NDLI: Microbial nitrogen transformation in constructed wetlands treating contaminated groundwater

Content Provider	Springer Nature Link
Author	Coban, Oksana Kuschk, Peter Wells, Naomi S. Strauch, Gerhard Keller, Kay
Copyright Year	2014
Abstract	Pathways of ammonium (NH$_{4}$ $^{+}$) 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$_{4}$ $^{+}$ removal in all CWs, what was illustrated by lower NH$_{4}$ $^{+}$-N removal by the unplanted HSSF CW in comparison with planted CWs. No statistically significant differences in NH$_{4}$ $^{+}$ removal efficiencies between seasons were detected. Even though plant uptake accounted for 32–100 % of NH$_{4}$ $^{+}$ removal during spring and summer in planted CWs, throughout the year, most of NH$_{4}$ $^{+}$ was removed via simultaneous nitrification-denitrification, what was clearly shown by linear increase of δ$^{15}$N-NH$_{4}$ $^{+}$ with decrease of loads along the flow path and absence of nitrate (NO$_{3}$ $^{−}$) accumulation. Average yearly enrichment factor for nitrification was −7.9 ‰ for planted HSSF CW and −5.8 ‰ for FPRM. Lack of enrichment for δ$^{15}$N-NO$_{3}$ $^{−}$ 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$_{4}$ $^{+}$ rich inflow water.
Starting Page	12829
Ending Page	12839
Page Count	11
File Format	PDF
ISSN	09441344
Journal	Environmental Science and Pollution Research
Volume Number	22
Issue Number	17
e-ISSN	16147499
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-09-20
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nitrogen Ammonium Constructed wetland Nitrification Denitrification Isotope fractionation Environment Environmental Chemistry Ecotoxicology Environmental Health Atmospheric Protection/Air Quality Control/Air Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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