Pretreatment optimization, process control, mass and energy balances and economics of anaerobic co-digestion of Arachis hypogaea (Peanut) hull and poultry manure
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Elsevier
Abstract
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The study explored biogas production from the co-digestion of Arachis hypogaea hull and poultry droppings.
Mechanical and thermo-alkaline pretreatments were applied to a sample of the mixture.
Another sample was treated mechanically but without thermo-alkaline methods. Optimization was done
using the Response Surface Methodology (RSM) and the Artificial Neural Networks (ANNs). The optimal
values for each of the five major parameters optimized are Temperature of 32.00 �C, pH of 7.62, Retention
time of 30.00 day, Total solids of 12.00 g/kg and Volatile solids of 10.00 g/kg and the predicted biogas
yield for RSM was 3903.15 10�3 m3/kg TSfed and 3338.3 10�3 m3/kg TSfed for ANNs in the thermoalkaline
pretreated experiment. Gas chromatography show the CH4 and CO2 content of biogas generated
to be 65.5 ± 1.5%; 26 ± 1% and 53 ± 1%; 26 ± 2% respectively. The co-digestion of peanut hull with poultry
droppings and other energy-yielding substrates is further encouraged.
Keywords
QH Natural history, QH301 Biology, TP Chemical technology