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Mill Case, Simulation and Laboratory Plant Study of Black Liquor Spill Effects on a Multiple Stage Biological Treatment Plant
Karlstad University, Faculty of Technology and Science, Department of Energy, Environmental and Building Technology.
2009 (English)In: Canadian journal of civil engineering (Print), ISSN 0315-1468, E-ISSN 1208-6029, Vol. 36, no 5, p. 839-849Article in journal (Refereed) Published
Abstract [en]

In this study, the impact of black liquor shocks on multiple stage biological treatment plant was studied. The tests were carried out in a lab scale plant and using a mathematical simulation model. The results showed good relation to a parallel situation at the Gruvon Mill. The MultiBio concept is persistent to short-term black liquor spills due to the design where the black liquor is diluted between every compartment. According to the lab scale trials, short-term shocks (5 and 10 h) of black liquor addition reduce bio activity in the first part of the MultiBio plant. Oxygen uptake rate and chemical oxygen demand (COD) degradation decreased during high concentrations of black liquor and increased when the black liquor concentration declined. Protozoas disappeared from compartments exposed to high concentrations of black liquor. A long-term trial encompassing 24 h of black liquor addition inhibited the COD reduction in the whole plant for several weeks

Place, publisher, year, edition, pages
2009. Vol. 36, no 5, p. 839-849
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
URN: urn:nbn:se:kau:diva-9966DOI: 10.1139/S08-056OAI: oai:DiVA.org:kau-9966DiVA, id: diva2:493480
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2017-12-07Bibliographically 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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