||Electrochemical Carbon Regeneration.
Owen, Paul H. ;
Barry., John P. ;
||Environics, Inc., Huntington Beach, Calif.;Environmental Protection Agency, Washington, D.C. Office of Research and Monitoring.
||EPA-68-01-0040; EPA-17020-HAL; EPA/670/2-75-028;
Activated carbon treatment ;
Sewage treatment ;
Cost estimates ;
Cost comparison ;
Chemical oxygen demand ;
Tertiary sewage treatment ;
Electric power consumption ;
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Electrochemical regeneration of granulated activated carbon spent in the adsorption treatment of municipal secondary effluent was investigated. The adsorption capabilities between electrochemically regenerated carbon and virgin carbon were compared by their respective ability to remove soluble COD organics from sand-filtered secondary effluents during simultaneous dynamic exhaustion. Electrochemical regeneration was able to restore the working capacity to a level of 42 to 61% of the corresponding virgin capacity over the range of experimental conditions investigated. The 61% regeneration electrochemically obtained is calculated as being 77% of the average obtained by the use of thermal regeneration. The electrolysis cell requirement corresponding to the 61% regeneration was measured as 15.3 watthours per gram of COD adsorption capacity regenerated on a spent carbon bed. The calculated cost for electrical power at one cent per kilowatt hour to regenerate and rinse the carbon spent in treating 1,000 gallons of Lake Tahoe-type wastewater is 0.66 cents. This cost is equivalent to 3.2 cents per pound of carbon at a dosage of 207 pounds of carbon per million gallons of effluent.