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Wastewater-Enhanced Microbial Corrosion of Concrete Sewers

Journal Article


Abstract


  • Microbial corrosion of concrete in sewers is knownto be caused by hydrogen sulfide, although the role of wastewaterin regulating the corrosion processes is poorly understood.Flooding and splashing of wastewater in sewers periodicallyinoculates the concrete surface in sewer pipes. No study hassystematically investigated the impacts of wastewater inoculationon the corrosion of concrete in sewers. This study investigated thedevelopment of the microbial community, sulfide uptake activity,and the change of the concrete properties for coupons subjectedto periodic wastewater inoculation. The concrete coupons wereexposed to different levels of hydrogen sulfide under well-controlled conditions in laboratory-scale corrosion chamberssimulating real sewers. It was evident that the periodic inoculationinduced higher corrosion losses of the concrete in comparison tononinoculated coupons. Instantaneous measurements such as surface pH did not reflect the cumulative corrosion losses causedby long-term microbial activity. Analysis of the long-term profiles of the sulfide uptake rate using a Gompertz model supportedthe enhanced corrosion activity and greater corrosion loss. The enhanced corrosion rate was due to the higher sulfide uptakerates induced by wastewater inoculation, although the increasing trend of sulfide uptake rates was slower with wastewater.Increased diversity in the corrosion-layer microbial communities was detected when the corrosion rates were higher. Thiscoincided with the environmental conditions of increased levels of gaseous H2S and the concrete type

UOW Authors


  •   Jiang, Guangming
  •   Zhou, Mi (external author)
  •   Chiu, Tsz Ho. (external author)
  •   Sun, Xiaoyan (external author)
  •   Keller, Jurg (external author)
  •   Bond, Philip (external author)

Publication Date


  • 2016

Citation


  • Jiang, G., Zhou, M., Chiu, T. Ho., Sun, X., Keller, J. & Bond, P. L. (2016). Wastewater-Enhanced Microbial Corrosion of Concrete Sewers. Environmental Science and Technology, 50 (15), 8084-8092.

Scopus Eid


  • 2-s2.0-84980318039

Number Of Pages


  • 8

Start Page


  • 8084

End Page


  • 8092

Volume


  • 50

Issue


  • 15

Place Of Publication


  • United States

Abstract


  • Microbial corrosion of concrete in sewers is knownto be caused by hydrogen sulfide, although the role of wastewaterin regulating the corrosion processes is poorly understood.Flooding and splashing of wastewater in sewers periodicallyinoculates the concrete surface in sewer pipes. No study hassystematically investigated the impacts of wastewater inoculationon the corrosion of concrete in sewers. This study investigated thedevelopment of the microbial community, sulfide uptake activity,and the change of the concrete properties for coupons subjectedto periodic wastewater inoculation. The concrete coupons wereexposed to different levels of hydrogen sulfide under well-controlled conditions in laboratory-scale corrosion chamberssimulating real sewers. It was evident that the periodic inoculationinduced higher corrosion losses of the concrete in comparison tononinoculated coupons. Instantaneous measurements such as surface pH did not reflect the cumulative corrosion losses causedby long-term microbial activity. Analysis of the long-term profiles of the sulfide uptake rate using a Gompertz model supportedthe enhanced corrosion activity and greater corrosion loss. The enhanced corrosion rate was due to the higher sulfide uptakerates induced by wastewater inoculation, although the increasing trend of sulfide uptake rates was slower with wastewater.Increased diversity in the corrosion-layer microbial communities was detected when the corrosion rates were higher. Thiscoincided with the environmental conditions of increased levels of gaseous H2S and the concrete type

UOW Authors


  •   Jiang, Guangming
  •   Zhou, Mi (external author)
  •   Chiu, Tsz Ho. (external author)
  •   Sun, Xiaoyan (external author)
  •   Keller, Jurg (external author)
  •   Bond, Philip (external author)

Publication Date


  • 2016

Citation


  • Jiang, G., Zhou, M., Chiu, T. Ho., Sun, X., Keller, J. & Bond, P. L. (2016). Wastewater-Enhanced Microbial Corrosion of Concrete Sewers. Environmental Science and Technology, 50 (15), 8084-8092.

Scopus Eid


  • 2-s2.0-84980318039

Number Of Pages


  • 8

Start Page


  • 8084

End Page


  • 8092

Volume


  • 50

Issue


  • 15

Place Of Publication


  • United States