Abstract
AbstractStoichiometry of hydrogen sulfide–induced corrosion of concrete sewers was quantified in a bench-scale experimental setup consisting of six concrete pipe reactors. The setup was installed in an underground sewer research and monitoring station with access to fresh municipal wastewater. Hydrogen sulfide gas was injected intermittently into the headspace of the pipe reactors in peak concentrations of approximately 1,000 ppmv. Mass balance calculations on total injected amounts of hydrogen sulfide gas and observed corrosion depths demonstrated that only a fraction of the hydrogen sulfide gas caused corrosion. The stoichiometry of the corrosion process was found to depend on both duration and level of hydrogen sulfide exposure. The highest fraction of sulfide-causing corrosion was found after extended exposure and low injection frequencies. When sulfide exposure was terminated, a significant potential for sustained corrosion was observed. This was most likely the result of sulfuric acid production fr...
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