Improved sulfide mitigation in sewers through on-line control of ferrous salt dosing

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

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Author(s)

  • Ramon Ganigué
  • Guangming Jiang
  • Yiqi Liu
  • Keshab Sharma
  • Yue-Cong Wang
  • José Gonzalez
  • Tung Nguyen

Detail(s)

Original languageEnglish
Pages (from-to)302-310
Journal / PublicationWater Research
Volume135
Publication statusPublished - 15 May 2018
Externally publishedYes

Abstract

Water utilities worldwide spend annually billions of dollars to control sulfide-induced corrosion in sewers. Iron salts chemically oxidize and/or precipitate dissolved sulfide in sewage and are especially used in medium- and large-size sewers. Iron salt dosing rates are defined ad hoc, ignoring variation in sewage flows and sulfide levels. This often results in iron overdosing or poor sulfide control. Online dosing control can adjust the chemical dosing rates to current (and future) state of the sewer system, allowing high-precision, stable and cost-effective sulfide control. In this paper, we report a novel and robust online control strategy for the dosing of ferrous salt in sewers. The control considers the fluctuation of sewage flow, pH, sulfide levels and also the perturbation from rainfall. Sulfide production in the pipe is predicted using auto–regressive models (AR) based on current flow measurements, which in turn can be used to determine the dose of ferrous salt required for cost-effective sulfide control. Following comprehensive model-based assesment, the control was successfully validated and its effectiveness demonstrated in a 3-week field trial. The online control algorithm controlled sulfide below the target level (0.5 mg S/L) while reducing chemical dosing up to 30%. © 2018 Elsevier Ltd

Research Area(s)

  • Chemical dosing, Corrosion, Online control, Sewer systems, Sulfide control

Bibliographic Note

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Citation Format(s)

Improved sulfide mitigation in sewers through on-line control of ferrous salt dosing. / Ganigué, Ramon; Jiang, Guangming; Liu, Yiqi et al.
In: Water Research, Vol. 135, 15.05.2018, p. 302-310.

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