Degradation and metabolization of the pigment-melanoidin in distillery effluent by the marine cyanobacterium Oscillatoria boryana BDU 92181

Melanoidin decolorization/degradation has not so far been attempted with cy anobacteria. In this study, we report the ability of a marine filamentous, non-heterocystous form Oscillatoria boryana BDU 92181 to use the recalcitra nt biopolymer melanoidin as nitrogen and carbon source leading to decoloriz ation. Indirect evidence through the study of nitrogen assimilating enzymes as well as direct evidence of using C-14 radiolabeled synthetic melanoidin confirm this ability. The organism decolorized pure melanoidin pigment (0. 1% W/V) by about 75% and crude pigment in the distillery effluent (5% V/V)b y about 60% in 30 days. The mechanism of color removal is postulated to be due to the production of hydrogen peroxide, hydroxyl anions and molecular o xygen, released by the cyanobacterium during photosynthesis. This study for the first time, has opened up the possibility of treating distillery efflu ent in a cost effective way using the marine cyanobacterium. (C) 2001 Elsev ier Science Inc. All rights reserved.