Journal
WATER RESEARCH
Volume 45, Issue 14, Pages 4248-4259Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2011.05.048
Keywords
Distillery spent wash; Biphasic reactor; Kinetic modelling; Bacterial community; 16S rRNA gene
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Anaerobic digestion, microbial community structure and kinetics were studied in a biphasic continuously fed, upflow anaerobic fixed film reactor treating high strength distillery waste-water. Treatment efficiency of the bioreactor was investigated at different hydraulic retention times (HRT) and organic loading rates (OLR 5-20 kg COD m(-3) d(-1)). Applying the modified Stover-Kincannon model to the reactor, the maximum removal rate constant (U-max) and saturation value constant (K-B) were found to be 2 kg m(-3) d(-1) and 1.69 kg m(-3) d(-1) respectively. Bacterial community structures of acidogenic and methanogenic reactors were assessed using culture-independent analyses. Sequencing of 16S rRNA genes exhibited a total of 123 distinct operational taxonomic units (OTUs) comprising 49 from acidogenic reactor and 74 (28 of eubacteria and 46 of archaea) from methanogenic reactor. The findings reveal the role of Lactobacillus sp. (Firmicutes) as dominant acid producing organisms in acidogenic reactor and Methanoculleus sp. (Euryarchaeotes) as foremost methanogens in methanogenic reactor. (C) 2011 Elsevier Ltd. All rights reserved.
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