Question

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.

Answer 1

Crown corrosion of concrete wastewater distribution systems is caused by acidic fermentation products reacting with the gypsum in the concrete.

Step-by-step explanation:

Crown corrosion of concrete wastewater distribution systems is the result of acidic fermentation products reacting with the gypsum in the concrete. When wastewater with acidic fermentation products comes into contact with concrete, the acid reacts with the gypsum present in the concrete, leading to corrosion. This can weaken the structure of wastewater distribution systems over time.