Comparative Study of Bioethanol Yield from Selected Agro-waste Feedstocks Using Fermentative Saccharomyces Cerevisias
Abstract
Bioethanol is a biofuel produced from renewable biological sources that is currently used in many countries as a safer substitute for fossil fuels. This study investigated the potential of rice husk, cassava, potato and yam peels as biomass for bioethanol production using Saccharomyces cerevisiae. The feedstocks were pre-treated with 50 mL of 0.1 M HCl at 50 ºC for 20 min and hydrolysed at 100ºC with 100 mL of 2 M HCl. Thereafter, the pH of the samples was adjusted using equal conc. of NaOH and fermented using 10 g of Saccharomyces cerevisiae for 96 h. It was then distilled at 81 – 83
ºC. The result showed that the dissolved sugar concentration was significantly higher in potato peels than in yam peels (P = 0.004) and cassava peels (P = 0.045) but insignificant compared to rice
husk (P = 0.158). However, the concentration of ethanol produced from rice husk (11.74±6.01% (v/v)) was slightly higher than potato peels (9.75±1.77% (v/v)); cassava peels (5.00±3.53% (v/v)) and yam peels (4.00±4.96% (v/v)), with no significant difference between them (P>0.05). Further investigation showed that, only 47.96% of the hydrolysate from rice husk, 39.06% from cassava peels, 33.27% from yam peels and 25.41% from potato peels were converted to ethanol and other by-products. The selected feedstocks showed good potential for bioethanol production especially the rice husk, and as
such; commercial production is recommended for effective utilization and downstream applications
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