ABSTRACT
This paper describes the actions taken by Caterpillar’s gray iron foundry, located at Mapleton, Illinois, to comply with stringent discharge regulations imposed by United States Environmental Protection Agency (USEPA) on the Metal Molding and Casting Industry. The Mapleton foundry’s only categorically regulated wastewater stream is from wet dust collection scrubbers. The process envisioned by the USEPA was recirculation of water to the scrubbers, with a 3% blowdown to control dissolved solids build-up.
