Semi-continuous anaerobic co-digestion of thickened waste activated sludge and fat, oil and grease
- Department of Food, Agricultural, and Biological Engineering, Ohio State University/Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691-4096 (United States)
Highlights: > Co-digestion of thickened waste activated sludge (TWAS) with fat, oil and grease (FOG). > Co-digestion of TWAS and FOG at 64% VS increased biogas production by 137%. > FOG addition ratio at 74% of total VS caused inhibition of the anaerobic digestion process. > Micronutrients addition did not significantly improve the biogas production and digestion stabilization. - Abstract: Co-digestion of thickened waste activated sludge (TWAS) and fat, oil and grease (FOG) was conducted semi-continuously under mesophilic conditions. The results showed that daily methane yield at the steady state was 598 L/kg VS{sub added} when TWAS and FOG (64% of total VS) were co-digested, which was 137% higher than that obtained from digestion of TWAS alone. The biogas composition was stabilized at a CH{sub 4} and CO{sub 2} content of 66.8% and 29.5%, respectively. Micronutrients added to co-digestion did not improve the biogas production and digestion stabilization. With a higher addition of FOG (74% of total VS), the digester initially failed but was slowly self-recovered; however, the methane yield was only about 50% of a healthy reactor with the same organic loading rate.
- OSTI ID:
- 21578462
- Journal Information:
- Waste Management, Vol. 31, Issue 8; Other Information: DOI: 10.1016/j.wasman.2011.03.025; PII: S0956-053X(11)00177-2; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0956-053X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANAEROBIC DIGESTION
CARBON DIOXIDE
FATS
GREASES
INHIBITION
LOADING RATE
MESOPHILIC CONDITIONS
METHANE
OILS
SLUDGES
STABILIZATION
STEADY-STATE CONDITIONS
WASTES
ALKANES
BIOCONVERSION
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DIGESTION
HYDROCARBONS
LUBRICANTS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS