Determining the long-term effects of H2S concentration, relative humidity and air temperature on concrete sewer corrosion

Jiang, Guangming, Keller, Jurg and Bond, Philip L. (2014) Determining the long-term effects of H2S concentration, relative humidity and air temperature on concrete sewer corrosion. Water Research, 65 157-169. doi:10.1016/j.watres.2014.07.026

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Author Jiang, Guangming
Keller, Jurg
Bond, Philip L.
Title Determining the long-term effects of H2S concentration, relative humidity and air temperature on concrete sewer corrosion
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2014-11-15
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.watres.2014.07.026
Open Access Status
Volume 65
Start page 157
End page 169
Total pages 13
Place of publication Oxford, United Kingdom
Publisher Elsevier Ltd
Collection year 2015
Language eng
Subject 2312 Water Science and Technology
2311 Waste Management and Disposal
2310 Pollution
2302 Ecological Modelling
Abstract Many studies of sewer corrosion are performed in accelerated conditions that are not representing the actual corrosion processes. This study investigated the effects of various factors over 3.5 years under controlled conditions simulating the sewer environment. Concrete coupons prepared from precorroded sewers were exposed, both in the gas phase and partially submerged in wastewater, in laboratory controlled corrosion chambers. Over the 45 month exposure period, three environmental factors of H2S concentration, relative humidity and air temperature were controlled at different levels in the corrosion chambers. A total of 36 exposure conditions were investigated to determine the long term effects of these factors by regular retrieval of concrete coupons for detailed analysis of surface pH, corrosion layer sulfate levels and concrete loss. Corrosion rates were also determined for different exposure periods. It was found that the corrosion rate of both gas-phase and partially-submerged coupons was positively correlated with the H2S concentration in the gas phase. Relative humidity played also a role for the corrosion activity of the gas-phase coupons. However, the partially-submerged coupons were not affected by humidity as the surfaces of these coupons were saturated due to capillary suction of sewage on the coupon surface. The effect of temperature on corrosion activity varied and possibly the acclimation of corrosion-inducing microbes to temperature mitigated effects of that factor. It was apparent that biological sulfide oxidation was not the limiting step of the overall corrosion process. These findings provide real insights into the long-term effects of these key environmental factors on the sewer corrosion processes.
Keyword Concrete
Corrosion
Humidity
Hydrogen sulfide
Sewer
Temperature
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Advanced Water Management Centre Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 13 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 14 times in Scopus Article | Citations
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