Study on a Dechlorination of PCBs using UV Irradiation

Tajima, Naoki; Kon, Masao; Nishizawa, Kenji; Watanabe, Atsuo

doi:10.3985/jswme.13.141

Cited by 5 publications

(1 citation statement)

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“…[4][5][6][7] When treating PCB wastes, it is also necessary to consider the decomposition of other chemicals present in the wastes. Previously, we found 720 µg/g of tetraphenyltin (TePT) in PCB waste oil.…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of tetraphenyltin contained in polychlorinated biphenyl-based transformer oil simulants in alkaline 2-propanol solution

Yamamoto

Ohara

Noma

et al. 2007

J Mater Cycles Waste Manag

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The photodegradation of tetraphenyltin (TePT) contained in polychlorinated biphenyl (PCB)-based transformer oil simulants by ultraviolet (UV) irradiation in alkaline 2-propanol solutions was examined. In the absence of PCBs, the TePT level fell to below 1% of the initial concentration within 30 min. In the absence of both PCBs and an alkali, the concentrations of tri-, di-, and monophenyltins initially increased to a few milligrams per liter, and then reduced to below the detection limits within 90 min. The addition of an alkali to the reaction solution slightly accelerated the photodecomposition of TePT. The decomposition of other phenyltins (PTs) was also accelerated. When PCBs with concentrations of approximately 80 times the initial TePT concentration were added, only a small fraction of the TePT decomposed within 100 min. Moreover, the levels of PTs did not change during irradiation. TePT and other PTs did decompose when the level of PCBs was reduced to the same concentration as that of TePT; however, the decomposition rates were slower than those in the absence of PCBs. In the actual treatment process, TePT and other PTs in PCB-based transformer oil are decomposed by catalytic reduction, which is used after UV irradiation. Therefore, in the actual treatment of PCB-based transformer oil wastes, pollution due to PTs can be prevented.

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Section: Introductionmentioning

confidence: 99%

Photodegradation of tetraphenyltin contained in polychlorinated biphenyl-based transformer oil simulants in alkaline 2-propanol solution

Yamamoto

Ohara

Noma

et al. 2007

J Mater Cycles Waste Manag

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Light emission phenomena in dechlorination process of polychlorinated biphenyls by irradiating microwave

Kumada

Morimoto

Hidaka

et al. 2011

Applied Physics Letters

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In recent years, an effective processing for PCBs (polychlorinated biphenyls) diluted in insulating oil has been developed, which can render PCBs harmless by their dechlorination using microwave of 2.45 GHz. The authors discovered optical emission of electrical discharge during the processing. To clarify how the emission is involved in the decomposition of PCBs, the emission spectra are two-dimensionally observed with interference filters. The observation reveals the generation of excited hydrogen atoms and ultraviolet photons, both of which accelerate the PCBs dechlorination, and suggests the presence of the electric-field effect of microwave other than its heat effect.

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Temperature of hydrogen radio frequency plasma under dechlorination process of polychlorinated biphenyls

Inada

Abe

Kumada

et al. 2014

Applied Physics Letters

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It has been reported that RF (radio frequency) hydrogen plasmas promote the dechlorination process of PCBs (polychlorinated biphenyls) under irradiation of MW (microwave). A relative emission intensity spectroscope system was used for single-shot imaging of two-dimensional temperature distributions of RF hydrogen plasmas generated in chemical solutions with several mixing ratios of isopropyl alcohol (IPA) and insulation oil under MW irradiation. Our experimental results showed that the plasma generation frequencies for the oil-contaminating solutions were higher than that for the pure IPA solution. In addition, the plasma temperature in the compound liquids including both oil and IPA was higher than that in the pure IPA and oil solutions. A combination of the plasma temperature measurements and plasma composition analysis indicated that the hydrogen radicals generated in a chemical solution containing the equal volumes of IPA and oil were almost the same amounts of H and H+, while those produced in the other solutions were mainly H.

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Study on a Dechlorination of PCBs using UV Irradiation

Cited by 5 publications

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Photodegradation of tetraphenyltin contained in polychlorinated biphenyl-based transformer oil simulants in alkaline 2-propanol solution

Photodegradation of tetraphenyltin contained in polychlorinated biphenyl-based transformer oil simulants in alkaline 2-propanol solution

Light emission phenomena in dechlorination process of polychlorinated biphenyls by irradiating microwave

Temperature of hydrogen radio frequency plasma under dechlorination process of polychlorinated biphenyls

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