pH in the reactor during one stage banana peel fermentation at varying F/M ratio in the range of 2.5 – 10 was
stable in the range of 6.72 – 7.30 (Fig. 1). The results implied that the banana peel might be composed of buffer
compounds that can maintain the fermentation pH to suit the methanogenic activity. Methane was produced after 12
h incubation for all F/M ratios with the methane content approximately