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Title (Primary) Annual cycle of nitrogen removal by a pilot-scale subsurface horizontal flow in a constructed wetland under moderate climate
Author Kuschk, P.; Wießner, A.; Kappelmeyer, U.; Weißbrodt, E.; Kästner, M.; Stottmeister, U.;
Journal Water Research
Year 2003
Department UBT; UBT_alt;
Volume 37
Issue 17
Language englisch;
Keywords Annual cycle; Constructed wetland; Denitrification; Helophytes; Horizontal subsurface flow system; Moderate climate; Nitrification; Nitrogen removal; Oxygen supply
Abstract

The annual course of nitrogen removal in a stable operating subsurface horizontal flow constructed wetland (SSF) in a moderate climate was evaluated using a large pool of data from 4 years of operation. In spring and autumn removal efficiencies were found to depend on the nitrogen load in a linear mode. The efficiencies in winter and summer differed extremely (mean removal rates of 0.15/0.7gm(-2)d(-1) (11%/53%) in January/August) and were independent of the nitrogen load (0.7-1.7 g m(-2) d(-1)) in principle. Oscillations of the removal rates in spring, forming several maxima, suggest seasonal specific effects caused by the dynamics of the plant-physiology finally determining the nitrification efficiency, i.e. via O-2-supply. Nitrification is limited by temperature during all seasons and surprisingly in midsummer additionally restricted by other seasonal aspects forming a clear-cut relative nitrification minimum (mean rate of 0.43 g m(-2) d(-1) (32%)) in July. The importance and the effect of the plants' gas exchange and oxygen input into the rhizosphere are discussed. Denitrification was nearly complete in midsummer and was clearly restricted at seasonal temperatures below 15 degreesC.

ID 5012
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=5012
Kuschk, P., Wießner, A., Kappelmeyer, U., Weißbrodt, E., Kästner, M., Stottmeister, U. (2003):
Annual cycle of nitrogen removal by a pilot-scale subsurface horizontal flow in a constructed wetland under moderate climate
Water Res. 37 (17), 4236 - 4242