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Springerplus. 2015 Feb 11;4:75. doi: 10.1186/s40064-015-0832-y. eCollection 2015.

Comparative study of the methane production based on the chemical compositions of Mangifera Indica and Manihot Utilissima leaves.

SpringerPlus

Philippe Mambanzulua Ngoma, Serge Hiligsmann, Eric Sumbu Zola, Marc Culot, Thierry Fievez, Philippe Thonart, Bolman

Affiliations

  1. 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.
  2. Walloon Center of Industrial Biology (CWBI), Gembloux Agro-Bio Tech, University of Liège, 2 Passage des Déportés, 5030 Gembloux, Belgium.
  3. Faculty of Agricultural Sciences, University of Kinshasa, P. O. Box 117, Kinshasa XI, Democratic Republic of Congo.
  4. Laboratory of Microbial Ecology and Water Purification, Gembloux Agro-Bio Tech, University of Liège, B52, 27 Maréchal Juin, B-5030 Gembloux, Belgium.

PMID: 25825684 PMCID: PMC4374082 DOI: 10.1186/s40064-015-0832-y

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.

Keywords: Anaerobic digestion; Biogas; Leaves; Mangifera Indica; Manihot Utilissima; Methane

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