Degradation of PCBs and Other Contaminants by Electrochemical Peroxidation

摘要

Laboratory and pilot-scale testing of the Electrochemical peroxidation Process (ECP) has been carried out by the Environmental Research Center (ERC) on various aqueous systems and slurries contaminated with polychlorinated biphenyls (PCBs), petroleum hydrocarbons and chlorinated solvents. These include water and slurries from a subsurface storage tank (SST) contaminated with chlorinated solvents and PCBs, well water contaminated with petroleum hydrocarbons, and groundwater contaminated with chlorinated solvents. The ECP process utilizes a small electric current to enhance Fenton's Reagent reactions. Laboratory testing of ECP on 500 mls of the SST water and slurry containing a small amount (< 1%) of organic sludge resulted in PCB reductions of 97.2 and 68.2%, respectively. Similar results were achieved for solvents with greater than 94% degradation for chloroethane, dichlromethane, 1,1-dichloroethane, 1,1,1-trichloroethane, and acetone in both water and slurry. Pilot tests conducted on 200 liters of SST water resulted in 87.7 and 85.3% degradation of PCBs in duplicate treatments. ECP treatment of gasoline-contaminated well water degraded MTBE, benzene, ethylbenzene, toluene and total xylenes below detectable limits. Concentrations of trichloroethene (TCE), perchloroethene (PCE), and 1,1,2,2-tetrachloroethane (TCEA) in contaminated groundwater from the Massachusetts Military Researvation were reduced by 97.9%, 98.4%, and 82.9%, respectively.