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Journal of Automated Methods and Management in Chemistry
Volume 2006, Article ID 90384, 5 pages

Comparison Study of Manometric Respirometric Test and Common Chemical Methods in the Determination of BOD7 in a Pulp and Paper Mill's Wastewaters

1Department of Chemistry, University of Oulu, P.O. Box 3000, Oulu 90014, Finland
2Stora Enso Oyj Veitsiluoto Mills, Kemi 94800, Finland
3Water Resources and Environmental Engineering Laboratory, University of Oulu, P.O. Box 4300, Oulu 90014, Finland
4The Town Planning Committee, The Environmental Research Division, City of Kemi, Valtakatu 26, Kemi 94100, Finland

Received 23 November 2005; Revised 29 June 2006; Accepted 6 September 2006

Copyright © 2006 Katri Roppola et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The biological oxygen demand (BOD) test is widely used in many wastewater treatment plants. The conventional BOD tests are usually time-consuming and the results are often out of date for process control purposes. The aim of this research was to compare the manometric respirometric test with common chemical methods in the determination of BOD of wastewater from a pulp and paper mills as well as to evaluate the BOD7 values of both wastewaters from the short-term respirometric measurements. The results showed that there were differences in the BOD7 values of paper mill samples measured by conventional and respirometric methods. The main cause was found to be the dilution solution used in the conventional BOD tests. Using the same mineral solution in the respirometric measurements diminished the difference remarkably. Evaluation of the BOD7 value after two or three days incubation was proved to work very well and the estimated results were close to measured values (deviations 1%–12%).