Sea Marconi has recently started in Sweden a campaign for the decontamination treatment from PCBs with the ambitious target of 2 mg/Kg (ppm w/w). The activity, which shall have a total duration of about four months, involves the complete dehalogenation of 8 transformers with 15 tons of oil each at an important industrial site in Central Sweden. The Customer has chosen the “on-load” treatment option, with the transformer in operation and under load for the entire duration of the treatment; this means zeroing loss of production within the full compliance with the budget obligations.At the moment, two transformers have already been brilliantly decontaminated from PCBs fulfilling the severe target of 2 mg/kg. All the transformers shall be dehalogenated by the CDP Process®, exclusive service by Sea Marconi, providing a complete removal of the PCBs from the oil and the transformer. This modality is carried out on-site in continuous mode, using decontamination mobile units (DMUs) by Sea Marconi. Our units suck the oil from the lower side of the transformer, decontaminate it thanks to a patented reagent and pump it back into the top side of the transformer. Passage after passage, the oil recovers the original properties. Moreover, the circulation of the oil provides also the elimination of the physical contaminants that normally are deposited inside the transformer at the bottom of the tank and on the papers. After completely dehalogenating the oil and the equipment, our experts carry out a new diagnosis summarising the results achieved certifying that the transformer is “PCBs-free”.CDP Process® is the technology considered as BAT/BEP (Best Available Technique/ Best Environmental Practice) also included in the brochure CIGRE no. 413 (April 2010) since it represents a solution providing the re-classification PCBs-free for the oil and equipment with both a financial and environmental advantages.
