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

Mambanzulua Ngoma P, Hiligsmann S, Sumbu Zola E, Culot M, Fievez T, Thonart P - Springerplus (2015)

Bottom Line: Whereas classical acidogenesis and acetogenesis were recorded.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.

View Article: PubMed Central - PubMed

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.

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.

No MeSH data available.


Maximum concentration of each metabolite produced by anaerobic digestion from different concentrations (1.7 to 54.4 g DW/l) of MU leaves (a) and MI leaves (b) in BMP tests.
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Fig4: Maximum concentration of each metabolite produced by anaerobic digestion from different concentrations (1.7 to 54.4 g DW/l) of MU leaves (a) and MI leaves (b) in BMP tests.

Mentions: The maximum amounts of the acetic acid were 1.5 g/l for Gl samples, from 0 to 5 g/l for MU leaves at concentrations of 1.7 g/l and 49.5 g/l, respectively and from 0.3 to 9.1 g/l for MI leaves at concentrations of 1.7 g/l and 54.4 g/l, respectively (Figure 4).Figure 4


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

Mambanzulua Ngoma P, Hiligsmann S, Sumbu Zola E, Culot M, Fievez T, Thonart P - Springerplus (2015)

Maximum concentration of each metabolite produced by anaerobic digestion from different concentrations (1.7 to 54.4 g DW/l) of MU leaves (a) and MI leaves (b) in BMP tests.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4374082&req=5

Fig4: Maximum concentration of each metabolite produced by anaerobic digestion from different concentrations (1.7 to 54.4 g DW/l) of MU leaves (a) and MI leaves (b) in BMP tests.
Mentions: The maximum amounts of the acetic acid were 1.5 g/l for Gl samples, from 0 to 5 g/l for MU leaves at concentrations of 1.7 g/l and 49.5 g/l, respectively and from 0.3 to 9.1 g/l for MI leaves at concentrations of 1.7 g/l and 54.4 g/l, respectively (Figure 4).Figure 4

Bottom Line: Whereas classical acidogenesis and acetogenesis were recorded.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.

View Article: PubMed Central - PubMed

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.

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.

No MeSH data available.