MODELING OF ANAEROBIC CO-DIGESTION USING ORGANIC WASTE AND MANURE AS SUBSTRATE
Keywords:
Anaerobic digestion, vegetable residual, mesophilic, Box-Behnken designAbstract
This paper aims to investigate the effect of alkaline pretreatment concentration, the composition of organic waste, and organic loading rate on anaerobic digestion of mixed waste, consisting of pig manure and vegetable waste, on the production of bio-methane. Experiments were conducted in a 60 L semi-continuous polyethylene digester at ambient temperature using water displacement technique to monitor gas production. The optimized pretreatment and methane production conditions were found to be 2.0% (w/w) NaOH concentration, an organic loading rate of 1.2 kg VS m-3 d-1 and vegetable residual or 20 % in the organic waste. The amount of methane achieved at this optimized condition is 0.691 m3 kgVS-1. A second order polynomial equation was formulated to solve for the amount of methane produced. Predicted acquired from this formula was found to have an R2 of 97.7% which indicate that the predicted results were closed to the actual data obtained from the experiment. It can be concluded from the Box-Behnken design experiment that the pretreatment of vegetable residual with NaOH solution has a positive effect on the production of methane.
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