| Literature DB >> 26897412 |
Yun Hu1, Feng He2, Lin Ma3, Yi Zhang3, Zhenbin Wu3.
Abstract
Microbial nitrogen (N) removal pathways in planted (Canna indica L.) and unplanted integrated vertical-flow constructed wetland systems (IVCWs) were investigated. Results of, molecular biological and isotope pairing experiments showed that nitrifying, anammox, and denitrifying bacteria were distributed in both down-flow and up-flow columns of the IVCWs. Further, the N transforming bacteria in the planted IVCWs were significantly higher than that in the unplanted ones (p<0.05). Moreover, the potential nitrification, anammox, and denitrification rates were highest (18.90, 11.75, and 7.84nmolNg(-1)h(-1), respectively) in the down-flow column of the planted IVCWs. Significant correlations between these potential rates and the absolute abundance of N transformation genes further confirmed the existence of simultaneous nitrification, anammox, and denitrification (SNAD) processes in the IVCWs. The anammox process was the major N removal pathway (55.6-60.0%) in the IVCWs. The results will further our understanding of the microbial N removal mechanisms in IVCWs.Entities:
Keywords: Anammox; Integrated vertical-flow constructed wetland; Isotope pairing technique; Nitrogen removal pathway; Nitrogen transformation functional gene
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Year: 2016 PMID： 26897412 DOI： 10.1016/j.biortech.2016.01.106
Source DB: PubMed Journal: Bioresour Technol ISSN： 0960-8524 Impact factor: 9.642