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EMERGING TECHNOLOGY SUMMARY: DEMONSTRATION OF AMBERSORB 563 ADSORBENT TECHNOLOGY
Roy F. Weston, I. EMERGING TECHNOLOGY SUMMARY: DEMONSTRATION OF AMBERSORB 563 ADSORBENT TECHNOLOGY. EPA/540/SR-95/516, 1995.
A field pilot study was conducted to demonstrate the technical feasibility and cost-effectiveness of Ambersorb® 5631 carbonaceous adsorbent for remediating groundwater contaminated with volatile organic compounds (VOCs). The Ambersorb adsorbent technology demonstration consisted of four service cycles, three steam regenerations, and one superloading. The study was conducted using a 1-gallon-per minute (gpm) continuous pilot system that consisted of two adsorbent columns configured to operate in parallel or in series. During the first service cycle, the columns were operated in parallel for direct comparison of the performance of virgin Ambersorb 563 adsorbent with that of virgin Filtrasorb® 4001 granular activated carbon (GAC). While operating at five times the flow rate loading, Ambersorb 563 adsorbent was able to treat approximately two to five times the bed volumes (BVs) of water as did Filtrasorb 400 GAC before VOC breakthrough at the maximum contaminant level (MCL) was observed. For the remaining cycles, two Ambersorb 563 adsorbent columns were operated in series to investigate the effect of multiple service cycles and steam regeneration on Ambersorb adsorbent performance. After each service cycle, steam regeneration of the Ambersorb adsorbent column was performed on-site. The regeneration process yielded a condensate consisting of a separable concentrated organic layer and a VOC-saturated aqueous phase. In addition, the principle of superloading was demonstrated by passing the aqueous phase from the third steam regeneration through an Ambersorb adsorbent superloading column.
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