Open AccessOptimization of Biogas Production by Co-Digestion of Organic Waste (Cow Dung and Water Hyacinth)
Author(s) -
Alfred Dèdonougbo Dohou,
Gabin Koto N’Gobi,
Clément Kouchade,
Basile Kounouhéwa
Publication year - 2021
Publication title -
th wildau engineering and natural sciences proceedings
Language(s) - English
Resource type - Journals
ISSN - 2748-8829
DOI - 10.52825/thwildauensp.v1i.12
Subject(s) - hyacinth , biogas , cow dung , environmental science , eichhornia crassipes , pulp and paper industry , anaerobic digestion , agronomy , methane , biogas production , aquatic plant , waste management , zoology , chemistry , biology , ecology , engineering , fertilizer , macrophyte , organic chemistry
The objective of this work is to determine the co-digestion ratio of water hyacinth and cow dung for the optimization of biogas production at Sô Ava, a lake city of Southern Benin. To achieve these ratios, we suppose that the water hyacinth has a high gas yield and cow dung ensures stability in the biodigester because it brings fresh bacteria and has a strong buffering capacity (maintenance of a stable pH). For 45 days, we have introduced a mixture of water hyacinth and cow dung in 5 mini-biodigesters of 10 liters each: digester no1 (100% of cow dung); digester no2 (100% of the water hyacinth); digester n° 3 (50% of the water hyacinth and 50% of the cow dung); digester no4 (75% of cow dung and 25% of water hyacinth); digester no5 (75% of the water hyacinth and 25% of the cow dung). The measurements of the pH, temperature and the proportion of gas (CH4, CO2, O2 and H2S) in the mini-biodigesters was done. The measurements show that the digester n° 5 produces the highest capacity of 15.24L of biogas with 70% of methane while the digester n °2 has the lowest capacity 5.47L of biogas with 58% methane. These results show that the yield of biogas produced is greater when using the mixture of the substrate with the ratio of 75% of water hyacinth and 25% of cow dung. This result encourages the energy recovery from water hyacinth, once considered as a seasonal plague which hinders navigation of local boat in the lake.