The 4-foot-thick floating grease blanket in Castroville Pump Station was a continuous challenge for Monterey One Water mechanics in Marina, California.
The cost to remove the grease was prohibitive, and the blanket’s depth reduced valuable capacity. Hydrogen sulfide at 35 ppm degraded the wet well coating and eroded concrete and metal.
“Mechanical seals on the sewage pumps made it difficult to pump down and remove the grease,” says Bret Boatman, field maintenance supervisor. “Even if we could pump down without damaging the pumps, we’d have to do it multiple times per week.”
Castroville’s FOG program and the vendor’s grease removal products
