Development and application of a denitrification test based on gas ...
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Development and application of a denitrification test based on gas ...
B.R. Buys,* A. Mosquera-Corral,** M. Sánchez** and R. Méndez** *Wageningen Agricultural University, Department of Environmental Technology, P.O. Box 8129, 6700 EV, Wageningen, The Netherlands **Institute of Technology, Department of Chemical Engineering, University of Santiago de Compostela, Campus Sur s/n. 15706 Santiago de Compostela, Spain Abstract In order to assess the toxicity of compounds in wastewater and activities in reactors a precise, reproducible, fast and simple batch test is used. This research was focused on the development of such a test to determine denitrifying activity. The test is based on measuring the rate of gas production during denitrification, by tracking both the pressure and the gas composition in the headspace of a sealed bottle. The optimum pH for batch activity was found to equal the pH in the lab-scale reactor (9.5) from which the sludge originated. The minimum COD/N ratio required for linear gas production curves with acetate/nitrate was 3.5 g COD/g N. A significant increase in specific activity at low solids concentrations (
