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Influences of Iron Compounds on Microbial Diversity and Improvements in Organic C, N, and P Removal Performances in Constructed Wetlands

  • Microbiology of Aquatic Systems
  • Published:
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Abstract

The effects of various combinations of iron compounds on the contaminant removal performance in constructed wetlands (CWs) were explored under various initial iron concentrations, contaminant concentrations, different hydraulic retention time (HRT), and different temperatures. The Combo 6 (nanoscale zero-valent iron combined with Fe3+) in CW treatments showed the highest pollutant removal performance under the conditions of C2 initial iron dosage concentration (total iron 0.2 mM) and I2 initial contaminant concentration (COD:TN:TP = 60 mg/L:60 mg/L:1 mg/L) in influent after 72-h HRT. These results were directly verified by two different microbial tests (Biolog test and high-throughput pyrosequencing) and microbial community analysis (principal component analysis of community-level physiological profile, biodiversity index, cluster tree, relative abundance at order of taxonomy level). Specific bacteria related to significant improvements in contaminant removal were domesticated by various combinations of iron compounds. Iron dosage was advised as a green, new, and effective option for wastewater treatment.

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Authors and Affiliations

  1. College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, 201306, China

    Zhimiao Zhao, Xiao Zhang, Mengqi Cheng, Yinjiang Zhang & Xiangmei Zhong

  2. Engineering Research Center for Water Environment Ecology in Shanghai, Shanghai, 201306, China

    Zhimiao Zhao, Xiao Zhang, Mengqi Cheng, Yinjiang Zhang & Xiangmei Zhong

  3. State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, People’s road 2999, Donghua University academic building NO.4, office 5153, Songjiang District, Shanghai, 201620, China

    Xinshan Song

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  1. Zhimiao Zhao
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  2. Xiao Zhang
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  3. Mengqi Cheng
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  4. Xinshan Song
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  5. Yinjiang Zhang
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Correspondence to Xinshan Song.

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Highlights

• Ferrous ions produced by nZVI and ferric ions realized the longer and higher performance in CWs.

• Produced ferrous ions rearranged the microbial abundance and diversity in CWs.

• The direct microbiological evidence of iron-driven contaminant removal was given.

• Produced iron ions promoted TP removal through precipitation and optimizing microbial conditions.

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Zhao, Z., Zhang, X., Cheng, M. et al. Influences of Iron Compounds on Microbial Diversity and Improvements in Organic C, N, and P Removal Performances in Constructed Wetlands. Microb Ecol 78, 792–803 (2019). https://doi.org/10.1007/s00248-019-01379-7

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  • DOI: https://doi.org/10.1007/s00248-019-01379-7

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