Liquid purification or separation – Automatic control – Thermal
Patent
1997-06-16
1999-03-23
Wyse, Thomas G.
Liquid purification or separation
Automatic control
Thermal
210194, 210201, 210218, 210220, C02F 312
Patent
active
058854487
ABSTRACT:
A system for thermophilic aerobic destruction of pathogenic organisms and organic matter within waste water treatment sludge includes a tank for maintaining the sludge and an air transfer apparatus for injecting air into the sludge near the bottom thereof so as to bubble up through the sludge and react exothermically with the thermophilic microorganisms therein so as to kill or destroy the mesophilic microorganisms within the sludge. The thermophilic reaction is preferably controlled within a desired temperature range by control of the flow of fresh air versus recycled air being injected into the sludge. The fresh air to recycle air ratio can be controlled by several different mechanisms so as to produce the desired temperature range. The air is also utilized to mix the sludge within the tank. A pumping apparatus is also provided for transferring sludge into and out of the tank and for recirculating the sludge for purposes of auxiliary mixing. The pump can also be utilized in conjunction with an eductor for drawing fresh air into the sludge. A process controller is advantageously useable in conjunction with the various equipment to control the overall system.
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Kenneth L. Norcross, A Full Scale Comparative Evaluation of Aerator Thermal Transfer Characteristics, Oct. 1985; pp. 1-24.
Harlan G. Kelly, Henryk Melcer, Donald S. Mavinc, Authothermal thermophilic aerobic digestion of municipal sludges; A one-year, full-scale demonstration project, Nov./Dec., Water Environment Research, vol. 65, No. 7, p. 859.
Harlan G. Kelly, M.ASCE*, Authothermal Thermophilic Aerobic Digestion; A Two-Year Appraisal of Canadian Facilities, Environmental Engineering Proceedings, 1991, p. 296.
Li Yanlong
Norcross Kenneth L.
IP Holding Company
Wyse Thomas G.
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