Which of the following methods is NOT utilized for corrosion protection in wastewater treatment plants?

Cement without lining is not a method utilized for corrosion protection in wastewater treatment plants because while cement can be used as a construction material, it inherently lacks the properties needed to prevent corrosion. In environments where wastewater is present, factors like pH, the presence of sulfides, and moisture can all accelerate the deterioration of concrete.

In contrast, coatings and linings are specifically designed to provide a protective barrier that prevents corrosive substances from coming into direct contact with the underlying material, effectively extending the lifespan of infrastructure. Galvanic anodes are used to protect metal structures by sacrificing themselves to corrosion, providing a continuous protective mechanism. Corrosion inhibitors are chemical agents that can be added to the wastewater or to the materials to reduce the rate of corrosion. Each of these methods is actively employed to mitigate the effects of corrosion in wastewater treatment facilities, enhancing the durability and reliability of the systems.