title: Comparative study of the methane production based on the chemical compositions of Mangifera Indica and Manihot Utilissima leaves.
abstract: Leaves of Mangifera Indica (MI, mango leaves) and Manihot Utilissima (MU, cassava leaves) are available in tropical regions and are the most accessible vegetal wastes of Kinshasa, capital of Democratic Republic of Congo. These wastes are not suitably managed and are not rationally valorized. They are abandoned in full air, on the soil and in the rivers. They thus pollute environment. By contrast, they can be recuperated and treated in order to produce methane (energy source), organic fertilizer and clean up the environment simultaneously. The main objective of this study was to investigate methane production from MI and MU leaves by BMP tests at 30°C. The yields achieved from the anaerobic digestion of up to 61.3 g raw matter in 1 l medium were 0.001 l/g and 0.100 l CH4/g volatile solids of MI and MU leaves, respectively. The yield of MU leaves was in the range mentioned in the literature for other leaves because of a poor presence of bioactive substrates, and low C/N ratio. This methane yield corresponded to 7% of calorific power of wood. By contrast, the methane yield from MI leaves was almost nil suggesting some metabolism inhibition because of their rich composition in carbon and bioactive substrates. Whereas classical acidogenesis and acetogenesis were recorded. Therefore, methane production from the sole MI leaves seems unfavorable by comparison to MU leaves at the ambient temperature in tropical regions. Their solid and liquid residues obtained after anaerobic digestion would be efficient fertilizers. However, the methane productivity of both leaves could be improved by anaerobic co-digestion.
authors.affiliation: Walloon Center of Industrial Biology (CWBI), Gembloux Agro-Bio Tech, University of Liège, 2 Passage des Déportés, 5030 Gembloux, Belgium ; Faculty of Pharmaceutical Sciences, University of Kinshasa, P. O. Box 212, Kinshasa XI, Democratic Republic of Congo.
authors.forename: Philippe
authors.initials: P
authors.lastname: Mambanzulua Ngoma
authors.affiliation: Walloon Center of Industrial Biology (CWBI), Gembloux Agro-Bio Tech, University of Liège, 2 Passage des Déportés, 5030 Gembloux, Belgium.
authors.forename: Serge
authors.initials: S
authors.lastname: Hiligsmann
authors.affiliation: Faculty of Agricultural Sciences, University of Kinshasa, P. O. Box 117, Kinshasa XI, Democratic Republic of Congo.
authors.forename: Eric
authors.initials: E
authors.lastname: Sumbu Zola
authors.affiliation: Laboratory of Microbial Ecology and Water Purification, Gembloux Agro-Bio Tech, University of Liège, B52, 27 Maréchal Juin, B-5030 Gembloux, Belgium.
authors.forename: Marc
authors.initials: M
authors.lastname: Culot
authors.affiliation: Laboratory of Microbial Ecology and Water Purification, Gembloux Agro-Bio Tech, University of Liège, B52, 27 Maréchal Juin, B-5030 Gembloux, Belgium.
authors.forename: Thierry
authors.initials: T
authors.lastname: Fievez
authors.affiliation: Walloon Center of Industrial Biology (CWBI), Gembloux Agro-Bio Tech, University of Liège, 2 Passage des Déportés, 5030 Gembloux, Belgium.
authors.forename: Philippe
authors.initials: P
authors.lastname: Thonart
keywords: Anaerobic digestion; Biogas; Leaves; Mangifera Indica; Manihot Utilissima; Methane
references.citation: Bioresour Technol. 2008 Jul;99(10):4044-64
references.pmid: 17399981
references.citation: Biotechnol Bioeng. 1993 Jun 20;42(2):159-66
references.pmid: 18612976
references.citation: Bioresour Technol. 2012 Jan;104:90-9
references.pmid: 22100239
references.citation: Phytochemistry. 2010 Aug;71(11-12):1198-222
references.pmid: 20570294
references.citation: Biotechnol Bioeng. 2011 Aug;108(8):1816-27
references.pmid: 21381001
references.citation: Biodegradation. 2005 Oct;16(5):415-22
references.pmid: 15865155
references.citation: Bioresour Technol. 2011 Feb;102(4):3810-8
references.pmid: 21185171
references.citation: J Ind Microbiol. 1994 May;13(3):147-53
references.pmid: 7764843
references.citation: World J Microbiol Biotechnol. 2013 Dec;29(12):2259-70
references.pmid: 23749247