Optimization of biogas production by co-digesting whey with diluted poultry manure

dc.contributor.author	Gelegenis, J	en
dc.contributor.author	Georgakakis, D	en
dc.contributor.author	Angelidaki, I	en
dc.contributor.author	Mavris, V	en
dc.date.accessioned	2014-06-06T06:47:54Z
dc.date.available	2014-06-06T06:47:54Z
dc.date.issued	2007	en
dc.identifier.issn	09601481	en
dc.identifier.uri	http://dx.doi.org/10.1016/j.renene.2006.11.015	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/3851
dc.subject	Biogas	en
dc.subject	Cheese whey	en
dc.subject	Co-digestion	en
dc.subject	Poultry manure	en
dc.subject.other	Chemical reactors	en
dc.subject.other	Manures	en
dc.subject.other	pH effects	en
dc.subject.other	Cheese whey	en
dc.subject.other	Co-digestion	en
dc.subject.other	Biogas	en
dc.subject.other	Biogas	en
dc.subject.other	Chemical reactors	en
dc.subject.other	Manures	en
dc.subject.other	pH effects	en
dc.subject.other	biodegradation	en
dc.subject.other	biogas	en
dc.subject.other	chemical oxygen demand	en
dc.subject.other	experimental study	en
dc.subject.other	gas production	en
dc.subject.other	manure	en
dc.subject.other	optimization	en
dc.subject.other	Biogas	en
dc.subject.other	Chemical Reactors	en
dc.subject.other	Manure	en
dc.subject.other	Ph	en
dc.title	Optimization of biogas production by co-digesting whey with diluted poultry manure	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.renene.2006.11.015	en
heal.publicationDate	2007	en
heal.abstract	A series of laboratory experiments were performed in continuously stirred tank reactors at mesophilic conditions, fed semi-continuously with various mixtures of diluted poultry manure and whey. Co-digestion of whey with manure was proved to be possible without any need of chemical addition up to 50% participation of whey (by volume) to the daily feed mixture. Up to this point, specific biogas production (L/kg VSin) remained roughly unchanged at the various whey fractions added in the feed mixture, mainly due to the lower chemical oxygen demand (COD) of whey compared to that of manure. At whey fractions above 50%, the reactor turned to be unstable, as shown by the considerable decrease in pH and biogas production. The experiments were scaled up to a continuously stirred pilot tank reactor, which had previously been acclimated to poultry manure digestion. Whey was gradually introduced in the feed, at increasing rates, replacing equivalent volumes of manure, in such a way, that total COD of the feed remained constant. For an hydraulic retention time of 18 days at 35 °C and organic loading rate of 4.9 g COD/LR d, it was found that biogas production increased from 1.5 to 2.2 L/LR d (almost 40%). This could be mainly attributed to the higher biodegradability of carbohydrates (main constituent of whey) compared to lipids (main constituent of manure) and to the correction (increase) of C:N ratio. © 2007 Elsevier Ltd. All rights reserved.	en
heal.journalName	Renewable Energy	en
dc.identifier.issue	13	en
dc.identifier.volume	32	en
dc.identifier.doi	10.1016/j.renene.2006.11.015	en
dc.identifier.spage	2147	en
dc.identifier.epage	2160	en