Acceleration of denitrification in turbid rivers due to denitrification occurring on suspended sediment in oxic waters
Abstract
High suspended sediment (SPS) concentration exists in many rivers of the world. In the present study, the effects of SPS concentration on denitrification were investigated in airtight chambers with sediment samples collected from the Yellow River which is the largest turbid river in the world. Results from the nitrogen stable ((15)N) isotopic tracer experiments showed that denitrification could occur on SPS in oxic waters and the denitrification rate increased with SPS concentration; this was probably caused by the presence of low-oxygen microsites in SPS. For the water systems with both bed-sediment and SPS, the denitrification kinetics fit well to Logistic model, and the denitrification rate constant increased linearly with SPS concentration (p < 0.01). The denitrification caused by the presence of SPS accounted for 22%, 38%, 53%, and 67% of the total denitrification in systems with 2.5, 8, 15, and 20 g L(-1) SPS, respectively. The activity of denitrifying bacteria in SPS was approximately twice that in bed-sediment, and the denitrifying bacteria population showed an increasing trend with SPS concentration in both SPS and bed-sediment, leading to the increase of denitrification rate with SPS concentration. Furthermore, the denitrification in bed-sediment was accelerated by increased diffusion of nitrate from overlying water to bed-sediment under agitation conditions, which accompanied with the presence of SPS. When with 8 g L(-1) SPS, approximately 66% of the increased denitrification compared to that without SPS was attributed to denitrification on SPS and 34% to agitation conditions. This is the first report of the occurrence of denitrification on SPS in oxic waters. The results suggest that SPS plays an important role in denitrification in turbid rivers; its effect on nitrogen cycle should be considered in future study.
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The Yellow River is the largest turbid river in the world.
“Because the Yellow River is the largest turbid river in the world (Liu et al., 2013)”
From Short- and long-chain perfluoroalkyl substances in the water, suspended particulate matter, and surface sediment of a turbid river (2016) · cites this paper as Liu et al., 2013
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Self-citation
- Authors
- Liu, T., Xia, X., Liu, S., Mou, X., & Qiu, Y.
- Affiliations
- Beijing Normal University (CN)
- National University of Singapore (SG)
- Corresponding author
- Xia, Xinghui
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2013-04-15
- Volume
- 47
- Issue
- 9
- Pages
- 4053-4061
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2319426272
- Cited by
- 177
- References
- 43
- Citations by year
- 2026: 13 · 2025: 13 · 2024: 27 · 2023: 11 · 2022: 25 · 2021: 19 · 2020: 15 · 2019: 11 · 2018: 13 · 2017: 11 · 2016: 9 · 2015: 4 · 2014: 4 · 2013: 2
- FWCI
- 5.05
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Soil and Water Nutrient Dynamics
- Physical Sciences › Environmental Science › Pollution › Wastewater Treatment and Nitrogen Removal
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
- Keywords
- denitrification, suspended sediment, turbid rivers, denitrifying bacteria, denitrification kinetics, nitrate diffusion, bed sediment, Yellow River, nitrogen cycling
- MeSH terms
- Bacteria, Base Sequence, Oxygen, Polymerase Chain Reaction, DNA Primers, Geologic Sediments, Rivers, Denitrification
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