[ Influence du prétraitement mécanique et biologique des feuilles mortes de neem (azadirachta indica) sur la production du biogaz ]
Volume 16, Issue 2, July 2015, Pages 505–513
Joël Koda TIZE1, Darman Roger DJOULDE2, and Albert NGAKOU3
1 Département des Energies Renouvelables(ENREN), Université de Maroua BP.46, Maroua, Cameroon
2 Département d'Agriculture, Élevage et produits dérivés (AGEPD) Université de Maroua, Institut Supérieur du Sahel (ISS), BP 46, Maroua, Cameroon
3 Département de Sciences Biologiques, Université de Ngaoundéré BP. 454, Ngaoundéré, Cameroon
Original language: French
Copyright © 2015 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The potentials of dead neem leaves for the production of the biogas was investigated as key measure to reduce the deforestation mainly caused by firewood cuttings in the Far-North Cameroon. Biomass collected was allowed to undergo biological pretreatment to facilitate its hydrolysis during anaerobic co-digestion with the cow dung. Samplings of dead neem leaves were taken after 0, 5, 10, 15, 20 and 30 days of pretreatment. Collected substrates from the pretreatment unit were used to feed 1.5L micro-bioreactors in three doses namely 5%, 15% and 25%. The gross volume and flammable gas produced was evaluated. The pH of the various treatments was measured. Data on production were analyzed using SPSS 20.0 software at 5% level of significance. It appears from this study that the pretreated leaves supplied biogas just as from 4 days after digestion, while those which did not undergo this pretreatment started producing biogas after more than 3 weeks. In terms of the amount of the generated biogas, the15 days pretreated substrate produced 3158 ml which was 22%, 35% and 94% higher than those of non-pretreated leaves, mechanically pretreated leaves and cow dung respectively. With regard to the change in pH within the bioreactors, pH dropped to 4 during the co-digestion of non-biologically pretreated leaves. At the same time in bioreactors where the substrate was biologically pretreated, the pH was more stable and appropriate for the biogas production and varied around 6 and7.
Author Keywords: Biogas, biological pretreatment, mechanical treatment, anaerobic digestion, dead neem leaves.
Volume 16, Issue 2, July 2015, Pages 505–513
Joël Koda TIZE1, Darman Roger DJOULDE2, and Albert NGAKOU3
1 Département des Energies Renouvelables(ENREN), Université de Maroua BP.46, Maroua, Cameroon
2 Département d'Agriculture, Élevage et produits dérivés (AGEPD) Université de Maroua, Institut Supérieur du Sahel (ISS), BP 46, Maroua, Cameroon
3 Département de Sciences Biologiques, Université de Ngaoundéré BP. 454, Ngaoundéré, Cameroon
Original language: French
Copyright © 2015 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The potentials of dead neem leaves for the production of the biogas was investigated as key measure to reduce the deforestation mainly caused by firewood cuttings in the Far-North Cameroon. Biomass collected was allowed to undergo biological pretreatment to facilitate its hydrolysis during anaerobic co-digestion with the cow dung. Samplings of dead neem leaves were taken after 0, 5, 10, 15, 20 and 30 days of pretreatment. Collected substrates from the pretreatment unit were used to feed 1.5L micro-bioreactors in three doses namely 5%, 15% and 25%. The gross volume and flammable gas produced was evaluated. The pH of the various treatments was measured. Data on production were analyzed using SPSS 20.0 software at 5% level of significance. It appears from this study that the pretreated leaves supplied biogas just as from 4 days after digestion, while those which did not undergo this pretreatment started producing biogas after more than 3 weeks. In terms of the amount of the generated biogas, the15 days pretreated substrate produced 3158 ml which was 22%, 35% and 94% higher than those of non-pretreated leaves, mechanically pretreated leaves and cow dung respectively. With regard to the change in pH within the bioreactors, pH dropped to 4 during the co-digestion of non-biologically pretreated leaves. At the same time in bioreactors where the substrate was biologically pretreated, the pH was more stable and appropriate for the biogas production and varied around 6 and7.
Author Keywords: Biogas, biological pretreatment, mechanical treatment, anaerobic digestion, dead neem leaves.
Abstract: (french)
Cette étude cible la valorisation des feuilles mortes de neem pour la production du biogaz afin réduire la déforestation causée essentiellement par la coupe du bois de chauffage dans l'extrême nord du Cameroun. La biomasse des feuilles collectées a subi un prétraitement biologique pour faciliter son hydrolyse lors de la co-digestion anaérobie avec la bouse de vache. Les échantillons de feuilles mortes de neem ont été prélevés après 0, 5, 10, 15, 20 et 30 jours de prétraitement. Les substrats ainsi prélevés ont alimenté des micro-bioréacteurs de 1,5 litre suivant trois doses à savoir 5%, 15% et 25%. Le volume des productions brute et inflammable a été évalué. Le pH des différents traitements a été mesuré. Les données relatives à la production ont été analysées grâce au logiciel SPSS 20.0 au seuil de signification de 5%. Il ressort de cette étude que les feuilles prétraitées ont produit du biogaz dès le 4e jour de digestion, alors que celles n'ayant pas subi ce type de prétraitement passaient plus de 3 semaines avant d'en fournir. En terme de quantité du biogaz généré, on constate que le substrat prétraité pendant 15 jours a une production de 3158ml soit 22%, 35% et 94% supérieure à celles des feuilles non prétraitées, mécaniquement prétraitées et du témoin bouse de vache respectivement. En ce qui concerne de l'évolution du pH dans les bioréacteurs, on constate qu'il chute jusque 4 pendant la co-digestion des feuilles non prétraitées biologiquement. Dans les bioréacteurs où le substrat a subi un prétraitement biologique, le pH est plus stable et plus approprié pour la production du biogaz. Il fluctue autour de 6 et 7.
Author Keywords: Biogaz, digestion anaérobie, Prétraitement biologique, Prétraitement mécanique, Feuilles mortes de neem.
How to Cite this Article
Joël Koda TIZE, Darman Roger DJOULDE, and Albert NGAKOU, “Influence of mechanical and biological pretreatment of dead neem leaves (azadirachta indica) on biogas production,” International Journal of Innovation and Scientific Research, vol. 16, no. 2, pp. 505–513, July 2015.
