Factors affecting slime accumulation in fiberboard mill process water Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/j3860b35k

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  • The objectives for this study were to determine the causes of slime formation in activated sludge treatment and to recommend possible control measures. The primary problem was a seasonal filamentous bulking which was caused by the mold, Geotrichum candidum. During the winter, mycelial fibers appeared and formed a free floating mesh which harbored a community of bacteria, yeasts and rotifers. The highly encapsulated mycelial filaments were assumed to utilize the free wood sugars to form its capsular polymer. The biological transformation of free wood sugars into polymerized slime could be followed through the treatment steps by gas liquid chromatography. The research data indicated that by by-passing the primary settling basin, thus avoiding the anaerobic degradation of the free wood sugars, the formation of the troublesome polysaccharides in the aeration pond could be avoided. After a rapid screening to remove the particulate matter, direct aeration at a pH of approximately 7.0 allowed a well balanced, nonfilamentous, microbial population to predominate.
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