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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yiwen Liu
  • Keshab R. Sharma
  • Bing-Jie Ni
  • Lu Fan
  • Sudhir Murthy
  • Gene Q. Tyson

Detail(s)

Original languageEnglish
Pages (from-to)155-165
Journal / PublicationWater Research
Volume74
Publication statusPublished - 1 May 2015
Externally publishedYes

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 nitrate exposure was completely suppressed, and consequently, the methane production zone re-established deeper in the sediment where nitrate penetration was infrequent. © 2015 Elsevier Ltd.

Research Area(s)

  • Methane, Micro-scale profiling, Nitrate, Sewer sediment, Sulfide

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Effects of nitrate dosing on sulfidogenic and methanogenic activities in sewer sediment. / Liu, Yiwen; Sharma, Keshab R.; Ni, Bing-Jie et al.
In: Water Research, Vol. 74, 01.05.2015, p. 155-165.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review