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TitleAnaerobic digestion of coffee waste
Author(s)Neves, L.
Ribeiro, R.
Oliveira, Rosário
Alves, M. M.
KeywordsAlkaline hydrolysis pre-treatment
Hydrolysis rate constant
Instant coffee substitutes
Kitchen waste
Issue date2005
CitationINTERNATIONAL IWA SYMPOSIUM ON ANAEROBIC DIGESTION OF SOLID WASTE, 4, Copenhagen, 2005 - "Proceedings Fourth International IWA Symposium on Anaerobic Digestion of Solid Waste". Copenhagen : Technical University of Denmark, 2005. vol 1, p. 527-534.
Abstract(s)The anaerobic co-digestion of five different by-products from instant coffee substitutes production was studied in mesophilic conditions. The co-substrate was the excess of sewage sludge from the wastewater treatment plant located in the same coffee factory. Four of the tested wastes produced methane in the range of 0.24-0.28 m³CH4(STP)/kgVSinitial . Reduction of 50-73% in total solids and 75-80% in volatile solids were obtained and the hydrolysis rate constants were in the range of 0.035-0.063 dֿ¹. After 40 days, one waste, composed of 100% barley, achieved a methane yield as low as 0.02 m³CH4(STP)/kgVSinitial and 31% and 40% total and volatile solids reduction, respectively,. Two different strategies were applied to enhance the biodegradability of this waste. An alkaline hydrolysis pre-treatment, that increased the methane production up to 0,22 m³CH4(STP)/kgVSinitial and the total and volatile solids reductions up to 67 and 84%, respectively. A co-digestion with kitchen waste, that increased the methane production up to 0,36 m³CH4(STP)/kgVSinitial and the total and volatile solids reductions up to 61 and 67%, respectively.
TypeConference paper
AccessOpen access
Appears in Collections:CEB - Artigos em Livros de Atas / Papers in Proceedings

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