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Updated: Jan 13, 2026

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
Published on: December 6, 2018
Denitrification driven by varying concentrations of Mn (II) under no external carbon source conditions:
Lingyun Mu1, Xiaoxiao Hou1, Xinshan Song2
1College of Environmental Science and Engineering, Donghua University, 201620 Shanghai, China.
Abstract:
Manganese-driven denitrification has the potential to effectively remove nitrogen while reducing the demand for additional carbon sources. Under no external carbon source conditions, the effects of Mn2+ concentration and hydraulic retention time (HRT) on manganese-driven denitrification, and optimal reaction conditions remain unclear. Therefore, this study constructed six denitrification filters, using different HRTs and a series of Mn2+ concentration gradients. The results indicated that Mn-5 (5 mg/L Mn2+) performed optimally (HRT = 24 h), with the average removal efficiencies of nitrate nitrogen (NO3--N) and total nitrogen (TN) increased by 27 % and 21 %, respectively. Microorganisms associated with manganese-driven denitrification are enriched in the filters. Notably, in the Mn-5 filter, the abundance of key functional genes associated with manganese transport system, nitrogen conversion and removal, and carbon metabolism increased significantly, thereby enhancing nitrogen removal. In summary, this study provides a novel approach to denitrification, supporting future research.
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