Method of treating digested sludge
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United States of America Patent
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Jan 23, 2007
Grant Date -
Jan 6, 2005
app pub date -
Apr 22, 2004
filing date -
Apr 23, 2003
priority date (Note) -
Expired
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Abstract
A method of treating, in wastewater purification, sludge containing organic matter, divalent iron and phosphorus, in which the sludge that is treated is made to contain dissolved iron and phosphorus at a molar ratio Fe:P of above 1:1, the sludge is treated at 0 100.degree. C. with an acid at a pH of 1 5 for dissolution of divalent iron and phosphorus from the sludge, the sludge is supplied with an oxidizer selected from hydrogen peroxide and percompounds, wherein divalent iron is oxidized by Fenton's reaction to trivalent iron, and (i) trivalent iron is precipitated as trivalent iron phosphate (ii) free radicals with a deodorization and sanitation effect are formed by Fenton's reaction, the sludge is then dewatered at a pH of at most 7, and the aqueous solution obtained in dewatering is recirculated to the wastewater purification.
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