Journal
ECOLOGICAL ENGINEERING
Volume 95, Issue -, Pages 83-89Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecoleng.2016.06.054
Keywords
Integrated vertical-Flow constructed wetland (IVCW); C/N ratio; Gene abundance; Partial nitrification-denitrification; Nitrogen removal pathway
Funding
- Shenzhen Habitat Environment Committee, Government of Special Administrative Region of Hong Kong
- Drainage Service Department, The Government of Special Administrative Region of Hong Kong
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In this study, the treatment performance of the integrated vertical-flow constructed wetland (IVCW) and nitrogen (N) removal mechanism of microbes were explored by quantitative PCR (qPCR) technology. The results showed that the IVCW pilot system could achieve high removal efficiencies of NH4+-N (above 90%), TN (55-90%) and TOC (above 95%) under 2, 4, 6, 8 C/N ratios. A close relationship exists between the abundance of nitrogen-removing microbes and water quality parameters of effluents. The abundance of bacterial 16S rRNA genes, amoA of ammonia oxidizing bacteria (AOB), nirS of denitrification bacteria and nxrA of nitrite oxidizing bacteria (NOB) in the down-flow chamber were higher than those of the up-flow chamber in IVCW. The relative abundance of amoA, nirS and nxrA suggested that AOB and denitrification bacteria were predominant in the nitrogen removal process, and thus the partial nitrification and denitrification appeared to be the main N removal process in the IVCW test system. (C) 2016 Elsevier B.V. All rights reserved.
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