Purifying capability, enzyme activity, and nitrification potentials in December in integrated vertical flow constructed wetland with earthworms and different substrates

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• 作者：Defu Xu ; Jiaru Gu ; Yingxue Li ; Yu Zhang…
• 关键词：Substrate ; Eisenia fetida ; Enzyme activity ; Nitrification potentials ; Purifying capability
• 刊名：Environmental Science and Pollution Research
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：23
• 期：1
• 页码：273-281
• 全文大小：1,464 KB
• 参考文献：APHA, AWWA and WEF (1992) Standard methods for the examination of water and wastewater, 18th edn. American Public Health Association, AWWA and WEF, Washington
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• 作者单位：Defu Xu (1) (2) (3)
  Jiaru Gu (2)
  Yingxue Li (4)
  Yu Zhang (2)
  Alan Howard (5)
  Yidong Guan (2)
  Jiuhai Li (2)
  Hui Xu (2)
  
  1. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing, 210044, China
  2. School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China
  3. Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing, 210044, China
  4. Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing, 210044, China
  5. Department of Geography and Environmental Science, University of Reading, Reading, RG6 6AB, UK
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

The response of purifying capability, enzyme activity, nitrification potentials, and total number of bacteria in the rhizosphere in December to wetland plants, substrates, and earthworms was investigated in integrated vertical flow constructed wetlands (IVFCW). The removal efficiency of total nitrogen (TN), NH₄–N, chemical oxygen demand (COD), and total phosphorus (TP) was increased when earthworms were added into IVFCW. A significantly average removal efficiency of N in IVFCW that employed river sand as substrate and in IVFCW that employed a mixture of river sand and Qing sand as substrate was not found. However, the average removal efficiency of P was higher in IVFCW with a mixture of river sand and Qing sand as substrate than in IVFCW with river sand as substrate. Invertase activity in December was higher in IVFCW that used a mixture of river sand and Qing sand as substrate than in IVFCW which used only river sand as substrate. However, urease activity, nitrification potential, and total number of bacteria in December was higher in IVFCW that employed river sand as substrate than in IVFCW with a mixture of river sand and Qing sand as substrate. The addition of earthworms into the integrated vertical flow constructed wetland increased the above-ground biomass, enzyme activity (catalase, urease, and invertase), nitrification potentials, and total number of bacteria in December. The above-ground biomass of wetland plants was significantly positively correlated with urease and nitrification potentials (p < 0.01). The addition of earthworms into IVFCW increased enzyme activity and nitrification potentials in December, which resulted in improving purifying capability.