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, Jürg; Yuan, Zhiguo

doi:10.1016/j.watres.2014.12.020

Cited by 59 publications

(36 citation statements)

References 34 publications

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“…To mitigate the generation and partition of H 2 S, liquid and gas-phase technologies using chemicals such as nitrates or iron salts are applied (Jiang et al, 2015a). Free nitrous acid (FNA), is an antimicrobial agent at ppm level, and is applied to limit the activity of SRB in the liquid phase of the sewer (Jiang et al, 2013) and has also been applied to directly inhibit the activity of ASOM in corrosion layers (Sun et al, 2015). Other technologies include the manufacture of corrosion-resistant concrete through the addition of admixtures, alternative binders or aggregates for new sewers.…”

Section: Summary and Future Directionsmentioning

confidence: 99%

The Ecology of Acidophilic Microorganisms in the Corroding Concrete Sewer Environment

et al. 2017

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Concrete corrosion is one of the most significant problems affecting valuable sewer infrastructure on a global scale. This problem occurs in the aerobic zone of the sewer, where a layer of surface corrosion develops on the exposed concrete and the surface pH is typically lowered from around 11–10 (pristine concrete) to pH 2–4. Acidophilic microorganisms become established as biofilms within the concrete corrosion layer and enhance the loss of concrete mass. Until recently, the acidophilic community was considered to comprise relatively few species of microorganisms, however, the biodiversity of the corrosion community is now recognized as being extensive and varying from different sewer environmental conditions. The diversity of acidophiles in the corrosion communities includes chemolithoautotrophs, chemolithoheterotrophs, and chemoorganoheterotrophs. The activity of these microorganisms is strongly affected by H2S levels in the sewer gas phase, although CO2, organic matter, and iron in the corrosion layer influence this acidic ecosystem. This paper briefly presents the conditions within the sewer that lead to the development of concrete corrosion in that environment. The review focuses on the acidophilic microorganisms detected in sewer corrosion environments, and then summarizes their proposed functions and physiology, especially in relation to the corrosion process. To our knowledge, this is the first review of acidophilic corrosion microbial communities, in which, the ecology and the environmental conditions (when available) are considered. Ecological studies of sewer corrosion are limited, however, where possible, we summarize the important metabolic functions of the different acidophilic species detected in sewer concrete corrosion layers. It is evident that microbial functions in the acidic sewer corrosion environment can be linked to those occurring in the analogous acidic environments of acid mine drainage and bioleaching.

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Section: Summary and Future Directionsmentioning

confidence: 99%

The Ecology of Acidophilic Microorganisms in the Corroding Concrete Sewer Environment

et al. 2017

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“…During active sewer corrosion sulphur oxidizing bacteria (SOB) oxidize the sulphur compounds resulting in sulphuric acid production which then diffuses into the inner corrosion layer and reacts with alkaline compounds released from the material. Ultimately, the loss of cement mass occurs and the microbial conversions of sulphur compounds are critical for the process [5].…”

Section: Introductionmentioning

confidence: 99%

Determination of durability of mortar with slag exposed to bacterial environment

Smolakova

Estokova

Václavík

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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View the article online for updates and enhancements. Related contentChanges in water absorptivity of slag based cement mortars exposed to sulphuroxidising A. thiooxidans bacteria A Estokova, M Smolakova, A Luptakova et al. Abstract. Leaching of cement based materials and dissolution of cement hydrates under biogenic acid attack result in an increase of the porosity and changes in the pore structure of the building materials. The impact of certain physicochemical concrete/mortar parameters such as cement chemistry, water/binder (w/b) ratio, porosity and fluid permeability of cementitious materials has been recognized from a material sciences perspective. In this work the durability of cement composite made with blast furnace slag exposed to sulphur oxidizing bacteria A. thiooxidans during the period of 12 months was investigated. Leaching of calcium and silicon ions, water absorbability and porosity of the slag based composite using X-ray computed tomography was evaluated.

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“…Similarly, our previous study performed on intact corrosion layer found that about 10 -20% of sulfide oxidizing activity (mainly chemical) remained after inactivating bacteria in corrosion product (Sun et al, 2015c (Vazquez et al, 1989). Therefore, chemical oxidation of sulfide may play a critical role in accelerating sulfide induced concrete corrosion at heavily corroded conditions, which has not been previously reported.…”

Section: Detection Of Chemical Sulfide Oxidation In the Corrosion Promentioning

confidence: 69%

“…It should be noted that microbes plays an important role in the H 2 S uptake activity and deactivating the microbes can significantly decrease the SUR (Sun et al, 2015c). The probable inhibition of SOB by high sulfide loads has also been reported in sewer concrete corrosion layers that were periodically exposed to 1000 ppm v of H 2 S and loadings of up to 340 mg-S m -2 h -1 (Nielsen et al, 2014).…”

Section: ((Mg-s) See Details Of Calculation In Equation S6-4 In Si)mentioning

confidence: 79%

“…These technologies mitigate the corrosion through either preventing the build up of sulfide in the liquid phase or by preventing the concrete surface from H 2 S attack (Ganigue et al, 2011;Pikaar et al, 2014;Sun et al, 2015c;Sydney et al, 1996). In particular, one treatment is to directly remove the corrosion layer by washing the concrete surface.…”

Section: Introductionmentioning

confidence: 99%

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Improving the understanding of concrete sewer corrosion through investigations of the gaseous hydrogen sulfide uptake and transformation processes in the corrosion layer

Sun¹

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Sulfide-induced corrosion of sewer infrastructure costs multi-billion dollars globally. Sewer maintenance and management largely depends on the estimation of the sewer corrosion rate, which currently can be very rough due to poor understanding of details of the process. Hence improved understanding of the corrosion processes has a major beneficial impact globally through increased service life and reduced repair/replacement costs. The overall aim of this thesis is to improve the understanding of sewer corrosion processes and develop strategies for corrosion control.To rapidly and non-destructively monitor the corrosion process, a methodology was developed based on measuring the H 2 S (sulfide) uptake rates (SUR) of concrete. The SUR of concrete coupons was determined by monitoring the temporal gaseous H 2 S concentrations in a temperature-and humidity-controlled gas-tight reactor. The results from repeated tests showed good reliability of the method. A severely corroded coupon exhibited higher SUR than a less corroded coupon, suggesting that the former having a higher sulfide oxidation activity than the latter. Additionally, temperature changes had a stronger effect on the SUR of the heavily corroded coupon compared to the less corroded coupon. The corrosion rates estimated from the SUR agreed well with those observed in real sewers under similar conditions. The effect high H 2 S concentrations on the SUR of coupon were investigated. During the high load situation, the SUR increased significantly but then decreased (compared to the baseline SUR) by about 7 -14% and 41 -50% immediately after short-and long-term high H 2 S load periods, respectively. For both conditions, the SUR gradually (over several hours) recovered to approximately 90% of the baseline SUR. Further tests suggest multiple factors may contribute to the observed decrease of SUR directly after the high H 2 S load. This includes the temporary storage of elemental sulfur in the corrosion layer and inhibition of sulfide oxidizing bacteria due to high H 2 S level and temporary acid surge. The sensitivity of the coupon SUR towards high H 2 S loads was largely dependent on its historical H 2 S exposure levels. IIThe deprivation of gaseous H 2 S for 1 h consistently caused temporary increase of the H 2 S uptake rate (SUR) immediately upon H 2 S re-supply whereas deprivation of both gaseous H 2 S and O 2 for 1 h posed little increase of the SUR after re-supply. The results suggest that the H 2 S uptake process could be limited by the oxidation of reduced sulfur species. Furthermore, the SUR decreased by 1.2% after deprivation of H 2 S for a relative long-term (i.e. 12 h), suggesting a reduced biological activity after the extended "starvation".The details of sulfide oxidation by comparing oxidation activity of a suspended solution of a corrosion layer with gaseous H 2 S uptake activity of a coupon were investigated. With sufficient dissolved oxygen (DO) and in the presence of sulfide, the mole ratio of consumed The potential of mitigating sewer cor...

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

Cited by 59 publications

References 34 publications

The Ecology of Acidophilic Microorganisms in the Corroding Concrete Sewer Environment

The Ecology of Acidophilic Microorganisms in the Corroding Concrete Sewer Environment

Determination of durability of mortar with slag exposed to bacterial environment

Improving the understanding of concrete sewer corrosion through investigations of the gaseous hydrogen sulfide uptake and transformation processes in the corrosion layer

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