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Title: Biogas Production from Water Hyacinth (Eichhornia Crassipes) Co-Digestion with Cow Dung
Authors: Melkamu Fekadu
Meseret Chimdessa
Keywords: Biogas, Co-digestion, Cow dung, Total solids, Volatile solids
Issue Date: Aug-2014
Publisher: Haramaya University
Abstract: Water hyacinth is considered as a noxious weed in many parts of the world as it grows very fast and depletes nutrient and oxygen rapidly from water bodies, adversely affecting flora and fauna. The objective of this study was to determine biogas yield using water hyacinth (Eichhornia crassipes) as a sole substrate and co-digestion with cow dung. Production of biogas through anaerobic digestion of organic waste materials provides an alternative environmentally friendly renewable energy. In this study, biogas production from co-digestion of the water hyacinth with cow dung in five mix ratios was evaluated under mesophilic conditions (38ºC) using a batch digester in microbiology laboratory of Haramaya University ,but it should be carried out at room temperature (20oC) and at termophilic condition (55OC). In all treatments, TS, VS, organic carbon, percent moisture content and pH were measured before and after digestion. The daily biogas production was subsequently measured by water displacement method for 32days. All measured physico-chemical parameters of each substrate were significantly varied between before and after AD, p <5%. Gas production was noticed in all of the substrate types from the first day of digestion experiment and zero at the 32 days in all substrates. Assessment of cumulative biogas production revealed that substrate in a mix ratio of 25% EC and 75% CD showed the highest biogas production, suggesting this mix ratio of the two substrates is an optimal mix to yield better amount of biogas. Overall results indicate that the increment of biogas yield and VS, and TS reduction can be significantly enhanced when EC and CD are co-digested
Appears in Collections:Biology

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