3.1. Acid pretreatmen ts and enzyme hydrolysis ofspent coffee grounds
Utilizing the spent coffee grounds asthe feedstock for bioetha-
nol presents several advantages, especially incomparison toother
types of feedstock.For example,the spent coffee grounds are not
edible and can beeasily collected from the food industry (Murthy
and Madhava Naidu, 2012;Nunes etal.,2009 ). Thus,the recovery
of bioethanol from this waste material would beadesirable end
use.