| Thermophilic adaptation of a mesophilic anaerobic sludge for food waste treatment. | |
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MedLine Citation:
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PMID: 17900789 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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As opposed to mesophilic, thermophilic anaerobic digestion of food waste can increase the biogas output of reactors. To facilitate the transition of anaerobic digesters, this paper investigated the impact of adapting mesophilic sludge to thermophilic conditions. A 5L bench scale reactor was seeded with mesophilic granular sludge obtained from an up-flow anaerobic sludge blanket digester. After 13 days of operation at 35 degrees C, the reactor temperature was instantaneously increased to 55 degrees C and operated at this temperature until day 21. The biomass was then fed food waste on days 21, 42 and 63, each time with an F/M (Food/Microorganism) ratio increasing from 0.12 to 4.43 gVS/gVSS. Sludge samples were collected on days 0, 21, 42 and 63 to conduct substrate activity tests, and reactor biogas production was monitored during the full experimental period. The sludge collected on day 21 demonstrated that the abrupt temperature change had no pasteurization effect, but rather lead to a biomass with a fermentative activity of 3.58 g Glucose/gVSS/d and a methanogenic activity of 0.47 and 0.26 g Substrate/gVSS/d, related respectively, to acetoclastic and hydrogenophilic microorganisms. At 55 degrees C, an ultimate gas production (Go) and a biodegradation potential (Bo) of 0.2-1.4 L(STP)/gVS(fed) and of 0.1-0.84 L(STP) CH(4)/gVS(fed) were obtained, respectively. For the treatment of food waste, a fully adapted inoculum was developed by eliminating the initial time-consuming acclimatization stage from mesophilic to thermophilic conditions. The feeding stage was initiated within 20 days, but to increase the population of thermophilic methanogenic microorganisms, a substrate supply program must be carefully observed. |
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Authors:
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Luis Ortega; Suzelle Barrington; Serge R Guiot |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2007-09-27 |
Journal Detail:
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Title: Journal of environmental management Volume: 88 ISSN: 0301-4797 ISO Abbreviation: J. Environ. Manage. Publication Date: 2008 Aug |
Date Detail:
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Created Date: 2008-05-26 Completed Date: 2008-10-22 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0401664 Medline TA: J Environ Manage Country: England |
Other Details:
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Languages: eng Pagination: 517-25 Citation Subset: IM |
Affiliation:
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Department of Bioresource Engineering, McGill University, 21 111 Lakeshore Road, Ste-Anne-de-Bellevue, QB, Canada. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Anaerobiosis Animals Bacteria, Anaerobic / metabolism* Biomass Bioreactors / microbiology* Fermentation Garbage Hot Temperature* Malus / metabolism Milk / metabolism Refuse Disposal / methods* Waste Products |
| Chemical | |
Reg. No./Substance:
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0/Waste Products |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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