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Growth kinetics of Rhizopus arrhizusMUCL 28168 were determined for different treatments of cassava during solid state fermentation. The best case gave a specific growth rate (μ) of 0.24 h-1, a yield calculated on a basis that oxygen consumption (Yx/o) was 2.9 g biomass. g-1O2consumed and the maintenance coefficient (m) was 0.004 g O2consumed. g-1biomass. h-1.

Recovery of cellulases from solid state cultures ofTrichoderma harzianumwas efficiently achieved by hydraulic pressing. Pressing of fermented solids yielded carboxymethyl-cellulase (CMCase) extraction efficiency of 71% and a ratio of leachate to fermented solids of 0.58 (v/w). Addition of water to pressed solids and second pressing improved the efficiency (95%) with simultaneous increase in the ratio to 1.16 (v/w). The overall extraction of filter paper activity was lower (85%) than that of CMCase. This technique is simple and its extraction efficiency is similar to that obtained in multiple-contact counter-current systems. The hydraulic press in its individuality was not used earlier to leach the product from fermented solids.