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Today, the subject of recycling used antifreeze/coolant is a popular and very complex issue. Legislation has forced users in some areas of the United States to either recycle or to pay for proper disposal through a licensed facility. Recycling represents a viable alternative to disposal but poses technical challenges never before attempted. This paper describes a unique, multi-stage purification process (MSPP) based on dual-bed deionization. The process can be effectively utilized in automotive or heavy-duty applications to remove inhibitors and contaminants in both ionic and particulate form. This paper presents (1) analysis of several used coolants before and after the process, (2) comparison of other recycling processes, (3) hazardous waste characterization testing of process components and finished product, and (4) complete corrosion/performance testing of the finished coolant.
ion, ion-exchange, total dissolved solids, glycolate, formate, recycling, multistage, purification process
Laboratory manager, BG Products, Inc., Wichita, KS