Degradation of paper mill water components in laboratory tests with pure cultures of bacteria |
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Authors: | Lenita E. Lindberg Bjarne R. Holmbom Outi M. Väisänen Assi M-L. Weber Mirja S. Salkinoja-Salonen |
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Affiliation: | (1) Aring;bo Akademi Process Chemistry Group, c/o, Laboratory of Forest Products Chemistry, Porthansgatan 3, FIN-20500 Turkuåbo, Finland Author for correspondence, e-mail;(2) Present address: Department of Applied Chemistry and Microbiology, University of Helsinki, P.O. Box 56, FIN-00014 University of Helsinki, Finland;(3) Metsä-Serla Group, Corporate R & D, P.O. Box 44, FIN-08701 Virkkala, Finland |
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Abstract: | The degradation of dissolved and colloidal substances from thermomechanical pulp (TMP) by bacteria isolated from a paper mill was studied in a laboratory slide culture system.Burkholderia cepacia strains hydrolysed triglycerides to free fatty acids, and the liberated unsaturated fatty acids were then degraded to some extent. Saturated fatty acids were not notably degraded. However, the branched anteiso-heptadecanoic fatty acid was degraded almost like the unsaturated fatty acids. About 30% of the steryl esters were degraded during 11 days, increasing the concentrations of free sterols. Approximately 25% of the dehydroabietic, and 45% of the abietic and isopimaric resin acids were degraded during 11 days. The degree of unsaturation seemed to be of greater importance for the degradation of fatty acids than the molar mass. No degradation of dissolved hemicelluloses could be observed with any of the nine bacterial strains studied. Burkholderia cepacia strains and one Bacillus coagulans strain degraded monomeric fructose and glucose in winter TMP water, but in summer TMP water, with much lower sugar concentrations, also otherBacillus strains degraded monomeric sugars. |
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Keywords: | Burkholderia cepacia hemicelluloses monomeric sugars resin acids sterols wood extractives |
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