Enhanced nitrogen removal in filled-and-drained vertical flow constructed wetlands: microbial responses to aeration mode and carbon source
| Autor: | Hui Wang, Yuqiang Zhao, Lai Xiaoshuang, Fuxia Pan, Yuan Yingrui, Wang Shuzhi, Baoshan Yang |
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| Rok vydání: | 2020 |
| Předmět: |
Denitrification
Nitrogen Health Toxicology and Mutagenesis chemistry.chemical_element Wetland 010501 environmental sciences 01 natural sciences RNA Ribosomal 16S Environmental Chemistry 0105 earth and related environmental sciences Pollutant Biological Oxygen Demand Analysis geography geography.geographical_feature_category Chemistry General Medicine Pollution Carbon Microbial population biology Anammox Environmental chemistry Wetlands Nitrification Aeration |
| Zdroj: | Environmental science and pollution research international. 27(30) |
| ISSN: | 1614-7499 |
| Popis: | For the purpose of enhancing the removal rate of nitrogen (N) and organic matters, intermittent aeration and carbon source were used in filled-and-drained vertical flow constructed wetlands (VFCWs). The results showed that the best removal of COD (74.16%), NH4+-N (93.56%), TN (86.88%), and NO3--N (79.65%) was achieved in VFCW1 (aerated with carbon source system). Illumina MiSeq300 high-throughput sequencing showed that carbon source aerated system increases the diversity and richness of the microbial community. The copy numbers of nitrification functional genes (nxrA, amoA), denitrification functional genes (nirS, nirK, nosZ), and anammox functional gene (anammox 16S rRNA) displayed various changes when applied different aeration modes and additional carbon source to each system. An increase of the DO concentration and carbon source facilitated the absolute abundance of microbial nitrification and denitrification functional genes, respectively. All in all, these results demonstrate that carbon source combined with intermittent aeration is valid to improve the pollutant treatment performance in these systems. |
| Databáze: | OpenAIRE |
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