Different Methods for Polychlorinated Biphenyls Removal from Contaminated Soils

The paper presents results of laboratory experiments focused on the efficiency of polychlorinated biphenyls (PCBs) removal by electroremediation, pyrolysis and incineration decontamination methods. The experiments were carried out using soil contaminated with heavy metals and PCBs. Different process parameters were changed during the experiments in order to achieve maximum removal efficiency. Concerning the thermal methods (pyrolysis and incineration), the operating temperature and retention time were the two key parameters affecting the processes that were assessed. With regards to the electroremediation alternative for soil decontamination, the redox potential (ORP), pH, electric field and temperature were continuously monitored. Results showed that thermal treatments are the most indicated methods for removing PCBs from contaminated soils. Pyrolysis and incineration remediation methods ensured, with some exceptions, an efficiency of over 99%. The same efficiency level was attended just in case of applying the electrochemical method for removing PCB126.