Wastes used in this research paper were Orange and plantain peels with the addition of catalyst (clay). From the experiment carried out, the co-digestion of orange and plantain peels was the first to become flammable. The retention time was 66 days during which the ambient temperature and slurry temperature fluctuated between 22°C to 42°C which is within the range of mesophilic temperature. Orange peel, plantain peel and Orange/plantain became combustible on 64th,55th, and 31st day respectively. Calorific values of the samples were 15,213.85 KJ/Kg, 18,309.35 K J/Kg, and 16761.60 KJ/Kg respectively. Biochemical demands and chemical demand were obtained. The biogas produced was analyzed using biogas analyzer. The methane composition of the biogas produced were 70.70 %, 82.99 % and 77.85 % respectively. The proximate analysis of the samples was done. The Ash content was 0.35% for Orange peel, 0.55% for plantain peel and 0.41% for Orange/plantain due to the co-digestion process. The total viable count of the samples was also done.
This study presented the effects of catalyst and co-digestion on the performance of biogas production. Rabbit dung and plantain peels were used as feedstock materials while clay, KOH and NaOH were used as catalysts. The experiment was divided into five setups. The slurry stayed in the digester for 45days. The digester temperature fluctuated around 35-47°C while the pH varied from 6.8-7.8. The result of the analysis revealed that the gas produced has high methane content values from 69.75 – 72.38% with low CO2 concentration values from 7.16 - 15.41%. Total volume of biogas were noted to be 74L, 31.9L, 125.5L, 112.4L and 55.8L for each sample. The physicochemical properties revealed that the TS varied from 3.63% - 4.20%, while VS varied from 3.17% - 3.78%. The TOC ranged from 2.18% - 4.79% while the nitrogen content ranged within 0.195% - 0.352%, Crude fibre ranged from 3.15 – 3.81%. Ash content ranged within 3.21 – 4.50% and moisture content varied between 82.47 – 90.05%. The COD and BOD were also obtained. The calorific values of the samples obtained ranged from 17,600 – 20,184KJ/kg. The phosphorus content was between 0.25% and 0.40% while potassium was between 0.15 and 0.37% on average.
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