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Comparative study of biogas production from anaerobic bio-digestion of peelings and effluents from cassava processing factories in southern Benin

University of Science, Technology, Engineering and Mathematics, Benin

Abstract

In Benin, the growth of cassava processing agro-industries generates significant quantities of waste: cassava peelings and effluents. Although these wastes bulky and harmful to health and the environment, they can be recycled into biogas. This study aimed to compare biogas production from anaerobic bio-digestion of peelings and effluents, two by-products of cassava processing into gari in southern Benin. The experimental device was a Ficher block comprising the following seven treatments all added to 400 g of water: 1^st treatment (T1) consisting of 400 g of crushed cassava peelings; T2 composed of 300 g of peelings and 100 g of cow dung; T3 composed of 200 g of peelings and 200 g of cow dung; T4 composed of 400 g of effluent; T5 composed of 300 g of effluent and 100 g of cow dung; T6 composed of 200 g of effluent and 200 g of cow dung; T0 (or control) composed of 400 g of cow dung. The results showed that the average volumes of biogas for the treatments T0, T1, T2, T3, T4, T5 and T6 were respectively around 40.74 ml on the 25^th day, 11.74 ml on the 33rd day, 13.48 ml on day 31, 22.61 ml on day 29, 24.35 ml on day 27, 23.04 ml on day 27 and 34.13 ml on day 21. The variance homogeneity test (p=1,15.E-05) carried out revealed a significant difference between the average volumes of biogas. However, multiple comparison tests reveal that T6 provides better performance in terms of biogas than T0. Finally, the biodigestion of cassava effluents can be considered as the best system to improve the production of biogas between the two biomass wastes from cassava processing in southern Benin.

Keywords: Benin, bio-digestion, Biogas, Cassava Peelings, Cow dung, Digester, Effluents

Contact Address: Thierry Gorlon Godjo, University of Science, Technology, Engineering and Mathematics, B.P. 2282, Abomey-Calavi, Benin, e-mail: thierrygodjohotmail.com