We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Microbial nitrogen transformation in constructed wetlands treating contaminated groundwater.
- Authors
Coban, Oksana; Kuschk, Peter; Wells, Naomi; Strauch, Gerhard; Knoeller, Kay
- Abstract
Pathways of ammonium (NH) removal were investigated using the stable isotope approach in constructed wetlands (CWs). We investigated and compared several types of CWs: planted horizontal subsurface flow (HSSF), unplanted HSSF, and floating plant root mat (FPRM), including spatial and seasonal variations. Plant presence was the key factor influencing efficiency of NH removal in all CWs, what was illustrated by lower NH-N removal by the unplanted HSSF CW in comparison with planted CWs. No statistically significant differences in NH removal efficiencies between seasons were detected. Even though plant uptake accounted for 32-100 % of NH removal during spring and summer in planted CWs, throughout the year, most of NH was removed via simultaneous nitrification-denitrification, what was clearly shown by linear increase of δN-NH with decrease of loads along the flow path and absence of nitrate (NO) accumulation. Average yearly enrichment factor for nitrification was −7.9 ‰ for planted HSSF CW and −5.8 ‰ for FPRM. Lack of enrichment for δN-NO implied that other processes, such as nitrification and mineralization were superimposed on denitrification and makes the stable isotope approach unsuitable for the estimation of denitrification in the systems obtaining NH rich inflow water.
- Subjects
NITROGEN; CONSTRUCTED wetlands; GROUNDWATER; ARTIFICIAL habitats; NATURAL resources
- Publication
Environmental Science & Pollution Research, 2015, Vol 22, Issue 17, p12829
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-014-3575-3