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Photocatalytic Degradation of Dielectric Mineral Oil with PCBs Content Coupled with Algae Treatment
Summary
This study tested photocatalytic oxidation combined with microorganism treatment to degrade insulating oil contaminated with polychlorinated biphenyls (PCBs), a persistent toxic pollutant. The combined approach improved degradation efficiency compared to either method used alone.
Insulating oil contaminated with polychlorinated biphenyls (PCBs) is an environmentally important pollutant. This research focused on the establishment of the optimum conditions under which photocatalytic oxidation can be used together with biotreatment using the <i>Nostoc</i> sp. microorganism to degrade PCBs present in used dielectric oils. Among the optimal conditions studied were PCB concentration, initial pH, and titanium dioxide (TiO<sub>2</sub>) concentration for the photocatalytic step, and PCB concentration and photoperiod for the biotreatment step. The results indicate that the optimal conditions necessary for photocatalytic degradation were a pH of 6.10, 113 mg/L TiO<sub>2</sub>, and 765 mg/L PCBs, achieving close to 90% removal. For the biotreatment step, the results showed that PCBs progressively inhibited the microbiological growth, with the lowest cellular growth observed in the medium with the highest PCB concentration.
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