자외선 및 초음파 공정에 의한 수용액 상의 PCBs 분해

초록

The removal of PCBs (Polychlorinated biphenyls) in aqueous phase was investigated in the ultraviolet (UV) process,ultrasonics (US) process and ultraviolet/ultrasonic (UV/US) process using PCB No.7 and Aroclor 1260. For PCB No.7relatively high removal efficiency over 90% was obtained during 20 min in the UV process and UV/US process. On theother hand, lower removal efficiency of 50 – 70% was achieved for it consisted of individual congeners of PCBscontaining 3~8 of chlorine atom. It was found that the dechlorination reaction (the photolytic cleavage of C-Cl bond) wasconsidered as a main removal mechanism in the UV process while PCBs were removed by cavitation-induced radicalreaction in the US process. No significant dechlorination occurred in the US process. Consequently, it was suggested thatthe UV process or UV/US process was applicable for the removal of PCBs in aqueous phase in terms of the removalefficiency and operation time. In addition, the application of saturating gas such as Ar and Air could be considered tocontrol redox condition and enhance the severity of acoustic cavitation for the removal of PCBs.

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