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REMOVAL OF PERFLUORINATED COMPOUNDS FROM POST-EMERGENCY WASTEWATER BY ADVANCED OXIDATION PROCESS AND GRANULAR ACTIVATED CARBON ADSORPTION
Dyson, Sean M., Master's thesis, Air Force Institute of Technology, Wright-Patterson AFB, OH. AFIT-ENV-MS-18-M-197, 129 pp, 2018

In a novel approach for removing per- and polyfluoroalkyl substances (PFAS) from wastewater with high (~100 mg/L) total organic carbon (TOC) concentrations, a UV/H2O2 advanced oxidation process (AOP) was followed by filtration using Calgon Filtrasorb® 600 (F600) granular activated carbon (GAC). The UV/H2O2 AOP experiments were conducted to determine whether TOC concentrations could be reduced as a pretreatment step before filtering the water with F600-GAC. At a 250 mg/L H2O2 concentration and 8-hr operation of the UV/H2O2 AOP system, TOC was reduced in solution by >98%. Rapid small-scale column tests were used to determine whether pretreatment with AOP affected GAC adsorption capacity for PFAS, specifically PFOS and PFOA. The AOP pretreatment process increased GAC capacity through 10% breakthrough (BV10) for PFOS by 1800% (increasing the adsorbent's solid-phase concentration from 3 mg-PFOS/g-GAC without pre-treatment up to >52 mg-PFOS/g-GAC with pretreatment). The pretreatment process also improved GAC capacity through BV10 for PFOA by 1100% (1.1 mg-PFOA/g-GAC up from 0.1 mg-PFOA/g-GAC) when operating the AOP for 8 hr versus 2 hr. http://www.dtic.mil/dtic/tr/fulltext/u2/1056482.pdf



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