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Removal of alachlor in water by non-thermal plasma : reactive species and pathways in batch and continuous process

(2019) WATER RESEARCH. 161. p.549-559
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Abstract
Pesticides are emerging contaminants frequently detected in the aquatic environment. In this work, a novel approach combining activated carbon adsorption, oxygen plasma treatment and ozonation was studied for the removal of the persistent chlorinated pesticide alachlor. A comparison was made between the removal efficiency and energy consumption for two different reactor operation modes: batch-recirculation and single-pass mode. The kinetics study revealed that the insufficient removal of alachlor by adsorption was significantly improved in terms of degradation efficiency and energy consumption when combined with the plasma treatment. The best efficiency (ca. 80% removal with an energy cost of 19.4 kWh m(-3)) was found for the single-pass operational mode of the reactor. In the batch-recirculating process, a complete elimination of alachlor by plasma treatment was observed after 30 min of treatment. Analysis of the reactive species induced by plasma in aqueous solutions showed that the decomposition of alachlor mainly occurred through a radical oxidation mechanism, with a minor contribution of long-living oxidants (O-3, H2O2). Investigation of the alachlor oxidation pathways revealed six different oxidation mechanisms, including the loss of aromaticity which was never before reported for plasma-assisted degradation of aromatic pesticides. It was revealed that the removal rate and energy cost could be further improved with more than 50% by additional O-3 gas bubbling in the solution reservoir. (C) 2019 Elsevier Ltd. All rights reserved.
Keywords
Non-thermal plasma, Pesticides, Alachlor, Oxidative species, By-products, ADVANCED OXIDATION PROCESSES, AQUATIC ENVIRONMENT, CORONA DISCHARGE, MICROPOLLUTANTS, OZONATION, DEGRADATION, CONTACT

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Chicago
Wardenier, Niels, Yury Gorbanev, Ineke Van Moer, Anton Nikiforov, Stijn Van Hulle, Pieter Surmont, Frederic Lynen, Christophe Leys, Annemie Bogaerts, and Patrick Vanraes. 2019. “Removal of Alachlor in Water by Non-thermal Plasma : Reactive Species and Pathways in Batch and Continuous Process.” Water Research 161: 549–559.
APA
Wardenier, N., Gorbanev, Y., Van Moer, I., Nikiforov, A., Van Hulle, S., Surmont, P., Lynen, F., et al. (2019). Removal of alachlor in water by non-thermal plasma : reactive species and pathways in batch and continuous process. WATER RESEARCH, 161, 549–559.
Vancouver
1.
Wardenier N, Gorbanev Y, Van Moer I, Nikiforov A, Van Hulle S, Surmont P, et al. Removal of alachlor in water by non-thermal plasma : reactive species and pathways in batch and continuous process. WATER RESEARCH. 2019;161:549–59.
MLA
Wardenier, Niels et al. “Removal of Alachlor in Water by Non-thermal Plasma : Reactive Species and Pathways in Batch and Continuous Process.” WATER RESEARCH 161 (2019): 549–559. Print.
@article{8620323,
  abstract     = {Pesticides are emerging contaminants frequently detected in the aquatic environment. In this work, a novel approach combining activated carbon adsorption, oxygen plasma treatment and ozonation was studied for the removal of the persistent chlorinated pesticide alachlor. A comparison was made between the removal efficiency and energy consumption for two different reactor operation modes: batch-recirculation and single-pass mode. The kinetics study revealed that the insufficient removal of alachlor by adsorption was significantly improved in terms of degradation efficiency and energy consumption when combined with the plasma treatment. The best efficiency (ca. 80% removal with an energy cost of 19.4 kWh m(-3)) was found for the single-pass operational mode of the reactor. In the batch-recirculating process, a complete elimination of alachlor by plasma treatment was observed after 30 min of treatment. Analysis of the reactive species induced by plasma in aqueous solutions showed that the decomposition of alachlor mainly occurred through a radical oxidation mechanism, with a minor contribution of long-living oxidants (O-3, H2O2). Investigation of the alachlor oxidation pathways revealed six different oxidation mechanisms, including the loss of aromaticity which was never before reported for plasma-assisted degradation of aromatic pesticides. It was revealed that the removal rate and energy cost could be further improved with more than 50% by additional O-3 gas bubbling in the solution reservoir. (C) 2019 Elsevier Ltd. All rights reserved.},
  author       = {Wardenier, Niels and Gorbanev, Yury and Van Moer, Ineke and Nikiforov, Anton and Van Hulle, Stijn and Surmont, Pieter and Lynen, Frederic and Leys, Christophe and Bogaerts, Annemie and Vanraes, Patrick},
  issn         = {0043-1354},
  journal      = {WATER RESEARCH},
  keywords     = {Non-thermal plasma,Pesticides,Alachlor,Oxidative species,By-products,ADVANCED OXIDATION PROCESSES,AQUATIC ENVIRONMENT,CORONA DISCHARGE,MICROPOLLUTANTS,OZONATION,DEGRADATION,CONTACT},
  language     = {eng},
  pages        = {549--559},
  title        = {Removal of alachlor in water by non-thermal plasma : reactive species and pathways in batch and continuous process},
  url          = {http://dx.doi.org/10.1016/j.watres.2019.06.022},
  volume       = {161},
  year         = {2019},
}

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