Sulfur transformation in rising main sewers receiving nitrate dosage

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Guangming Jiang
  • Keshab Raj Sharma
  • Albert Guisasola
  • Jurg Keller
  • Zhiguo Yuan

Detail(s)

Original languageEnglish
Pages (from-to)4430-4440
Journal / PublicationWater Research
Volume43
Issue number17
Publication statusPublished - Sept 2009
Externally publishedYes

Abstract

The anoxic and anaerobic sulfur transformation pathways in a laboratory-scale sewer receiving nitrate were investigated. Four reactors in series were employed to imitate a rising main sewer. The nitrate-dosing strategy was effective in controlling sulfide, as confirmed by the long-term sulfide measurements. Anoxic sulfide oxidation occurred in two sequential steps, namely the oxidation of sulfide to elemental sulfur (S0) and the oxidation of S0 to sulfate (SO42-). The second oxidation step, which primarily occurred when the first step was completed, had a rate that is approximately 15% of the first step. When nitrate was depleted, sulfate and elemental sulfur were reduced simultaneously to sulfide. Sulfate reduction had a substantially higher rate (5 times) than S0 reduction. The relatively slower S0 oxidation and reduction rates implied that S0 was an important intermediate during anoxic and anaerobic sulfur transformation. Electron microscopic studies indicated the presence of elemental sulfur, which was at a significant level of 9.9 and 16.7 mg-S/g-biomass in nitrate-free and nitrate-exposed sewer biofilms, respectively. A conceptual sulfur transformation model was established to characterize predominant sulfur transformations in rising main sewers receiving nitrate dosage. The findings are pertinent for optimizing nitrate dosing to control sulfide in rising main sewers. © 2009 Elsevier Ltd. All rights reserved.

Research Area(s)

  • Elemental sulfur, Nitrate, Sewer, Sulfate, Sulfide, Sulfur transformation

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)

Sulfur transformation in rising main sewers receiving nitrate dosage. / Jiang, Guangming; Sharma, Keshab Raj; Guisasola, Albert et al.
In: Water Research, Vol. 43, No. 17, 09.2009, p. 4430-4440.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review