Effect of Fat, Oil, and Grease (FOG) and Inoculum Source on Co-digestion in Batch Anaerobic Digesters Public

http://ir.library.oregonstate.edu/concern/honors_college_theses/5138jg94k

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  • Anaerobic co-digestion of fats, oils, and grease (FOG) for increased methane (CH4) production has been of increasing interest to municipal wastewater treatment plants (WWTP) due to the potential economic benefit of using the produced biogas for cogeneration of energy. FOG loading increase must be done carefully to mitigate the risk for anaerobic digester upset or failure. Batch anaerobic digesters, containing inoculum collected from either Gresham or Corvallis WWTPs, were used to test the effects of 7 FOG sources (bakery, cherry brine, mayonnaise, mixed FOG, vitamin, “Westside”, and yogurt wastes) at various FOG loadings on batch anaerobic digester performance. There were three goals of this study: (1) compare the ability of different FOG sources to increase biogas production and to find the optimal loading rate for each FOG source, (2) compare the success of inoculum from a facility with a FOG addition program (Gresham) with one that had never received FOG additions (Corvallis), (3) find signals of anaerobic digester upset through high FOG loadings. FOG addition was able to increase batch anaerobic digester biogas and CH₄ productions by up to 425 % and 333 %, respectively. Higher FOG loadings as compared to lower FOG loadings were associated with lower pH and biogas and CH₄ yields, and increased risk of failure.
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