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- W1984462140 abstract "Extensive environmental effects of the forest industry led to implementation of activated sludge treatment of effluents in the 1980s. Although the existence of chlorinated compounds in the effluents has decreased, a discussion about the possible environmental effects of elemental-chlorine-free (ECF) and total-chlorine-free (TCF) bleached pulp mill effluents has arisen, and chronic effects on aquatic organisms have still been found. Recently, studies have mainly focussed on wood extractives and their role in the effects of effluents. Resin acids and unsaturated fatty acids are found to be toxic, and plant sterols are reported to have adverse endocrine effects on water organisms already at low concentrations. In this study, Finnish wastewater treatment plants of an ECF kraft pulp mill, a paper mill, and an integrated TCF kraft pulp and paper mill were sampled in order to ascertain how wastewater treatment plants, and especially activated sludge treatments, remove wood extractives. Concentrations of extractives in discharged wastewaters varied between 0.4 and 11 g/t kraft or mechanical pulp, and the concentrations decreased over 95% during the treatment processes. Of the wood extractives, 1.1–64% were adsorbed to biosludge and 35–99% were degraded or transformed to other forms during the activated sludge treatment. A major part of these compounds were discharged in particles (74–99%). The removal of extractives was efficient even in the effluent treatment plant, which was highly loaded during the sampling period." @default.
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- W1984462140 date "2004-02-01" @default.
- W1984462140 modified "2023-10-12" @default.
- W1984462140 title "Fate of wood extractives in wastewater treatment plants at kraft pulp mills and mechanical pulp mills" @default.
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- W1984462140 doi "https://doi.org/10.1016/j.watres.2003.10.051" @default.
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