Low Dosage Chemical Treatment for Improved Oxygenation of Pulp Mill Effluents
Publication: Journal of Environmental Engineering
Volume 144, Issue 3
Abstract
Most pulp and paper mills use aerobic biological treatment for their effluents. Aeration is the single most energy intensive process of a treatment plant. Surfactants, commonly occurring in pulping wastewaters, have been shown to decrease the oxygen transfer rate. The aim of this study was to decrease the surface activity of surfactants and thereby increase the oxygen transfer rate in pulp mill effluents by the use of chemical pretreatment in very low doses. Trials using ferric iron showed statistically significant improvement on both and surface tension. No sludge was precipitated owing to the very low ferric iron dosage. The novel use of chemical pretreatment, in very low doses, aiming specifically at improving oxygen transfer rate, is a promising concept for reducing the need for aeration in wastewater treatment and thus lower the electricity requirement of the wastewater treatment plant.
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Acknowledgments
This study was performed as part of the multidisciplinary Industrial Graduate School VIPP – Values Created in Fiber Based Processes and Products—at Karlstad University, with the financial support of the Knowledge Foundation and Stora Enso Skoghall Mill. The authors thank Jari Appelgren at the Department of Statistics at Karlstad University for valuable comments.
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Published In
Journal of Environmental Engineering
Volume 144 • Issue 3 • March 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Feb 14, 2017
Accepted: Aug 10, 2017
Published online: Dec 23, 2017
Published in print: Mar 1, 2018
Discussion open until: May 23, 2018
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