Decolorisation of synthetic melanoidin and biogas effluent by immobilised fungal isolate of Aspergillus niger UM2

摘要

A fungal isolate, Aspergillus niger UM2 was immobilised on calcium alginate in order to enhance the efficiency of decolonisation through the biodegradation of pigments imparting color to post-methanated distillery effluent. The investigations were carried out on reduction of color intensity of synthetic melanoidin as well as biogeffluent in batch and successive manner at pH optima 4.5 and 5.5 respectively. The decolonisation of melanoidin by immobilised culture was increased from 60%to 72% and that of biogas effluent from 68%to 80% during first five days. The immobilised biomass at 21 days lost the ability to decolorise melanoidin in the absence of nitrogen source. However, even after 27 days decolorisa-tion yield of biogas effluent was maintained upto 15% in absence of nitrogen source.