Controlling denitrification accompanied with nitrite accumulation at the sediment-water interface

Danyue Chen, Xuechu Chen, Xiaobo Huang, Shengbing He, Jungchen Huang, Weili Zhou

研究成果: Article同行評審

25 引文 斯高帕斯(Scopus)

摘要

Nitrate removal efficiencies of ecological treatment systems could be significantly improved by carbon addition, however, occasionally leading to the accumulation of nitrite. Simulation batch experiments were conducted to investigate effects of ethanol, as a carbon source, and temperature on denitrification at the sediment-water interface. At a C/N below 1.57, our results show nitrate removal rates were reduced as the nitrite accumulation reached a level of 7.8 mgL−1. Nitrate was removed with nitrite accumulations less than 20% at C/Ns of 1.57 and above at 20, 25 and 35 °C. According to the two-step zero-order kinetic model, both nitrate and nitrite reduction rates increased with C/Ns and temperature, but the former was greater than the latter throughout the experiment. The difference between two reduction rates led to nitrite accumulations, possibly due to electron competition and reductase activity. The feasibility of using a carbon source and increasing temperature was further confirmed in a mesocosm experiment, with a nitrate removal efficiency of 73.7% and a nitrite accumulation ratio of 0.8%. Our study suggests the addition of an external carbon source combined with a longer hydraulic retention time (HRT) would be an effective approach to achieve an ideal nitrate removal efficiency with low nitrite accumulation for an ecological treatment system.

原文English
頁(從 - 到)194-198
頁數5
期刊Ecological Engineering
100
DOIs
出版狀態Published - 2017 3月 1

All Science Journal Classification (ASJC) codes

  • 環境工程
  • 自然與景觀保護
  • 管理、監督、政策法律

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