Degradation of pentachlorophenol in soil by pulsed corona discharge plasma

Wang, Tie Cheng; Lü, Na; Li, Jie; Wu, Yan

doi:10.1016/j.jhazmat.2010.04.049

Cited by 82 publications

(24 citation statements)

References 28 publications

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“…3. The NAPL removal efficiency was an increasing function of energy density, which is similar to that reported in the literature (Wang et al 2010(Wang et al , 2011Lou et al 2012). At lower energy densities, the NAPL removal efficiency increased rapidly, while at higher energy densities, the NAPL removal efficiency increased slowly tending asymptotically to stabilize (Fig.…”

Section: Effects Of Energy Density and Napl Concentration On Napl Remsupporting

confidence: 87%

“…Recently, a limited number of studies have been published on the treatment of polluted soils by NTP technologies (Wang et al 2010(Wang et al , 2011Redolfi et al 2010;Lou et al 2012). An electrical discharge can be created in the contaminated soil by imposing a high electric potential between two electrodes.…”

Section: Introductionmentioning

confidence: 99%

“…An electrical discharge can be created in the contaminated soil by imposing a high electric potential between two electrodes. In particular, dielectric barrier discharge (DBD) has been used to remediate soils contaminated by kerosene and chloramphenicol (Redolfi et al 2010;Wang et al 2011), while low-temperature pulsed corona discharge plasma has been used for the degradation of pentachlorophenol and p-nitrophenol in contaminated soils (Wang et al 2010;Lou et al 2012). Up-to-date, a little attention has been paid on the scale-up of the plasma discharge techniques to large-scale systems with the capacity to remediate soils under continuous feed conditions.…”

Section: Introductionmentioning

confidence: 99%

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Non-aqueous phase liquid-contaminated soil remediation by ex situ dielectric barrier discharge plasma

Aggelopoulos

Tsakiroglou

Ognier

et al. 2014

Int. J. Environ. Sci. Technol.

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Non-thermal dielectric barrier discharge plasma is examined as a method for the ex situ remediation of non-aqueous phase liquid (NAPL)-contaminated soils. A mixture of equal mass concentrations (w/w) of n-decane, ndodecane and n-hexadecane was used as model NAPL. Two soil types differing with respect to the degree of micro-heterogeneity were artificially polluted by NAPL: a homogeneous silicate sand and a moderately heterogeneous loamy sand. The effect of soil heterogeneity, NAPL concentration and energy density on soil remediation efficiency was investigated by treating NAPL-polluted samples for various treatment times and three NAPL concentrations. The concentration and composition of the residual NAPL in soil were determined with NAPL extraction in dichloromethane and GC-FID analysis, while new oxidized products were identified with attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). The experimental results indicated that the overall NAPL removal efficiency increases rapidly in early times reaching a plateau at late times, where NAPL is removed almost completely. The overall NAPL removal efficiency decreases with its concentration increasing and soil heterogeneity strengthening. The removal efficiency of each NAPL compound is inversely proportional to the number of carbon atoms and consistent with alkane volatility. A potential NAPL degradation mechanism is suggested by accounting for intermediates and final products as quantified by GC-FID and identified by ATR-FTIR.

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Section: Effects Of Energy Density and Napl Concentration On Napl Remsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Non-aqueous phase liquid-contaminated soil remediation by ex situ dielectric barrier discharge plasma

Aggelopoulos

Tsakiroglou

Ognier

et al. 2014

Int. J. Environ. Sci. Technol.

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“…) (Aggelopoulos et al 2015b), whereas intermediates of 2,6-dichloropyridine oxidation are not available. It has been reported that the intermediates produced from the ozonation or plasma oxidation of chlorinated molecules (e.g., PCP) were less toxic than the initial pollutant (Anotai et al 2007;Wang et al 2010). However, a detailed intermediates identification and toxicity tests is needed to be further study.…”

Section: Pollutant Degradation Mechanismmentioning

confidence: 99%

“…During the last few years, they have started to be examined for soil remediation (Wang et al 2010;Lou et al 2012;Ognier et al 2014;Aggelopoulos et al 2015a). During NTP discharge at atmospheric pressure, high-energy electrons are produced, providing thus space charge and highly reactive oxidative species including active radicals (O, OH, H radicals) and active molecules (O 3 , NO x , H 2 O 2 ).…”

Section: Introductionmentioning

confidence: 99%

Atmospheric pressure dielectric barrier discharge for the remediation of soil contaminated by organic pollutants

Aggelopoulos

2016

Int. J. Environ. Sci. Technol.

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The remediation of soil, contaminated by organic pollutants, in a cylinder-to-plane dielectric barrier discharge reactor at atmospheric air pressure was reported. Two model organic pollutants were selected; a solid pollutant (2,6-dichloropyridine) and a liquid pollutant (n-dodecane). The effects of the contaminant's initial concentration and state, the energy consumption, and the soil type on the pollutant removal efficiency were investigated. To that scope, various contaminated samples of both quartz sand and loamy sandy soil were treated by plasma for various treatment times and initial 2,6-dichloropyridine/ n-dodecane concentrations. The results revealed that (1) the removal efficiency of 2,6-dichloropyridine was higher compared to that of n-dodecane at a given plasma treatment time and (2) the removal efficiency increased with the energy density increasing, but decreased as the soil heterogeneity, organic matter and pollutant concentration were enhanced. The main removal mechanism proposed is the evaporation of pollutant molecules coupled with their oxidation by plasma species in the gas and solid/liquid phase.

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Simulation and Experimental Study for Degradation of Organic Dyes Using Dual pin‐to‐plate Corona Discharge Plasma reactors for Industrial Wastewater Treatment

El-Tayeb

El-Shazly

Elkady

et al. 2016

Contrib. Plasma Phys.

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This work researches the possibility of increasing the dye removal efficiency from wastewater using nonthermal plasma. A study for the optimal air gap distance between dual pin and surface of Acid Blue 25 dye solution and thickness of ground plate is carried out using 3D-EM simulator to find maximum electric field intensity at the tip of both pins. The consequences display that the best gap for corona discharge is approximately 5 mm using 15 kV source. In addition, the optimum plate thickness is 0.1 mm. These distance and thickness were mentioned are constant during the study of other factors. Dual pin-to-plate high-voltage corona discharge plasma system is presented to investigation experimentally the gap distance, thickness of ground plate, initial dye concentration, pH solution and conductivity on the amount of Acid Blue 25 dye color removal efficiency from wastewater. There is a large consensus among the simulation and experimental work in the air gap and thickness of ground plate. Where the decolorization for air gap 5 mm is 95.74 at time 35 min compared with 91% and 17% for 1 mm and 20 mm gap distance respectively. Also, the discharge energy at each air gap are calculated. Measurement results for the impact of thickness of an Aluminum ground plate on color removal competence showed color removal efficiencies of 86.3%, 90.78% and 98.06%, after treatment time 15 min for thicknesses of 2, 0.5 and 0.1 mm respectively. The decolorization behavior utilizing dual pin-toplate corona discharge plasma system display 82% pigment evacuation proficiency inside 11min. The complete decolorization was accomplished within 28min for distinctive examined introductory color focuses 5 ppm up to 100 ppm. Likewise, the impacts of conductivity by utilizing diverse salts as AlCl3, CaCl2, KCl and NaCl and with distinctive focuses have been explored. The rising of the solution conductivity leads to the reduction of decolorization efficiency. The decolorization efficiency and discharge energy are calculated at different concentration molarity for AlCl3, CaCl2, KCl and NaCl. It was observed that the presence of salts at the same concentration level substantially decreased the rate and the extent of decolorization. The results indicate that the optimum pH for the decolorization of Acid Blue 25 dye is in the range between 3 and 6. Furthermore the conductivity and discharge energy were measurement at each value of pH. Energy yield for decolorization and Electrical Energy per Order (EE/O) under different initial pH value were calculated. A kinetic model is used to define the performance of corona discharge system under different value of pH. The model of pseudo -zero, pseudo-first order, and pseudo-second order reactions kinetic are utilized to investigate the decolorization of Acid Blue 25 dye. The rate of degradation of Acid Blue 25 dye follows the pseudo-first order kinetics in the dye concentration. Energy consumption requirements for decolorization was considered. The outcomes will be useful for designing the plasma treatment systems ...

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Degradation of pentachlorophenol in soil by pulsed corona discharge plasma

Cited by 82 publications

References 28 publications

Non-aqueous phase liquid-contaminated soil remediation by ex situ dielectric barrier discharge plasma

Non-aqueous phase liquid-contaminated soil remediation by ex situ dielectric barrier discharge plasma

Atmospheric pressure dielectric barrier discharge for the remediation of soil contaminated by organic pollutants

Simulation and Experimental Study for Degradation of Organic Dyes Using Dual pin‐to‐plate Corona Discharge Plasma reactors for Industrial Wastewater Treatment

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