Abstract
Different parameters for the treatment of PCBs present intransformer oil (Sovtol-10) using chemical dechlorination with polyethylene alkoxide (KPEG) were evaluated. The effect of the KPEG/oil weight ratio, KOH/PEG mole ratio and polyethylene glycol molecular weight (PEG) using KOH in pellets were determined first. With the optimal values obtained the influence of two other parameters: KOH in powder and ultrasound was investigated. The overall dechlorination performance was assessed in terms of the destruction and removal efficiency (DRE) of PCBs. Average DRE of 93.7 % was obtained under the following conditions: PEG 400, KPEG/oil weight ratio of 30 and KOH/PEG mole ratio 2 for 2 hours of reaction. The ultrasound initially increases DRE of PCBs by 8 % after 10 min of reaction
time. After a reaction time of 120 min no difference in DRE
was measured when using ultrasound.
Keywords
Polychlorinated biphenyls,
dechlorination,
KPEG process,
sovtol,
ultrasound.