This work demonstrates that coffee extract residue can be used for the generation of two distinct products, viz. ethanol and acti- vated carbons. The prospective end-use of abundant waste and waste feedstocks of lignocellulosic biomass is attractive and promising for the production of both fuel and adsorbent.
A straightforward method for ethanol production by saccharo- myces cerevisiae using different amounts, temperatures, substrate loading, fermentation time and with or without mild treatments was carried out. Higher yields of ethanol were obtained as the cell walls of the biomass with small particle sizes were exposed for the direct hydrolysis and fermentation. Based on the experiments, the optimal fermentation was determined as follows; temperature 30 C, yeast 30 mg g 1CER and a combined aqueous phase after cooking and solid residue fermentation after treatment. The result also conveys that there is a potential for ethanol production if conditions for further extraction of the hexose and pentose sugars are increased.
Highly developed mesoporous and microporous structures of activated carbons were prepared by both chemical and physical activation of the coffee extract residue. Depending on the activation method, concentration of acid and pyrolysis temperature, differen