Liquid purification or separation – Processes – Treatment by living organism
Patent
1995-04-06
1998-07-28
Wyse, Thomas G.
Liquid purification or separation
Processes
Treatment by living organism
210631, 210750, 210761, C02F 1118
Patent
active
057858527
ABSTRACT:
A process and apparatus for pretreating microbial sludges in order to enhance secondary anaerobic digestion. The pretreatment process involves disrupting the cellular integrity of municipal sewage sludge through a combination of thermal, explosive decompression and shear forces. The sludge is pressurized and pumped to a pretreatment reactor where it is mixed with steam to heat and soften the sludge. The pressure of the sludge is suddenly reduced and explosive decompression forces are imparted which partially disrupt the cellular integrity of the sludge. Shear forces are then applied to the sludge to further disrupt the cellular integrity of the sludge. Disrupting cellular integrity releases both soluble and insoluble organic constituents and thereby renders municipal sewage sludge more amenable to secondary anaerobic digestion.
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N.J. Nagle, et al. "Efficacy of Hydrolytic Enzyme Augmentation and Thermochemical Pretreatments for Increased Secondary anaerobic Digestion of Treated Municipal Sewage Sludges," Applied Biochemistry and Biotechnology, vol. 34/35, 1992.
Nagle Nicholas J.
Rivard Christopher J.
Midwest Research Institute
O'Connor Edna M.
Wyse Thomas G.
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