Document Detail

Two-phased hyperthermophilic anaerobic co-digestion of waste activated sludge with kitchen garbage.
MedLine Citation:
PMID:  19804865     Owner:  NLM     Status:  MEDLINE    
For co-digestion of waste activated sludge with kitchen garbage, hyperthermophilic digester systems that consisted of an acidogenic reactor operated at hyperthermophilic (70 degrees C) and a methanogenic reactor operated at mesophilic (35 degrees C), thermophilic (55 degrees C) or hyperthermophilic (65 degrees C) conditions in series were studied by comparing with a thermophilic digester system that consisted of thermophilic (55 degrees C) acidogenic and methanogenic reactors. Laboratory scale reactors were operated continuously fed with a substrate blend composed of concentrated waste activated sludge and artificial kitchen garbage. At the acidogenic reactor, solubilization efficiencies of chemical oxygen demand (COD), carbohydrate and protein at 70 degrees C were about 39%, 42% and 54%, respectively, and they were higher than those at 55 degrees C by around 10%. The system of acidogenesis at 70 degrees C and methanogenesis at 55 degrees C was stable and well-functioned in terms of treatment performances and low ammonium nitrogen concentrations. Microbial community analysis was conducted using a molecular biological method. The key microbe determined at the hyperthermophilic acidogenesis step was Coprothermobacter sp., which was possibly concerned with the degradation of protein in waste activated sludge. The present study proved that the hyperthermophilic system was advantageous for treating substrate blends containing high concentrations of waste activated sludge.
Myungyeol Lee; Taira Hidaka; Hiroshi Tsuno
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of bioscience and bioengineering     Volume:  108     ISSN:  1347-4421     ISO Abbreviation:  J. Biosci. Bioeng.     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2009-10-06     Completed Date:  2010-01-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100888800     Medline TA:  J Biosci Bioeng     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  408-13     Citation Subset:  IM    
Department of Urban and Environmental Engineering, Kyoto University, Kyoto-Daigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan.
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MeSH Terms
Bacteria, Anaerobic / metabolism*
Biodegradation, Environmental
Bioreactors / microbiology*
Food Microbiology*
Hot Temperature
Refuse Disposal / methods*
Sewage / microbiology*
Reg. No./Substance:

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