Abstract
In continuous starch wastewater treatment with Aspergillus niger pellets, stability of pellets and efficiencies of starch decomposition and total organic carbon (TOC) removal were considerably affected on both pH in the reactor and hydraulic retention time (HRT) . The form of pellets was maintained without bulking or collapsing under more than 20 days'operation in case that pH and HRT were set to 3.0 and 8 hrs, respectively. In addition, microbial contamina tion was effectively controlled and high efficiency of starch decomposition (80%) was obtained.However, negligible amount of TOC was removed. Since those residual components, containing glucose mainly, were thought to be degraded readily by activated microorganisms, experimental investigation of multi-stage treatment with the fungal and activated sludge processes was carried out. Consequently, starch and TOC from the starch wastewater were removed at 80% and it was suggested that multi-stage treatment process was effective for high strength starch wastewater.
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