Battling the enemy

Crews at the Central Costa Sanitary District Wastewater Treatment Plant install deep-well anodes for a cathodic protection system designed to protect the secondary-treated-effluent welded steel pipe (shown with a white coating at the rear of the photo). The deep well was drilled to a depth of 320 feet and was about 12 inches in diameter. Photos: V&A Consulting Engineers Inc.

Left: Welders connect paired cathodic protection wires to below-grade wastewater pipes. Only a small fraction of U.S. wastewater systems are currently provided with cathodic protection. Right: Polyvinyl chloride sheeting—shown here in interior-wall form—will protect the new pump station from sulfide-induced corrosion.

Atmospheric conditions caused corrosion on this flexible coupling.

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