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WENG Rui, WEI Zheng, YANG Yanmei, HAN Jing, HE Yan, HUANG Minsheng. Characteristics of dissolved organic matter and its effects on denitrification in urban river sediments[J]. Journal of East China Normal University (Natural Sciences), 2021, (4): 46-54. doi: 10.3969/j.issn.1000-5641.2021.04.006
Citation: WENG Rui, WEI Zheng, YANG Yanmei, HAN Jing, HE Yan, HUANG Minsheng. Characteristics of dissolved organic matter and its effects on denitrification in urban river sediments[J]. Journal of East China Normal University (Natural Sciences), 2021, (4): 46-54. doi: 10.3969/j.issn.1000-5641.2021.04.006

Characteristics of dissolved organic matter and its effects on denitrification in urban river sediments

doi: 10.3969/j.issn.1000-5641.2021.04.006
  • Received Date: 2020-11-16
  • Publish Date: 2021-07-25
  • Understanding the impact of dissolved organic matter (DOM) on the denitrification process is critical to addressing the challenges associated with nitrogen removal in urban river treatment. In this paper, we show that DOM in urban rivers are mainly comprised of small-molecule fulvic acids. The humic acid content and aromaticity of the DOM, moreover, were found to be low. Compared with the control case, DOM can promote the denitrification process; specifically, the removal efficiency of TN and NO3-N in the DOM-added group increased by 7.24% ± 0.36% and 23.52% ± 1.17%, respectively. DOM with an acetate group had an even better effect on the removal of TN and NO3-N, reaching 74.48% ± 1.29% and 98.62% ± 0.07%, respectively. Microbiological analysis showed that the DOM-added group can significantly increase the diversity and richness of the bacteria community compared with the control case. However, the relative abundance of the heterotrophic denitrifiers Pseudomonas and Brevundimonas as well as the nirK-type denitrifier Paracoccus in the DOM-added group was less than that of the DOM with an acetate group. Additionally, a relatively high concentration of NH4+-N (> 3.7 mg/L) was observed in the DOM-added group. The addition of DOM can significantly increase the relative abundance of Anaeromyxobacter related to dissimilatory nitrate reduction to ammonium (DNRA) functional genes. It is speculated that DOM promotes the denitrification process and induces the DNRA process simultaneously.
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