ABSTRACT
The Murray Ohio Manufacturing Company (Murray), a wholly owned subsidiary of Tompkins, Inc., manufactures bicycles, mopeds, cycles, lawn mowers and garden tillers. The manufacturing facility, located in Lawrenceburg, Tennessee, discharges treated process wastewater to Shoal Creek. This discharge is regulated under an NPDES permit. In 1984-85, the wastewater treatment facilities were expanded to meet more stringent limitations based on water quality criteria presented in Table 1. Figure 1 presents a schematic of the multi-faceted treatment solution which was designed for the process waste streams. A portion of the expansion included the pretreatment of concentrated oil and grease waste streams from several alkaline surfactant cleaner “soaks” used in plating and cleaning lines. Spent cleaner tanks are discharged (dumped) to treatment when they can no longer satisfactorily clean parts. The entire tank is usually discharged to waste treatment when spent (4,000- to 10,000-gallon dumps). The spent dumps are pretreated in batch tanks prior to subsequent treatment. This chapter deals with the treatment of these alkaline-soak cleaning solutions.
