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Energy efficient aeration of wastewaters from the pulp and paper industry
Karlstad University, Faculty of Technology and Science, Department of Energy, Environmental and Building Technology.
2010 (English)In: Water Science & Technology, ISSN 0273-1223, Vol. 62, no 10, p. 2364-2371Article in journal (Refereed) Published
Abstract [en]

More than 50% of the electrical power needed to treat pulp and paper industry effluents is used for aeration in biological treatment stages. A large share of the oxygen that passes through the wastewater is not consumed and will be found in the off-gas. Energy can be saved by aerating under conditions where the oxygen transfer is most efficient, for example at low concentrations of dissolved oxygen Consider the sludge as an energy source; electricity can be saved by avoiding sludge reduction through prolonged aeration. High oxygen transfer efficiency can be retained by using the oxygen consumption of biosolids. Quantified savings in the form of needed volumes of air while still achieving sufficient COD reduction are presented. The tests have been made in a bubble column with pulp mill process water and sludge from a biological treatment plant. These were supplemented with case studies at three pulp and paper mills

Place, publisher, year, edition, pages
London: IWA , 2010. Vol. 62, no 10, p. 2364-2371
Keywords [en]
aeration, biosolids concentration, DO, energy efficiency, oxygen transfer, pulp mill wastewaters
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
URN: urn:nbn:se:kau:diva-10416DOI: 10.2166/wst.2010.946OAI: oai:DiVA.org:kau-10416DiVA, id: diva2:493950
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2015-06-25Bibliographically approved
In thesis
1. Efficient treatment of forest industrial wastewaters: Energy efficiency and resilience during disturbances
Open this publication in new window or tab >>Efficient treatment of forest industrial wastewaters: Energy efficiency and resilience during disturbances
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This work concerns the efficient treatment of wastewaters from pulp and paper mills by means of aerobic biological processes. For treatment processes there are many aspects of efficiency and the present study investigates both energy efficiency and purification efficiency during disturbances.

Special focus is put on wood extractives, such as resin acids and fatty acids, since they can cause negative effects in fish and other organisms in the receiving waters. They can furthermore be toxic to microorganisms in a biological treatment plant. They also affect oxygen transfer, which is important for energy efficient aeration of aerobic biological treatment processes.

This thesis includes five papers/studies and presents a strategy for efficient treatment of forest industrial wastewaters. The results should help creating resilient wastewater treatment strategies with efficient use of energy. One new strategy proposed here includes separation of extractives before the wastewater is treated biologically, and the use of the extra amount of sludge as an energy source, shifting the energy balance from negative to positive.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2012. p. 70
Series
Karlstad University Studies, ISSN 1403-8099 ; 2012:22
Keywords
Forest industry, wastewater, oxygen transfer rate, black liquor, surface active, extractives
National Category
Energy Systems Water Treatment
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-13031 (URN)978-91-7063-426-0 (ISBN)
Public defence
2012-06-07, Nyqvistsalen 9C203, Karlstads universitet, Karlstad, 09:15 (Swedish)
Opponent
Supervisors
Available from: 2012-05-24 Created: 2012-04-18 Last updated: 2018-07-16Bibliographically approved

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Publisher's full texthttp://www.iwaponline.com/wst/06210/wst062102364.htm

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