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JUL-02-99 15:24 From:URS GREINER SF 4153981904 T-834 P 03/07 Job-853 <br /> oxidation with Fenton's reagent peroxide and ferrous iron,referred Fore 3:RepressnWive Ilet of <br /> widely used in ex-situ and to as Fenton's reagent,was later common environmental <br /> wastewater treatment of recalcitrant identified as a free hydroxyl radical P01111tents Oxidized by Fenton's <br /> organic contaminants,including (OH*)formed by the reaction: reagent,based on laboratory and <br /> chlorinated solvents and polycyclic HZOp+Fe+z—�Fe+3+OHa+OH- field studies <br /> aromatic hydrocarbon.Recent The OH'generated by Fentows <br /> lrtimd i oadvances in development of reagent is a powerful,non-selective <br /> chemical oxidation include oxidant,second only to fluorine in •BTIX IPaiturro,tpiilene,e <br /> technologies to deliver and oxidizing power.Oxidation of an xl4enas), <br /> distribute reagents in soil and organic compound by Fenton's ' e'(sini voletge orpenk tinpt <br /> groundwater for in-situ remediation reagent is rapid and exothermic, sudt o mphtteMne,anthracene, <br /> of chlorinated solvents,at Rate constants for reactions for phanarOnne,pyrtMia) <br /> contaminant concentrations ranging OH•with common environmental 'Oftr petroleum hydrocarhoos <br /> from the ppb level to free-phase pollutants are typically in the range 'Nitroaromatio munilons,such as <br /> DNAPL. of 107 to 1010 M-Is-1,and 100 trinitrotoluam MM and dirikowiuene <br /> !� BpknpI percent mineralization is generally (dam <br /> Feawn 9 ECAC phmer complete in minutes.Fenton's Phenolic compounds <br /> H.J.H Fenton first reported in 1894 reagent has been widely used for .pggs(polychlorinated Dlpherryls) ~— <br /> that malic acid was rapidly oxidised ex-situ chemical oxidation of •PCEISHertiides and pesflcides(prryls) thatin, <br /> by hydrogen peroxide in the common wastewater and chlordane,lindane,OcIdeseldane, <br /> presence of ferrous Iron.The environmental pollutants,but in- panWhklrophenol,ehlorophenoxyls) <br /> oxidation mechanism resulting situ application technologies have <br /> from solutions of hydrogen only recently become available.See Chlorinated solvents <br /> figure 1,page 7. -Alkenes,such as trkhloroethene, <br /> J.Daniel Bryant,Ph.D.,Is a son br A possible concern in choosing in- perchloroatham;dlchloroathene <br /> gaologlot and James T. Wilson Is situ treatment alternatives is •Alkanes,such as trichloroethane, <br /> pfss/Oant or Gap-Clsansa Continues on -+ <br /> Internatfonst Inc.,Kenilworth,N.J. page 6 dichloroethane <br /> !s <br /> ' 1 <br /> man if <br /> 1 <br /> fORDFIAIISANDINIFORMATION <br /> No FLEA COLLARS OR VACCINES REQUIRED! a <br /> t , t t <br /> Wfft in 070 <br /> Soil&Groundwoter Cleanup August/September 1998 7 <br />