A novel and simple treatment for control of sulfide induced sewer concrete corrosion using free nitrous acid

Sun, Xiaoyan, Jiang, Guangming, Bond, Philip L., Keller, Jurg and Yuan, Zhiguo (2015) A novel and simple treatment for control of sulfide induced sewer concrete corrosion using free nitrous acid. Water Research, 70 279-287. doi:10.1016/j.watres.2014.12.020

Author Sun, Xiaoyan
Jiang, Guangming
Bond, Philip L.
Keller, Jurg
Yuan, Zhiguo
Title A novel and simple treatment for control of sulfide induced sewer concrete corrosion using free nitrous acid
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
Publication date 2015-03-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.watres.2014.12.020
Open Access Status
Volume 70
Start page 279
End page 287
Total pages 9
Place of publication London, United Kingdom
Publisher I W A Publishing
Collection year 2016
Language eng
Formatted abstract
Improved technologies are currently required for mitigating microbially induced concrete corrosion caused by the oxidation of sulfide to sulfuric acid in sewer systems. This study presents a novel strategy for reducing H2S oxidation on concrete surfaces that accommodate an active corrosion biofilm. The strategy aims to reduce biological oxidation of sulfide through treating the corrosion biofilm with free nitrous acid (FNA, i.e. HNO2). Two concrete coupons with active corrosion activity and surface pH of 3.8 ± 0.3 and 2.7 ± 0.2 were sprayed with nitrite. For both coupons, the H2S uptake rates were reduced by 84%–92% 15 days after the nitrite spray. No obvious recovery of the H2S uptake rate was observed during the entire experimental period (up to 12 months after the spray), indicating the long-term effectiveness of the FNA treatment in controlling the activity of the corrosion-causing biofilms. Live/Dead staining tests on the microorganisms on the concrete coupon surfaces demonstrated that viable bacterial cells decreased by > 80% 39 h after the nitrite spray, suggesting that biofilm cells were killed by the treatment. Examination of a corrosion layer within a suspended solution, containing the corrosion-causing biofilms, indicated that biological activity (ATP level and ratio of viable bacterial cells) was severely decreased by the treatment, confirming the bactericidal effect of FNA on the microorganisms in the biofilms. While field trials are still required to verify its effectiveness, it has been demonstrated here that the FNA spray is potentially a very cheap and effective strategy to reduce sewer corrosion.
Keyword Sewer
Hydrogen sulfide
Free nitrous acid
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 17 December 2014

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 1 times in Thomson Reuters Web of Science Article | Citations
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Created: Tue, 06 Jan 2015, 14:23:48 EST by Xiaoyan Sun on behalf of Advanced Water Management Centre