Abstract
Eight strains of filamentous fungi, which were known as producers of amylase and glucoamylase for digesting raw starch, were used for investigating treatment capacity of the synthetic cassava starch processing (SCSP) wastewater containing pure cassava starch. Among these strains, three strains of Aspergillus oryzae showed high efficiency in the removal of COD and TOC, starch hydrolysis and production of fungal biomass. With A. oryzae KCC F-0010, treatment efficiency obtained 72% (TOC), 81% (COD), 94% (starch) and 2.4 g/l of biomass after 14-day incubation. The presence of cyanide caused inhibition for the growth of fungi. The toleration of A. oryzae IFO 30113 to cyanide was associated with its ability to remove cyanide. Ammonia was indicated as the end product of biodegradation of cyanide. Volatilization and microbial metabolism were shown as the main mechanisms in the cyanide removal of the aerobic treatment process by fungi under the acidic condition.
