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Thermal Hydrolysis of Secondary Scum for Control of Biological Foam
Author(s) -
Jolis Domènec,
Marneri Matina
Publication year - 2006
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143006x101746
Subject(s) - activated sludge , hydrolysis , waste management , wastewater , foaming agent , thermal hydrolysis , process (computing) , sewage treatment , pulp and paper industry , chemistry , environmental science , materials science , engineering , computer science , sewage sludge treatment , composite material , biochemistry , porosity , operating system
Thermal hydrolysis of secondary scum at 9 bars and 170°C was shown to completely destroy Gordonia sp . cells and reduce its foaming potential, so that it can be recycled to headworks or sent to the solids‐handling side of the plant without the risk of causing foaming problems in the activated sludge system and anaerobic digesters. This process shows promise for biological foam control in wastewater treatment plants where solids retention time control and selective wasting cannot be applied and/or selector installation is not possible. An initial cost comparison of thermal hydrolysis and several widely accepted foam‐management strategies shows it to be competitive; however, optimization of operating pressure and temperature is necessary.