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Applicability of pulsed corona discharge treatment for the degradation of chloroform
Sarathi Ramanujam,
Published in Elsevier B.V.
2019
Volume: 360
   
Pages: 1341 - 1354
Abstract
Degradation of chloroform was investigated using plasma corona discharge by a needle-plate reactor. Chloroform concentration of 200 mg/L was completely degraded in 10 min of treatment. Almost complete dechlorination happened in 10 min and 91% total organic carbon (TOC) removal occurred in 12 min of treatment. Several important parameters such as input voltage, initial concentration, pH, conductivity, alkalinity, presence of [rad]OH radical and aqueous electron scavengers were evaluated to understand their effect on rate of chloroform degradation. The degradation rate of chloroform increased with increase in pH, conductivity and alkalinity of the solution. The maximum concentrations of [rad]OH radical, H 2 O 2 and superoxide produced after 10 min of corona discharge were estimated to be 0.260 mM, 0.353 mM and 0.046 mM respectively. Various intermediates such as dichloromethane, dichloroethane, trichloroethane, trichloroethylene (TCE), tetrachloroethylene (PCE), trichloronitromethane and acetaldehyde were identified using GC-MS purge and trap technique. Based on the identified intermediates, reductive and oxidative degradation pathway of chloroform is proposed. © 2018 Elsevier B.V.
About the journal
JournalData powered by TypesetChemical Engineering Journal
PublisherData powered by TypesetElsevier B.V.
ISSN13858947
Open AccessNo
Concepts (17)
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    Alkalinity
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    Dechlorination
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    Degradation
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    Dichloromethane
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    ELECTRIC CORONA
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    Free radicals
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    Organic carbon
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    pH
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    CHLOROFORM CONCENTRATIONS
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    CORONA DISCHARGES
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    DEGRADATION PATHWAYS
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    Initial concentration
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    MAXIMUM CONCENTRATIONS
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    Oh radical
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    PULSED CORONA DISCHARGES
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    PULSED-POWER PLASMAS
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    Electric discharges