ORIGINAL RESEARCH
The Fate of Ammonium in Integrated
Vertical-flow Constructed Wetlands
Using Stable Isotope Technique
Yun Hu1,2, Feng He1, Long Wang1,2, Jian Sun1,2, Tao Huang1,2, Zhenbin Wu1
1State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology,
Chinese Academy of Sciences, Wuhan 430072, China
2University of Chinese Academy of Sciences, Beijing 100049, China
Chinese Academy of Sciences, Wuhan 430072, China
2University of Chinese Academy of Sciences, Beijing 100049, China
Submission date: 2015-10-28
Final revision date: 2016-01-19
Acceptance date: 2016-01-22
Publication date: 2016-05-25
Pol. J. Environ. Stud. 2016;25(3):1027–1032
KEYWORDS
ammoniumplant uptakeintegrated vertical-flow constructed wetland15N tracerstable isotope technique15 N tracerstableisotope technique
TOPICS
ABSTRACT
The fate of ammonium (NH4+) was investigated using the 15N tracer stable isotope technique in
integrated vertical-flow constructed wetlands (IVCWs). Two types of IVCW systems were built: unplanted
IVCWs (control) and planted IVCWs. The results showed that a high NH4+ removal efficiency (95.4%) in
the planted IVCWs. Plants not only removed NH4+ by direct uptake (13.6±0.7%) but also improved the NH4+
removal capacity of IVCWs, compared with the control. Besides plant uptake, microbial conversion was the
dominant mechanism of NH4+ removal in IVCWs, and a large proportion (75.2-85.6%) of added NH4+ may
be permanently removed via anammox and nitrification-denitrification processes in IVCWs.
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