Abstract

Comparative Study of Bio-digestion of Cassava Peelings and Efflu-ents from Gari Production in South-East Benin

The objective of the study was to compare the bio-digestion of peelings and effluents, by products of the transformation of cassava into gari in southern Benin. The experimental device was a Ficher block comprising the following seven treatments, all with the addition of 400 g of water: 1^st treatment (T1) composed 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; T7 or control (T0 composed of 400 g of cow dung. The results showed that the biogas volume averages of the treatments T0, T1, T2, T3, T4, T5 and T6 were respectively of the order of 40.74 ml on the 25^th day, 11.74 ml on the 33^rd day, 13.48 ml on the 31^st day, 22.61 ml on the 29^th day, 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 biogas performance than T0.

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