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SUSTAINABLE REMEDIATION OF DIESEL-CONTAMINATED SOIL BY LOW-TEMPERATURE THERMAL TREATMENT: IMPROVED ENERGY EFFICIENCY AND SOIL REUSABILITY
J. Ren, X. Song, and D. Ding. | Chemosphere 241:124952(2020)

Low-temperature thermal treatment (LTTT) was used as an energy-efficient technique to remediate diesel-contaminated soil. The study investigated the impacts of LTTT on the physiochemical and ecological properties of soils to evaluate the reusability of heated soil. Heating at 250°C for 10 min reduced total petroleum hydrocarbon concentration from 6,271 mg/kg to 359 mg/kg, which is lower than the Chinese risk screening level of 826 mg/kg. After LTTT, most soil physiochemical properties were nearly unchanged, and the NO3--N and NH4+-N contents increased. LTTT-remediated soil was favorable to germinate and grow wheat. The microbial community changed substantially but recovered after being mixed with uncontaminated soil. Pyrolysis was the dominant mechanism of diesel removal. A biochar-like pyrolytic carbon was formed, which improved the soil reusability.



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