Abstract
The combination of Irish potato waste (IPW) and poultry waste (PW) can form a synergy resulting into an effective substrate for a better biogas production due to some materials they contain. In this work, optimization and kinetic study of biogas production from anaerobic digestion of IPW and PW was investigated. Response surface methodology (RSM) was applied to optimize conditions such as initial pH, solids concentrations and waste ratios. The anaerobic digestion of the two wastes was carried out in the mesophilic condition and Box-Behnken design (BBD) was used to develop and analyze a predictive model which describes the biogas yield. The results revealed that there is a good fit between the experimental and the predicted biogas yield as revealed by the coefficient of determination (R2) value of 97.93%. Optimization using quadratic RSM predicts biogas yield of 19.75% at the optimal conditions of initial pH value 7.28, solids concentration (w/v) 9.85% and waste ratio (IPW:PW) 45:55%. The reaction was observed to have followed a first order kinetics having R2 and relative squared error (RSE) values of 90.61 and 9.63% respectively. Kinetic parameters, such as rate constant and half-life of the biogas yield were evaluated at optimum conditions to be 0.0392 day-1 and 17.68 days respectively. The optimum conditions and kinetic parameters generated from this research can be used to design real bio-digesters, monitor substrate concentrations, simulate biochemical processes and predict performance of bio-digesters using IPW and PW as substrate.
Highlights
Nigeria generates waste at the rate of 0.43 kg per person per day and the waste contains 60 to 80 percent of biodegradable wastes [1] & [2]
Anaerobic digestion of wastes is suitable for greenhouse gases (GHGs) mitigation and waste management practices and the benefits are the production of biogas for cooking, heating, lighting and electricity generation and the production of bio-fertilizer for agricultural land application
The use of Irish potato waste (IPW) and poultry waste (PW) as raw materials for biogas and bio-fertilizer production will reduce the volume of wastes dumped in solid waste disposal sites (SWDs) and the odour emanating from the poultry farms respectively
Summary
Nigeria generates waste at the rate of 0.43 kg per person per day and the waste contains 60 to 80 percent of biodegradable wastes [1] & [2]. Some activities at potato industries generate wastes which includes rotten potatoes, potato skins and tubers, those with defects due to mechanical damages and are rejected These residues have a high perishability and their quick removal and disposal is mandatory, with consequent high costs [5]. There have been many previous studies on the optimization and kinetics of biogas production from anaerobic digestion of agricultural slurries and energy crops or organic wastes [12], [13], [14], [15] & [16]. The aim of this research work is to carry out process optimization and kinetics study of biogas production from anaerobic digestion of Irish potato and poultry wastes. The kinetics parameter generated from this research can be used to size biodigesters, monitor substrate concentration, simulate biochemical processes and predict bio-digesters performance
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