Assessment of pH shock as a method for controlling sulfide and methane formation in pressure main sewer systems

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

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Author(s)

  • Oriol Gutierrez
  • Gatut Sudarjanto
  • Guo Ren
  • Ramon Ganigué
  • Guangming Jiang

Detail(s)

Original languageEnglish
Pages (from-to)569-578
Journal / PublicationWater Research
Volume48
Issue number1
Publication statusPublished - 1 Jan 2014
Externally publishedYes

Abstract

Caustic dosing to raise pH above 10.0 for short periods (hours) is often used by water utilities for controlling sulfide formation in sewers. However the effectiveness of this strategy is rarely reported and the impact of pH level and exposure time on the effectiveness is largely unknown. The effectiveness of this strategy under various pH levels (10.5-12.5) and exposure time (0.5-6.0h) in controlling sulfide and methane production was evaluated in laboratory scale anaerobic sewer reactors and then in a real sewer system. Laboratory studies showed that the sulfide production rate of the laboratory sewer biofilm was reduced by 70-90% upon the completion of the pH shock, while the methane production rate decreased by 95-100%. It took approximately one week for the sulfate-reducing activity to recover to normal levels. In comparison, the methanogenic activities recovered to only about 10% in 4 weeks. The slow recovery is explained by the substantially loss of cell viability upon pH shocks, which recovered slowly after the shocks. Laboratory studies further revealed that a pH level of 10.5 for 1-2h represent cost-effective conditions for the pH shock treatment. However, field trials showed a higher pH (11.5) and larger dosing times are needed due to the pH decreases along the sewer line and at the two ends of the caustic-receiving wastewater slugs due to dilution. To have effective sulfide and methane control, it is important to ensure effective conditions (pH>10.5 and duration >1-2h) for the entire sewer line. © 2013 Elsevier Ltd.

Research Area(s)

  • Caustic, Methane, Methanogens, PH shock, Sewer, Sulfate, Sulfate-reducing bacteria, Sulfide, Wastewater

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)

Assessment of pH shock as a method for controlling sulfide and methane formation in pressure main sewer systems. / Gutierrez, Oriol; Sudarjanto, Gatut; Ren, Guo et al.
In: Water Research, Vol. 48, No. 1, 01.01.2014, p. 569-578.

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