Solid-state fermentation has a great advantage over submerged
processes, since this method employs agricultural
residues in their natural form, thus helping to prevent the
environmental impact caused by the accumulation of these
residues. Agricultural residues are an important source of
nutrients for several microorganisms used in fermentative
processes, and due to their similarity to the natural habitat
of the microorganisms, they serve as an adequate substrate
for microbial growth with the consequent formation of
products of industrial interest [1,2]. Agricultural residues
contain 20–30% hemicellulosic materials, which can be
utilized for production of xylanase by microorganisms. The
use of xylanases in wheat breadmaking [3], malting and
brewing [4], production of biscuits [5] and paper and pulp
bleaching [6] has attracted considerable attention because
of growing concern about the environmental damage caused
by the chemical industry. Information about xylanase production
by SSF systems in bioreactors is limited and few
studies deal with the production of enzymes by SSF using