Liquid purification or separation – Processes – Chemical treatment
Patent
1997-08-13
1999-02-09
Woo, Jay H.
Liquid purification or separation
Processes
Chemical treatment
210764, 210766, C02F 106
Patent
active
058689427
ABSTRACT:
A process for treating a pathogen-containing sludge of biological solids including the steps of mixing the sludge with calcium oxide, ammonia and carbon dioxide so as to elevate a temperature of the mixed sludge to between 50.degree. C. and 140.degree. C. and to elevate a pH of the mixed sludge to greater than 9.8, pressurizing the mixed sludge to a pressure of greater than 14.7 p.s.i.a., and discharging the pressurized mixed sludge. The sludge has a water content of between 65% and 94% by weight. Ammonia is added to the sludge in the form of either ammonia gas, ammonium hydroxide, ammonium bicarbonate or as a byproduct of the reaction of the calcium oxide with the water in the sludge. Carbon dioxide is added to the sludge in the form of carbon dioxide gas or a reactant of ammonium bicarbonate. The pressurized mixed sludge is discharged by flashing the sludge across a restricting orifice and by evaporating a liquid component of the flashed sludge.
REFERENCES:
patent: 4076620 (1978-02-01), Opferkuch, Jr. et al.
patent: 4464257 (1984-08-01), Lynch et al.
patent: 4793927 (1988-12-01), Meehan et al.
patent: 4997572 (1991-03-01), Wurtz
patent: 5135664 (1992-08-01), Burnham
patent: 5196043 (1993-03-01), Wurtz
patent: 5217624 (1993-06-01), Yamane et al.
patent: 5281341 (1994-01-01), Reimers et al.
patent: 5417861 (1995-05-01), Burnham
patent: 5599461 (1997-02-01), Peltier, Jr. et al.
patent: 5635069 (1997-06-01), Boss et al.
Boss Edward E.
Shepherd Samuel L.
Morrison Betsey J.
Woo Jay H.
LandOfFree
Process for treating a waste sludge of biological solids does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for treating a waste sludge of biological solids, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for treating a waste sludge of biological solids will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1946199