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210712, 210725, 423132, 423150, C02F 152, C02F 1114
Patent
active
044486960
ABSTRACT:
An improved process for recovering and recycling coagulant present in water treatment sludges. The improvement comprises several steps. First, enough acid is added to the sludge to solubilize most, but not all, of the coagulant in the sludge. Next, the acid-treated sludge is filtered on a non-mechanical horizontal filter to produce the recovered coagulant in solution as the filtrate. The recovered coagulant has a greater coagulative effect, when later recycled to treat raw water, than the mole equivalent of commercial coagulant. A portion of the recovered coagulant is discarded to control the increase in concentration of unwanted impurities in the recovered coagulant. Finally, this process permits neutralization and later removal of the filtered sludge on the surface of the non-mechanical horizontal filter.
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Hruskoci Peter A.
U.S. Environmental Products, Inc.
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