Transport characteristics of gas phase ozone in soil during soil remediation by pulsed discharge plasma

Wang, Tie Cheng; Qu, Guangzhou; Li, Jie; Lü, Na

doi:10.1016/j.vacuum.2013.07.020

Cited by 31 publications

(13 citation statements)

References 27 publications

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“…Effect of dry/moist sand with or without metal oxides on consumed ozone Moist soils are one of the properties that affect ozone transport in soil (Wang et al 2014). The effect of the different water contents (5, 10, 15% w/w) on the consumed ozone was studied (Fig.…”

Section: Resultsmentioning

confidence: 99%

Catalytic effect of γ-Al(OH)3, α-FeOOH, and α-Fe2O3 on the ozonation-based decomposition of diethyl phthalate adsorbed on sand and soil

Ruiz

Rodríguez

Poznyak

et al. 2020

Environ Sci Pollut Res

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Diethyl phthalate (DEP) is a pollutant which can be found on soils as a result of its widespread application in plastic industry. Soil contaminated with DEP requires the application of different chemical methods to attain its remediation. Among these methods, ozonation has proven to be effective against toxic soil pollutants. The presence of metal oxides in soil is a possible source of catalytic effect. In this study, it was analyzed the catalytic effect of goethite (α-FeOOH), hematite (α-Fe 2 O 3 ), and gibbsite (γ-Al(OH) 3 ) in combination with O 3 to achieve DEP decomposition. The DEP elimination efficiency by ozonation on the sand increased according to the following order: without catalyst < γ-Al(OH) 3 < α-Fe 2 O 3 < α-FeOOH. Among these three oxides, goethite has the highest OH groups density. The reaction of OH groups and O 3 favors the formation of oxidant species, such as O 2 • − and OH•. The effect of the moisture content, the catalyst concentration, and the type of soil (sand and calcined soil) were also studied. The latter had a significant influence on the total organic carbon (TOC) removal. The mineralization degree was 84% in the O 3 -soil system, while only 40% was obtained with O 3 -sand (α-FeOOH) in dry sand after 8 h of treatment. Calcined soil promoted the increase of TOC removal due to the presence of different metal oxides, which were active centers for O 3 decomposition. The toxicity tests of the three reaction systems (O 3 -sand, O 3 -sand (α-FeOOH), and O 3 -soil) were evaluated on lettuce seed germination before and after DEP ozonation.

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Section: Resultsmentioning

confidence: 99%

Catalytic effect of γ-Al(OH)3, α-FeOOH, and α-Fe2O3 on the ozonation-based decomposition of diethyl phthalate adsorbed on sand and soil

Ruiz

Rodríguez

Poznyak

et al. 2020

Environ Sci Pollut Res

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“…When plasma production occurs, electrons with high energy are produced, affording highly reactive species and space charge. Highly reactive species include ˙OH, O and H radicals, and ozone, H2O2 molecules (Lou et al, 2012, Wang et al, 2015, Wang et al, 2014b.…”

Section: Plasma Oxidationmentioning

confidence: 99%

An Overview of Chemical Oxidation Based Remediation technologies for Non-Aqueous Phase Liquids Removal from Soil

2022

Global NEST: The International Journal

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<p>This review provides a general overview of the application of chemical oxidation to hydrophobic contaminants in the form of non-aqueous phase liquids (NAPLs). Three types of chemical oxidation processes, conventional activated persulfate, permanganate, and ozonation, along with three advanced oxidation processes (AOPs), the Fenton process, photocatalysis, and plasma oxidation are presented discussed. In addition, this paper provides a brief insight into the combination of chemical oxidation with other remediation technologies for the efficient removal of NAPLs. The common and wide use of activated persulfate for soil remediation is hindered by the fact that it needs heat activation, whereas the main drawback of using permanganate is the precipitation of manganese oxide at the NAPLs face. In addition, the high cost of equipment at the site restricts the ozone application for in-suit soil remediation. The application of AOPs processes such as Fenton and plasma oxidation has received great attention due to its high removal efficiency. However, photocatalysis technology in the field is difficult because it needs photo energy to run the oxidation process. Although plasma oxidation can degrade contaminants in minutes, some active species have short-lived time that could disappear before entering the soil layer. Ozonation is efficient in treat soils with low moisture and large pore spaces. Nevertheless, the optimal pH for ozonation oxidation is 3, which is hard to achieve in real-world applications. Combining chemical oxidation with other remediation technology is a valuable technique of soil remediation as the synergetic effects may increase the sustainability of the applied process towards green technology for soil remediation.</p>

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“…Furthermore, the degradation efficiency was negatively affected by the concentration of PCP and positively affected by time and oxygen (Wang et al, 2013). After the study, the authors carried out further investigations in order to understand the influence of gaseous ozone transport (Wang et al, 2014b) and soil depth (Wang et al, 2014c) on PCP degradation. Wang et al (2014a) found that the use of corona pulsed discharge plasma removed 86 and 94.1% of p-nitrophenol (PNP) and pentachlorophenol (PCP), respectively, from contaminated soils.…”

Section: Plasma Oxidation and Ozonationmentioning

confidence: 99%

Remediation of Soils Contaminated by Pesticides Using Physicochemical Processes: a Brief Review

et al. 2019

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After years of pesticide application, often indiscriminately, damage has been caused to the environment, as well as to agronomic crops grown in contaminated areas. In water treatment, techniques based on physical and/or physicochemical processes are used, being formed secondary oxidizing agents responsible for the mineralization of contaminants present in the herbicides, thus causing the degradation process. However, few studies have demonstrated the effectiveness of these techniques in soils. The aim of this study was to review the existing studies, presenting the main techniques used for remediation of soils contaminated with pesticides. Emphasis was placed on electrokinetics, advanced oxidative processes, soil washing, chemical or solvent extraction, and combinations of these methods. According to the results of several studies, the combination of techniques, such as electrokinetics and soil washing processes, allows achieving a high efficiency when it is applied for the degradation of agricultural contaminants. The combination of electrolysis with other methods, such as the Fenton’s reagent, ultrasound irradiation, and UV light, also present satisfactory results in removing pesticides in soil treatment. However, Fenton technology used alone is the most promising of the assessed techniques since it can be used for the remediation of several contaminants, especially pesticides, not harming the environment and allowing soil recovery.

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Transport characteristics of gas phase ozone in soil during soil remediation by pulsed discharge plasma

Cited by 31 publications

References 27 publications

Catalytic effect of γ-Al(OH)3, α-FeOOH, and α-Fe2O3 on the ozonation-based decomposition of diethyl phthalate adsorbed on sand and soil

Catalytic effect of γ-Al(OH)3, α-FeOOH, and α-Fe2O3 on the ozonation-based decomposition of diethyl phthalate adsorbed on sand and soil

An Overview of Chemical Oxidation Based Remediation technologies for Non-Aqueous Phase Liquids Removal from Soil

Remediation of Soils Contaminated by Pesticides Using Physicochemical Processes: a Brief Review

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