Effects of nitrate dosing on sulfidogenic and methanogenic activities in sewer sediment

Water Research
Yiwen LiuZhiguo Yuan

Abstract

Nitrate dosing is widely used to control sulfide and methane formation in sewers. The impact of nitrate on sulfide and methane production by sewer biofilms in rising mains has been elucidated recently. However, little is known about the effect of nitrate on biologically active sewer sediment, which is substantially thicker than rising main biofilms (centimeters vs. hundreds of micrometers, respectively). In this study, we investigated the effect of nitrate addition to sewer sediment cultivated in lab-scale sewer sediment reactors. Batch test results showed that nitrate addition does not suppress sulfide production in sewer sediment, but it reduces sulfide accumulation through anoxic sulfide oxidation in the sediment and hence, also reduces sulfide accumulation in the bulk water. Microsensor measurement of sediment sulfide revealed the presence of sulfide oxidation and sulfide production zones with the interface dynamically regulated by the depth of nitrate penetration. In contrast, the methane production activity of sewer sediment was substantially reduced, likely due to the long-term inhibitory effects of nitrate on methanogens. Pore water measurements showed that methane production activity in the sediment zone with frequent ...Continue Reading

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Citations

Apr 19, 2015·The Science of the Total Environment·Yiwen LiuZhiguo Yuan
Jul 15, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Ziyang ZhangHaiyan Li
Jul 8, 2020·Environment International·Xuan ShiPengkang Jin
Jun 15, 2019·Water Research·John J WeatherillMichael O Rivett
Sep 22, 2020·Environmental Science & Technology·Jiaying LiGuangming Jiang
Dec 11, 2021·The Science of the Total Environment·Zhiqiang ZhangCailin Zheng

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