The Influence of Volume and Surface Loading of Denitrification Reactor with Granulated Biomass on the Denitrification Degree of Wastewater from Sewage Treatment Plant

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L. Babjaková, I. Jonatová, Z. Imreová, and M. Drtil

Department of Environmental Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology, Bratislava


Post-denitrification of real municipal wastewater in an upflow sludge bed reactor with anoxic granulated biomass was tested. The nitrate contents were reduced with methanol from an average 21 mg l–1 to less than 3 mg l–1 at the loading 0.8 and 1.4 kg m–3 d–1 at 9–12 and 13–15 °C, respectively. Solids suspended in effluent were lower than 37 mg l–1 at hydraulic loadings 0.7–2.8 m3 m–2 h–1. At higher loadings (3.5–6 m3 m–2 h–1) the granulated biomass was disintegrated and gradually washed out from the reactor. Specific production of biomass was 0.16–0.17 gbiomass g–1 CODmethanol.


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