Crown corrosion of concrete wastewater distribution systems is the result of
A) acidic fermentation products reacting with the gypsum in the concrete.
B) sulfate reduction in the sewage and sulfide oxidation in the oxic headspace above.
C) fungal growth in the concrete.
D) rapid iron reduction coupled to pyrite dissolution.

Question

Quizplus · Accepted Answer

Crown corrosion of concrete wastewater distribution systems is caused by sulfate reduction in the sewage and sulfide oxidation in the oxic headspace above. The sulfide produced by sulfate reducing bacteria reacts with the air above the wastewater, forming sulfuric acid, which corrodes the concrete.

Crown Corrosion of Concrete Wastewater Distribution Systems Is the Result