Abstract
The heat treatment of oil-contaminated sites is widely carried out for the purposes of remediation. However, heat treatment changes the physical and chemical properties of soil. Before the soil can be reused as a construction material in civil engineering, such as in backfill or road base materials, the changes to its physical properties must be understood. Therefore, this study investigates the changes in the physical and chemical properties of oil-contaminated soil after heat treatment. In this investigation, experimental samples of soil with added oil from a refinery plant are used to investigate the removal rate of total petroleum hydrocarbons (TPHs) by thermal desorption and incineration. The physical properties of the soil, including water permeability and mechanical properties, are compared before and after heat treatment. The results of this study are as follows. (1) Particle size analysis reveals that heat treatment makes soil particles finer. (2) In the burning reduction test, heat treatment at 900 °C removes more than 90% of THP. (3) In the direct shear test, the friction angle (ϕ) increases with the removal rate. (4) In the hydraulic test, as the removal rate increases, the permeability coefficient increases after heat treatment.
Highlights
Soil pollution is an important issue in relation to the environment and public health [1,2]
Heat-treatment methods include hot gas decontamination, thermal desorption, high-temperature incineration, and pyrolysis. All of these methods use heat to separate or accelerate the separation of pollutants. They take a short time and have a high treatment efficiency, and they have been successfully used to treat soil that is contaminated by gasoline, aircraft fuel, and even polychlorinated biphenyls, pesticides, and dense non-aqueous phase liquid (DNAPL)
In each experiment were mixed with gasoline or diesel to the experimental concentration. After they were placed in a high-temperature furnace for heat treatment
Summary
Soil pollution is an important issue in relation to the environment and public health [1,2]. The main pollution components of petroleum-contaminated soils include alkanes, olefins, naphthenes, aromatic hydrocarbons, ethers, and alcohols, such as benzene, toluene, ethylbenzene, and xylene (these four are collectively referred to as BTEX) and trimethylbenzene (TMB). Among various methods for remediating soil with organic pollution, heat treatment is the most extensively used because of its high removal efficiency and short restoration time, and it has been actively developed in recent years. All of these methods use heat to separate or accelerate the separation of pollutants They take a short time and have a high treatment efficiency, and they have been successfully used to treat soil that is contaminated by gasoline, aircraft fuel, and even polychlorinated biphenyls, pesticides, and dense non-aqueous phase liquid (DNAPL). The effects of various heat-treatment operating conditions on soil properties are investigated to provide a reference for future site remediation
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