The anaerobic biodegradability of municipal sludge and fat, oil, and grease at mesophilic conditions

Water Environment Research : a Research Publication of the Water Environment Federation
John C KabourisRobert A Gillette

Abstract

The anaerobic biodegradability of municipal primary and secondary sludge with increasing levels of partially dewatered fat, oil, and grease (FOG) was assessed using a mixed methanogenic culture at 35 "C. Under batch conditions with an acclimated and enriched microbial population, the sludge loading was 3 kg volatile solids/m3 and the highest FOG loading tested was 1.5 kg volatile solids/m3, resulting in a methane yield of 245 mL methane/g sludge volatile solids added at 35 degrees C and 1010 mL methane/g FOG volatile solids added at 35 degrees C. Under semicontinuous feeding conditions, the sludge and sludge plus FOG loading tested were 3 and 3.75 kg volatile solids/m3-d, respectively. Within 23 days of operation, the volatile fatty acid concentrations were reduced below 200 mg chemical oxygen demand/L (187 mg/L as acetic acid). Enhancement of sludge digestion was observed in those reactors where codigestion of sludge and FOG took place, which was attributed to a higher level of microbial activity maintained in these reactors as a result of FOG degradation. The results of this study demonstrate that beneficial use of FOG through codigestion with municipal sludge is feasible.

References

Jan 5, 2002·Water Environment Research : a Research Publication of the Water Environment Federation·A PereiraM Alves
Aug 22, 2002·Water Research·Jerald Lalman, David M Bagley
Mar 18, 2004·Water Research·Young H Lee, Spyros G Pavlostathis

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Citations

Aug 28, 2009·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Recep Kaan DereliOzgur Ozdemir
Apr 5, 2013·Bioprocess and Biosystems Engineering·Bradley YoungKevin Kennedy
Jul 1, 2017·Water Environment Research : a Research Publication of the Water Environment Federation·Ross VarinCharles Bott
May 29, 2009·Water Environment Research : a Research Publication of the Water Environment Federation·John C KabourisRobert A Gillette
Feb 11, 2020·Applied Microbiology and Biotechnology·Rosa MarchettiFrancesca Fiume
Nov 2, 2019·Environmental Science and Pollution Research International·Yong HuKai-Qin Xu

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