Dosing free nitrous acid for sulfide control in sewers : Results of field trials in Australia

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

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  • Guangming Jiang
  • Anthony Keating
  • Shaun Corrie
  • Kelly O'halloran
  • Lam Nguyen


Original languageEnglish
Pages (from-to)4331-4339
Journal / PublicationWater Research
Issue number13
Publication statusPublished - 1 Sept 2013
Externally publishedYes


Intermittent dosing of free nitrous acid (FNA), with or without the simultaneous dosing of hydrogen peroxide, is a new strategy developed recently for the control of sulfide production in sewers. Six-month field trials have been carried out in a rising main sewer in Australia (150mm in diameter and 1080m in length) to evaluate the performance of the strategy that was previously demonstrated in laboratory studies. In each trial, FNA was dosed at a pumping station for a period of 8 or 24h, some with simultaneous hydrogen peroxide dosing. The sulfide control effectiveness was monitored by measuring, on-line, the dissolved sulfide concentration at a downstream location of the pipeline (828m from the pumping station) and the gaseous H2S concentration at the discharge manhole. Effective sulfide control was achieved in all nine consecutive trials, with sulfide production reduced by more than 80% in 10 days following each dose. Later trials achieved better control efficiency than the first few trials possibly due to the disrupting effects of FNA on sewer biofilms. This suggests that an initial strong dose (more chemical consumption) followed by maintenance dosing (less chemical consumption) could be a very cost-effective way to achieve consistent control efficiency. It was also found that heavy rainfall slowed the recovery of sulfide production after dosing, likely due to the dilution effects and reduced retention time. Overall, intermittent dose of FNA or FNA in combination with H2O2 was successfully demonstrated to be a cost-effective method for sulfide control in rising main sewers. © 2013 Elsevier Ltd.

Research Area(s)

  • Biofilm, Free nitrous acid, Hydrogen peroxide, Odour, Sewer, Sulfide

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Citation Format(s)

Dosing free nitrous acid for sulfide control in sewers: Results of field trials in Australia. / Jiang, Guangming; Keating, Anthony; Corrie, Shaun et al.
In: Water Research, Vol. 47, No. 13, 01.09.2013, p. 4331-4339.

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