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From sanitation to clean energy: Biogas potential of three organic wastes collected in and around Douala city (Cameroon)
 
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1
THE UNIVERSITY OF DOUALA
 
2
THE UNIVERSITY OF DOUALA, Faculty of Science, Department of Plant Biology
 
3
THE UNIVERSITY OF DOUALA, Faculty of Science, Department of Biochemestry
 
4
Department of Aquatic Ecosystems Management, Institute of Fisheries and Aquatic Sciences at Yabassi, The University of Douala, P.O. Box 7236 Douala, Cameroon
 
5
Department of Processing and Quality Control of Fisheries Products at Yabassi, The University of Douala, P.O. Box 7236 Douala, Cameroon
 
6
Department of Fisheries Management, Institute of Fisheries and Aquatic Sciences at Yabassi, The University of Douala, P.O. Box 7236 Douala, Cameroon
 
 
Corresponding author
NDONGO DIN   

THE UNIVERSITY OF DOUALA
 
 
J. Ecol. Eng. 2024; 25(8)
 
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ABSTRACT
Waste management is a major concern in large cities under heavy demographic pressure. Landfill, the oldest form of solid waste management is gradually being replaced by new technics such as biométhanisation. With the purpose of contributing to the achievement of one of the Sustainable Development Goals, particularly SDG7 (affordable and clean energy), the aim of this study is to assess the fermentable fraction of organic wastes into biogas. This survey was carried out in and around Douala city. Biological material consisted of water hyacinth (WH), household wastes (HW), oil palm wastes (OPW) and a mixture of these three substrates (MS) was collected and introduced with cow dung used as inoculum in a biodigester. Some physico-chemical parameters of substrates were determined. Results have shown that substrates used have a pH around neutral. The C/N ratio has shown an excess of nitrogen in the WH, but a deficit in the OPW and MS. The household wastes have presented an ideal ratio for the biological stability of the anaerobic digestion system (21.153 ± 0.695). At the end of the experimentation, a large degradation of organic matter has been observed with COD decrease rates of 37.55 ± 0.12 % (WH), 45.46 ± 0.60% (HW), 48.27 ± 0.34% (OPW) and 46.71 ± 0.26% (MS). All air chambers were inflated and the combustion has shown a blue flame, proof of very high proportions of methane in the flammable biogas. A sanitation process has led to clean energy production.
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