Effects of mineral species and petroleum components on thermal desorption behavior of petroleum-contaminated soil

Zhi-ying, Xiao; Guo, Shuhai; Cheng, Fenglian; Wang, Sa

doi:10.1016/j.chemosphere.2022.135548

Cited by 13 publications

(4 citation statements)

References 40 publications

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“…Energy consumption and cost are important to evaluate the practical application of a technology. The simple energy consumption and cost of PCS remediation for Fenton oxidation–pyrolysis (370°C, 30 min) and pyrolysis (490°C, 30 min) with identical TPH removal rates were estimated based on literature [ 46 ] and industrial knowledge, and are listed in Table 4. Totally, 4.46 × 10 6 kJ of energy and 268 US$ were consumed after treating 1 t of PCS by pyrolysis at 490°C in 30 min, while 2.81 × 10 6 kJ of energy and 102 US$ were required in the cascade Fenton oxidation–pyrolysis.…”

Section: Resultsmentioning

confidence: 99%

Section: Energy Consumption and Cost Analysismentioning

confidence: 99%

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Remediation of petroleum‐contaminated soil by Fenton oxidation–pyrolysis

Gu,

Zhou,

Zhu

et al. 2024

CLEAN Soil Air Water

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Petroleum‐contaminated soil (PCS) is urgently to be remediated due to its risk to ecological environment and human health. In this study, a Fenton oxidation–pyrolysis strategy was employed to accomplish effective petroleum removal and PCS remediation. The highest total petroleum hydrocarbon removal efficiency could achieve 99.6% after 2 h Fenton oxidation, with H2O2/Fe2+, 6:1, and pH 3, followed by pyrolysis at 370°C. The organic compositions of the soil after Fenton oxidation, the kinetics and process of the pyrolysis, morphologies and structures of the treated soil, as well as energy consumption and cost savings were comprehensively researched and analyzed. Through the Fenton oxidation–pyrolysis treatment, the macromolecules were effectively degraded and the contents of asphaltenes and resins were significantly reduced in the soil. Graphitized carbon was dominatingly existed after the pyrolysis. A 1.5 order reaction model was proposed to reasonably describe the pyrolysis remediation process of PCS. The Fenton oxidation–pyrolysis treatment can reduce energy consumption and cost compared with pyrolysis alone. This work not only offered an alternative approach of PCS remediation, but also provided theoretical guidance for practical soil remediation.

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Section: Resultsmentioning

confidence: 99%

Section: Energy Consumption and Cost Analysismentioning

confidence: 99%

Remediation of petroleum‐contaminated soil by Fenton oxidation–pyrolysis

Gu,

Zhou,

Zhu

et al. 2024

CLEAN Soil Air Water

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“…Different types of saturates, aromatics, and resins in SAR exhibit different volatilities (Xiao et al 2022), and hence specific product fractions were analyzed. Figures 6a and 6d show the ion chromatograms of saturates.…”

Section: Chemical Components Analysis Of Sarmentioning

confidence: 99%

Quantitative determination of petroleum hydrocarbons in oily sludge following efficient n-heptane separation

Zhang¹,

Ma²,

Qin³

et al. 2023

BioRes

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Accurate analysis of the main chemical components of oil-bearing sludge is an important prerequisite for effective soil remediation and resource reuse. However, precise analysis of the extract components is difficult to achieve because of the mutual interference of saturates, aromatics, and resins, collectively called SAR, and asphaltene that are introduced during chloroform extraction. In this study, SAR was efficiently extracted using n-heptane, while asphaltene components were retained in soil because of their insolubility in n-heptane. The maximum yield of SAR extraction was 27.0%, indicating an increase of 1.75% compared to chloroform extraction. The extracted SAR components were separated by chromatography and the main structural units and components were analyzed. The results show that saturates, aromatics, and resins have a single component, a high content of major components, and contain fewer impurities using n-heptane extraction. Moreover, the solubility of asphaltene was inhibited during the effective extraction of SAR components with n-heptane and did not influence the subsequent analysis of SAR component. Efficient SAR extraction, accurate SAR component analysis, and high efficiency asphaltene separation was achieved using n-heptane-extraction-assisted pyrolysis. This provides a new method for the component analysis of oily sludge and promotes its efficient separation.

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“…Thermal desorption is the process of destroying contaminants by incineration or activated carbon adsorption after they have been volatilized and separated from the soil by heating to a certain temperature. Heating temperature, residence time, and contaminated soil properties are key factors in the engineering application of thermal desorption technology, and current studies have mainly used indoor simulation devices to analyze the effects of each factor on PAH removal efficiency [12][13][14]. Soil temperature influences its physicochemical properties [15][16][17][18][19], which will in turn affect the reuse possibilities of soil after remediation.…”

Section: Introductionmentioning

confidence: 99%

Influence of Thermal Desorption Technology on Removal Effects and Properties of PAH-Contaminated Soil Based on Engineering Experiments

Zhang,

Li,

Shi

et al. 2024

Agronomy

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Polycyclic aromatic hydrocarbon (PAH) contamination in soil poses a serious threat to ecological safety, human life, and health. Thermal desorption is commonly used to remediate PAH-contaminated soil. Current thermal desorption research primarily focuses on parameters for engineering designs through in-house simulations. In this study, based on a PAH-contaminated site thermal desorption remediation project, the removal efficiency of PAHs in soil (S1, S2) after disposal at different heating temperatures (400, 450, 500, 550 °C) and different residence times (20, 25 min) was investigated, and changes in soil properties before and after disposal were analyzed. The removal rate of 16 PAHs from soil at two concentrations reached 100% after 20 min at 500 °C and 550 °C, respectively. The three-phase structural distances of S1 and S2 soils, respectively, increased by 1.65 and 2.99 times after disposal, sand content increased by 3.20% and 8.27%, water-stable macroaggregates decreased by 8.14% and 2.06%, organic carbon content decreased by 7.27% and 27.05%, heavy fraction organic carbon increased by 33.68% and 5.12%, pH decreased from 10.00 and 10.35 to 8.81 and 8.69, and cation exchange decreased by 13.79% and 26.65%. Soil nutrient content such as TP, AP, TK, and AK increased after thermal desorption, and TN content decreased; approximately 1.0 mg/kg of NO3−-N remained. Our results are expected to support the design of programs for soil reuse after disposal.

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Effects of mineral species and petroleum components on thermal desorption behavior of petroleum-contaminated soil

Cited by 13 publications

References 40 publications

Remediation of petroleum‐contaminated soil by Fenton oxidation–pyrolysis

Remediation of petroleum‐contaminated soil by Fenton oxidation–pyrolysis

Quantitative determination of petroleum hydrocarbons in oily sludge following efficient n-heptane separation

Influence of Thermal Desorption Technology on Removal Effects and Properties of PAH-Contaminated Soil Based on Engineering Experiments

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