Abstract
This study focuses on the production of biogas from slaughter house waste to generate optimal methane yield which has high calorific value under optimum temperature, pH and substrate proportion (blood, manure and undigested food material). In this study, two different kinds of experiment were done. The first experiment was carried out to determine the pH, total solid, volatile solid and ash content of each type of waste fermented independently at optimal temperature (35°C) and pH 7. The second experiment was done by mixing three types of wastes based on crossed D-optimal design expert software, a well-accepted statistical technique used to design and optimize the experimental process. It involves choosing the optimal experimental design and estimating the effect of the several variables which have 42 runs at different proportions of the substrates. After the experiment, the following parameters: methane content and volume of biogas, pH, temperature, total solid, volatile solids, and ash content of each type of waste were determined. From individual type of 0.351 sample waste (blood, manure and undigested content), maximum biogas production and methane composition obtained were 01, 71, 41 and 0%, 66% and 54%, respectively. From the 42 runs experimental result, the best optimal methane composition and biogas produced were 79.26% and 0.381 l/g, respectively. Optimal conditions included 20% blood, 20% manure, and 60% undigested content substrate at pH 7.88 and t 32.49°C temperature. Key words: Digester, biogas, methane, anaerobic digestion, abattoirs.
Highlights
Nowadays, the discharge of wastes and demand of energy is increasing from time to time because of fast growing population, urbanization and industrialization
In Ethiopia, enough attention has not yet been given to biogas production from slaughter house waste; the countries are among methane emitter countries (Global Methane Initiative, 2011)
This can be used as source of energy for abattoir and for mitigating greenhouse gases by decreasing methane being emitted into the atmosphere from slaughter house wastes and livestock industry
Summary
The discharge of wastes and demand of energy is increasing from time to time because of fast growing population, urbanization and industrialization. In Ethiopia, enough attention has not yet been given to biogas production from slaughter house waste; the countries are among methane emitter countries (Global Methane Initiative, 2011) They are not gaining enough amount of advantage from the resource like bio-slurry which can produce organic fertilizer. The byproduct of biogas production, bio-slurry can be used as input for fish farming in commercial fish ponds This project aims at utilizing abattoir wastes to produce bio gas from the abundant resource of slaughter house waste by using anaerobic digestion. This can be used as source of energy for abattoir and for mitigating greenhouse gases by decreasing methane being emitted into the atmosphere from slaughter house wastes and livestock industry
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