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• W1990603596 endingPage "1359" @default.
• W1990603596 startingPage "1351" @default.
• W1990603596 abstract "Anaerobic conversion of dairy manure into biogas is an attractive way of managing this waste. It is well known that the hydrolysis of large molecules into small, directly biodegradable ones is the rate limiting step of the overall anaerobic process. The present work studies the development of the hydrolytic and acidogenic stages of dairy manure with different solid concentrations (40, 60 and 80 g VS/L) at ambient temperature (20 degrees C). The purpose was to determine the operational conditions that provide a liquid fraction with a high soluble chemical oxygen demand (COD) and a high volatile fatty acids (VFA) content in manure before the methanogenic stage starts up. At 20 degrees C, the evolution of the studied parameters showed that, in a controlled plug-flow dung pit, the hydrolytic and acidogenic stages progressed moderately in a continuous way during the 25 days that the experimentation lasted, whereas no methanization was observed. Supernatant COD and VFA concentrations increased 30% and 107%, respectively, for the 60 g VS/L samples. Manure was also operated at 35 degrees C with a similar increase in supernatant COD but a higher increase in VFA, 154%. For both operational temperatures, the predominant VFAs were, in this order, acetic, propionic and butyric acids. During the operation at 35 degrees C, the methanogenic stage started between days 20 and 25 for the samples with lower solids content, i.e. 40 and 60 g VS/L." @default.
• W1990603596 created "2016-06-24" @default.
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• W1990603596 date "2009-12-01" @default.
• W1990603596 modified "2023-10-05" @default.
• W1990603596 title "Evolution of composition of dairy manure supernatant in a controlled dung pit" @default.
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• W1990603596 doi "https://doi.org/10.1080/09593330903100001" @default.
• W1990603596 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20088199" @default.
• W1990603596 hasPublicationYear "2009" @default.
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