Denitrification at low temperatures using a suspended carrier biofilm process.
The denitrification process was studied in a stirred lab-scale suspended carrier biofilm reactor at low temperatures (3-20 degrees C). The reactor was filled to 50% with Kaldnes K1 carriers. The denitrification rate showed only a rather weak dependence on the temperature, the rate at 3 degrees C being approximately 55% of that at 15 degrees C. The maximum denitrification rate obtained at 15 degrees C was 2.7 g NO(x)(-)-Nm(-2)carrier d (-1). The maximum denitrification rate at 3 degrees C during an 8-day period was found to be constant. During the 8 days, the hydraulic retention time was approximately 1.5h and the inlet NO(3)(-)-N concentration was 30 mg x l(-1).
Department of Biotechnology, Centre for Chemistry and Chemical Engineering, Lund University, PO Box 124, Lund SE-221 00, Sweden. ulrika.welander@biotek.lu.se
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Welander
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Mattiasson
D018441:Biofilms; D019149:Bioreactors; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008962:Models, Theoretical; D009584:Nitrogen / Q000378:metabolism*; D013696:Temperature; D014865:Waste Disposal, Fluid
D009584:Nitrogen