Method of treating digested sludge

Details Method of treating digested sludge Method of treating digested sludge

2007-01-23

2007-01-23

Hruskoci, Peter A. (Department: 1724)

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

C210S721000, C210S722000, C210S724000, C210S727000, C210S906000, C210S916000

Reexamination Certificate

active

10829328

ABSTRACT:
A method of treating, in wastewater purification, sludge containing organic matter, divalent iron and phosphorus, in whichthe 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° 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, andthe aqueous solution obtained in dewatering is recirculated to the wastewater purification.

REFERENCES:
patent: 4221661 (1980-09-01), Shimizu et al.
patent: 4377486 (1983-03-01), Barrick et al.
patent: 5051191 (1991-09-01), Rasmussen et al.
patent: 5720882 (1998-02-01), Stendahl et al.
patent: 5888404 (1999-03-01), Jokinen
patent: 6217768 (2001-04-01), Hansen et al.
patent: 6368511 (2002-04-01), Weissenberg et al.
patent: 6855256 (2005-02-01), Blais et al.
patent: 0 832 853 (1998-04-01), None
patent: 57-004299 (1982-01-01), None
patent: WO 95/06004 (1995-03-01), None
patent: WO 96/20894 (1996-07-01), None
patent: WO 98/41479 (1998-09-01), None
patent: WO 03/045851 (2003-06-01), None
patent: WO 03/045852 (2003-06-01), None
E. Neyens et al.,Journal of Hazardous Materials,vol. B98, (2003), pp. 33-50.
E. Neyens et al.,Journal of Hazardous Materials,vol. B98, (2003), pp. 91-106.

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