Effects of temperature and soil components on emissions from pyrolysis of pyrene-contaminated soil

Low-temperature thermal desorption of diesel polluted soil: Influence of temperature and soil texture on contaminant removal kinetics

“…Several studies on thermal desorption treatment have been performed in order to understand the fundamentals of contaminant release [8][9][10] and to investigate the effects of process physical parameters on the remediation efficiency of hydrocarbon contaminants such as PCBs [11,12], PCPs [13], chlorinated solvents [14,15], and PAHs [16,17]. Temperature, treatment time and soil characteristics have been identified as key factors of remedial processes.…”

Fate of pyrene on mineral surfaces during thermal remediation as a function of temperature

“…Previous studies observed cyclopenta[ def ]phenanthrene after thermal treatment of neat pyrene and pyrene-contaminated soil at 1100 °C. 5 Methylation of pyrene is observed at 500 °C with the formation 1-dimethylpyrene (pathway 3). Previous studies on formation reactions with pyrene have shown reductive acetylation of pyrene to cyclopenta[ cd ]pyrene to be the dominant pathway, 39 but methylation of pyrene has been observed under thermal desorption conditions.…”

“…While desorption and/or volatilization of PAHs from soil is typically the goal of remediation, the elevated temperatures of thermally enhanced remediation can also lead to transformation of contaminants. 5 Because of the detection of harmful by-products aer thermal treatment, 5,6 it would be benecial for operators to be able to select conditions that favor degradation of the parent compound(s) into more volatile and less toxic products (e.g., naphthalene, short-chain carbon compounds, ethylene, CO 2 ). One important, yet poorly understand, variable is soil mineralogy, which can greatly impact PAH transformation.…”

“…To accomplish these objectives, pyrene removal experiments were performed at various temperatures in the presence of redox active or redox inactive minerals, and with or without water present. Pyrene was selected as the probe compound for this study because it is representative of the broad class of non-substituted PAHs, should not transform on its own at the temperatures used in this study, 26 has been shown to undergo both degradation and transformation to higher molecular weight compounds in the presence of soil, 5 and is an environmentally relevant pollutant. Some of the most common minerals in soil are silicates (e.g., quartz), feldspars, micas, carbonates, clay, and metal oxides.…”

Investigation of the degradation of pentachlorophenol in sandy soil via low-temperature pyrolysis

“…Soil-pollutant interactions significantly impact soil decontamination chemistry. Due to the application of partially heterogeneous catalysis and thermal supporters [21][22][23], lower temperature and shorter treatment time are required for sandy soil when compared to clay and silt soils [24,25]. In addition, PCP is ionizable hydrophobic organic contaminant (HOC) and the retention of PCP is strongly related to natural organic matter content.…”