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Title: Effect of Co-Digestion of Poultry Litter with Kitchen Waste on Biogas Yield
Authors: Tufa Yadete
Meseret Chimdessa
Keywords: Organic carbon, Moisture contents, pH, Total solids, Volatile soli
Issue Date: Jan-2015
Publisher: Haramaya University
Abstract: 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 kitchen waste (KW) with poultry litter (PL) in five mix ratios was evaluated under mesophilic conditions (38ºC) using a batch digester in microbiology laboratory of Haramaya University. In all treatments, total solid (TS), volatile solid (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 25 days. All measured physico-chemical parameters of each substrate were significantly varied between before and after anaerobic digestion (AD), p <5%. Gas production was noticed in all of the substrate types from the first day of digestion experiment and became zero at the 25th days of digestion in all substrates. Assessment of cumulative biogas production revealed that the substrate in a mix ratio of 50%kitchen waste (KW) and 50% poultry litter(PL) 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 volatile solid (VS), and total solid (TS) reduction can be significantly enhanced when kitchen waste (KW) and poultry litter (PL) are co-digested in 1:1 ratio.
Appears in Collections:Biology

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