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Radionulides and PCBs in WaterNuclear Power Plant Radioactive Liquid Waste with PCBsBackground The nuclear power industry is currently searching for effective solutions for removing oil, PCBs and radionuclides from radioactive liquid waste. Duratek Corp. (Columbia, S.C.) processes radioactive liquid waste for a U.S. nuclear power plant. At this facility, the liquid waste treatment process basically consists of beds loaded with activated carbon and various ion exchange resins, preceded by particle filtration for suspended solids. The Problem The challenge here is to remove all traces of oil, PCBs and radioactivity, and to polish the water to Grade A purity for discharge and/or reuse within the plant. Meeting discharge limits for PCBs in this case requires levels below 65 ppt (parts per trillion). Carbon and ion exchange polishing systems are simply not effective at meeting these extremely low levels with such a complex liquid waste. As well, oily compounds in liquid waste cause carbon and ion exchange beds to load rapidly, plug-up and break-through much quicker than normal (which cripples efficiency and generates large volumes of hazardous waste). The Solution In January 2003, HRM cartridges were evaluated for their ability to remove oil, PCBs and radionuclides to below detectable limits. After successful testing, the nuclear power company ordered a full-scale system from JoDAN Technologies of Glen Mills, Pa. (consisting of five micron particle filtration and HRM Cartridge units) to remove the all the oil and PCBs (down below 65 ppt), and knockdown radionuclides from the radioactive liquid waste at 60 gallons per minute. After HRM pre-treatment, the carbon and ion exchange beds can then be used for only trace components, and in turn will last several times longer. This combination of technologies provides a consistent water polishing to ultra-pure standards without clogging, plugging up, and channeling while reducing hazardous waste up to 100 times. |