Liquid purification or separation – Processes – Treatment by living organism
Patent
1993-03-31
1994-11-01
Upton, Christopher
Liquid purification or separation
Processes
Treatment by living organism
210609, 210613, 210631, C02F 1104
Patent
active
053605462
ABSTRACT:
A method for treating an organic sludge is provided which can sufficiently and efficiently solubilize an organic sludge to afford a high load of anaerobic digestion treatment with an improved digestion ratio and methane gas recovery amount thereby to widely decrease the amount of the organic sludge discharged from the method. The method includes a hot alkaline treatment for causing the organic sludge to become alkaline while maintaining the temperature of the sludge to ambient -100.degree. C. to solubilize organic matters in the sludge, and an anaerobic digestion treatment of anaerobically digesting the organic sludge after the hot alkaline treatment at a temperature of 20.degree.-60.degree. C. at a pH of 7.3-9.2.
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R. V. Rajan et al., "Low-Level Chemical Pretreatment for Enhanced Sludge Solubilization", Nov./Dec. 1989, pp. 1678-1683.
Yu-You Li et al., "Upgrading of Anaerobic Digestion of Waste Activated Sludge by Thermal Pretreatment", May, 1992.
Inagaki Noriaki
Miyata Atsushi
Suzuki Shigehiro
Tomita Yoshiho
NGK Insulators Ltd.
Upton Christopher
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