Decolorization of Molasses Waste Water by a Thermophilic Strain,Aspergillus fumigatus G-2-6 Sadahiro |
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Authors: | Sadahiro Ohmomo Yasuyuki Kaneko Suntud Sirianuntapiboon Praphaisri Somchai Poonsook Atthasampunna Isei Nakamura |
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Affiliation: | 1. Institute of Applied Biochemistry, University of Tsukuba, Tsukuba, Ibaraki 305, Japan;2. Thailand Institute of Scientific and Technological Research (TISTR), Bangkok 10900, Thailand |
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Abstract: | We screened for fungi that can decolorize molasses melanoidin in the tropical zone and isolated some strains, mainly in the genus Aspergillus. Of these, strain No. G-2–6 was most active and was identical with Aspergillus fumigatus based on detailed morphological studies.This strain decolorized about 75% of a molasses melanoidin solution when the strain was cultivated on a glycerol-peptone medium at 45°C for 3 days with shaking. In successive decolorization reusing the mycelia, this strain had more than 60% of the melanoidin-decolorizing activity at the eighth replacement in the presence of 4% glycerol.Continuous decolorization of molasses melanoidin solution in a jar fermentor had an almost constant decolorization yield of about 70% at a dilution rate of 0.014 hr-1. At the same time, about 51 % of the chemical oxygen demand and 56% of the total organic carbon in the initial solution were removed. In contrast, continuous decolorization of non-dialyzed molasses melanoidin solution removed a little more chemical oxygen demand and total organic carbon than those of dialyzed molasses melanoidin solution, but had a lower level of melanoidin-decolorizing activity (about 40%). |
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