||Electrochemical Activation and Regeneration of Carbon Surfaces for Tertiary Water Treatment.
Will, George B. ;
||Virginia Polytechnic Inst. State Univ., Blacksburg. Dept. of Chemical Engineering.
||DI-14-31-0001-3247; OWRR-A-032-VA; 12324,; A-032-VA(1)
( Activated carbon treatment ;
( Sewage treatment ;
Activated carbon treatment) ;
( Chemical removal(Sewage treatment) ;
( Water pollution ;
Surface chemistry ;
Chlorine organic compounds ;
Tertiary sewage treatment
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Electrochemical activation of wetted carbon surfaces was accomplished by anodic oxidation of 20% hydrochloric acid to evolve chlorine at the surface to be activated. Current densities in the range of 0 to 125 milliamps per square centimeter were employed and increases in apparent absorptivity as determined by polarization currents were as high as factors of 30 to 50. In pilot scale studies it was found that most of the absorptive capacity of the carbon surfaces was interior to the wetted surface and that the capacity of the activated surface was only about 10% greater than that of untreated surfaces for service in removing the persistent pesticide Dieldrin from otherwise potable water. Spent carbon surfaces were returned to their initial capacity following electroactivation. (Author)