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Coupled Nitrification-denitrification Caused by Suspended Sediment (SPS) in Rivers: Importance of SPS Size and Composition Xinghui Xia, Zhimei Jia, Ting Liu, Sibo Zhang, and Liwei Zhang Environ. Sci. Technol., Just Accepted Manuscript • DOI: 10.1021/acs.est.6b03886 • Publication Date (Web): 30 Nov 2016 Downloaded from http://pubs.acs.org on November 30, 2016
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Environmental Science & Technology
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Coupled Nitrification-denitrification Caused by Suspended
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Sediment (SPS) in Rivers: Importance of SPS Size and Composition
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Xinghui Xia∗, Zhimei Jia, Ting Liu, Sibo Zhang, Liwei Zhang
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School of Environment, Beijing Normal University, State Key Laboratory of Water Environment
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Simulation/Key Laboratory of Water and Sediment Sciences of Ministry of Education, Beijing
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100875, China
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Corresponding author. Tel.: +86 10 58805314; fax: +86 10 58805314. E-mail address:
[email protected] (X. Xia). 1
ACS Paragon Plus Environment
Environmental Science & Technology
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Abstract
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Suspended sediment (SPS) is ubiquitous in rivers, and SPS with different particle sizes and
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compositions may affect coupled nitrification-denitrification (CND) occurring on SPS
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significantly. However, there is no related research report. In this work,
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technique was adopted to explore the CND in systems containing SPS (8 g L−1 and 1 g L−1)
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collected from the Yellow River with various particle sizes, including < 2, 2-20, 20-50, 50-100,
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and 100-200 µm. The results showed that the CND occurred on SPS and the CND rate was
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negatively related to particle size; both nitrification and denitrification rate constants increased
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with decreasing SPS particle size. For instance, SPS (8 g L−1) with a particle size below 2 µm
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had the highest 15N2 emission rate of 1.15 mg-N/(m3·d), which was 2.9 times that of 100-200 µm.
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This is because SPS with a smaller particle size had a larger specific surface area and a higher
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organic carbon content, which is beneficial for bacteria growth. Both the nitrifying and
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denitrifying bacteria population were positively correlated with CND rate (p
