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Kinetic Studies and Anaerobic Co‐digestion of Vegetable Market Waste and Sewage Sludge
Author(s) -
Anhuradha S.,
Vijayagopal V.,
Radha P.,
Ramanujam R.
Publication year - 2007
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.200600014
Subject(s) - sewage sludge , biogas , anaerobic digestion , waste management , biodegradable waste , pulp and paper industry , thermal hydrolysis , environmental science , chemistry , sewage sludge treatment , organic matter , sewage , sewage treatment , methane , engineering , organic chemistry
The effect of anaerobic co‐digestion of vegetable market waste and sewage sludge was studied extensively. The effects of co‐digestion were compared with the separate digestion of vegetable market waste and sewage sludge. The batch studies were carried out using three bench scale reactors having 1.5 L working volume. The cumulative biogas production shows that the organic waste available from the vegetable waste contains easily biodegradable organic matter compared with the sewage sludge. First order reaction kinetics is maintained throughout the methanation fermentation. The reductions in volatile solids (VS) in the three reactors were in the range of 63–65 %. The specific gas production for vegetable waste was higher (0.75 L biogas/g VS in and 1.17 L biogas/g VS des ) than for the sewage sludge (0.43 L biogas/g VS in and 0.68 L biogas/g VS des ). Consequently, the specific gas production for the co‐digestion of the mixture of vegetable waste and sewage sludge (0.68 L biogas/g VS in and 1.04 L biogas/g VS des ) was considerably higher than for the sewage sludge only. Batch kinetics of anaerobic digestion is useful in predicting the performance of digesters and for the design of appropriate digesters.