IFM has assisted a Northwest Ohio stamping facility for several years with the management of its wastewater treatment system. The facility's wastewater treatment consists of a four celled lagoon system operated in series. This lagoon system is operated as a controlled discharge lagoon system. Influent characteristics are high BOD, TSS, FOG and TPH due to the industrial byproducts from its manufacturing processes.
Recently, the primary lagoon was cleaned of residual oily sludge buildup. This oily sludge was dewatered, mixed with lime and hauled to the local landfill for disposal. This event and the increasing efforts to maintain NPDES Permit compliance encouraged the manufacturer to look at waste reduction methods and improved fluid management.
Review of the facility's wastewater generation led to the idea of revisiting membrane technology for oil and grease reduction to the lagoon system. IFM designed a portable treatment skid and pilot protocol to determine BOD, oil and grease and TPH loadings from the various constituents pumped to the lagoon.
From the pilot test and analytical data, it was determined that ultrafiltration (UF) could be used to reduce loadings on the lagoon system while also reducing the cost for chemicals and current disposal of waste oils. From the trial, IFM concluded that permeate from a properly designed system could be reused for cleaner rinse from the burnisher, thus reducing chemical costs. UF could also be used to â€œdewaterâ€ waste emulsified oils prior to disposal.