OPTIMIZATION OF CASSAVA EFFLUENT BIOMETHANIZATION WITH ASH AS COSUBSTRATE
Journal: International Journal of Advanced Research (Vol.11, No. 09)Publication Date: 2023-09-19
Authors : Kpata-Konan Nazo Edith Kouame Francis; NGBADJO Tanon Virginie;
Page : 1190-1197
Keywords : Anaerobic Digestion Effluent Biogas;
Abstract
The main objective of this study is to determine the optimal conditions for anaerobic biodigestion of cassava effluents with the ash of cassava peels as co-substrate. To do this, three (03) digesters were used in which were put effluent + ash for digester 1, effluent + ash + cow dung for digester 2 and effluent + ash + urine for digester 3. The physico-chemical parameters (temperature, pH), biochemical parameters (COD and TKN) and the volume of biogas produced were quantified. In each of the reaction media a decrease in values was observed in pH (digester 1: 7.15 to 6.92 digester 2: 7.20 to 5.38 digester 3: 7.00 to 5.28), COD (digester 1: 1.66g/l to 1.16g/l digester 2: 1.81g/l to 1.44g/l digester 3: 1.46g/l to 0.99g/l) and NTK (digester 1: 0.27 g/l to 0.24 g/l digester 2: 0.29 g/l to 0.22 g/l digester 3: 0.25 g/l 0.16 g/l). ¨For the temperature of the media, the recorded values are in the range of mesophilic fermentation (digester 1: 26.66°C, digester 2: 27.97°C and digester 3: 27°C). Regarding gas production, the digesters produced gas from day 1 with 37.463 m3, 37.463 m3 and 69.272 m3 respectively. A significant improvement in the biogas production rate was observed in all digesters. Thus, the ash could be used as a replacement for human urine for pH adjustment of cassava effluents.
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