Thermal treatment of soil co-contaminated with lube oil and heavy metals in a low-temperature two-stage fluidized bed incinerator

Samaksaman, Ukrit; Peng, Tzu-Huan; Kuo, Jia‐Hong; Lu, Chien-Hsing; Wey, Ming‐Yen

doi:10.1016/j.applthermaleng.2015.09.024

Cited by 34 publications

(8 citation statements)

References 58 publications

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“…(2019) performed thermal treatment (∼1,000 °C) on different Pb‐contaminated soils and found that the effect of thermal treatment on Pb immobilization was highly dependent on the soils. Other studies also reported that thermal treatment decreased the concentration and solubility of soil Pb, although the effect of Pb stabilization was different under different heating temperatures (Samaksaman, Peng, Kuo, Lu, & Wey, 2016). Variable results and efficiency in thermal treatment of Pb‐contaminated soils occur in chemical species that fundamentally determine the solubility and volatility of Pb as well as other elements.…”

Section: Introductionmentioning

confidence: 93%

Thermally induced changes in solubility and speciation of lead and iron minerals in a contaminated soil

Sonoda

Hashimoto

Wang

2020

Soil Science Soc of Amer J

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This study investigated the effects of thermal treatment on the solubility and speciation of lead (Pb) adsorbed on synthesized hematite (Pb‐Hm) and in an anthropogenically contaminated soil. The temperature of thermal treatment ranged from 100 to 900 °C, and the speciations of Pb and iron were determined using X‐ray absorption fine structure spectroscopy. In Pb‐Hm samples, the concentration of water‐extractable Pb significantly decreased after being treated at 300 and 600 °C (∼0.50 mg Pb L–1) compared with the untreated sample (9.83 mg Pb L–1). Under this temperature range, about 50% of the Pb‐Hm was transformed into massicot (β‐PbO). At 700 °C and above, a slight increase of water‐extractable Pb was probably caused by the formation of minium (Pb3O4). In the contaminated soil, water‐extractable Pb increased gradually from 0.30 to 0.40 mg Pb L–1 with increasing temperature from 25 to 200 °C; then it decreased rapidly to 0.09 mg Pb L–1 at 300 °C and further decreased to 0.004 mg Pb L–1 at 900 °C. Cerussite (PbCO3) and Pb associated with hematite were the major Pb species in the contaminated soil. In the process of thermal treatment, the significant decrease of water‐extractable Pb in the contaminated soil was caused by the transformation of cerussite into hematite‐associated Pb, accompanied by the transformation from ferrihydrite to hematite.

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Section: Introductionmentioning

confidence: 93%

Thermally induced changes in solubility and speciation of lead and iron minerals in a contaminated soil

Sonoda

Hashimoto

Wang

2020

Soil Science Soc of Amer J

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“…Since the heat and mass transfer efficiencies of the fluidized bed reactors are higher than those of the fixed-bed reactors, the use of two fluidized bed reactors in series for the two-stage gasification may enhance the gasification efficiency, reduce tar and char generation, and increase gas production. Previous works have proved the advantages of a two-stage fluidized bed reactor on both enhancing hydrogen production and control of heavy metal partition during gasification or combustion environment (Lin et al 2019;Peng et al 2019;Samaksaman et al 2016). Furthermore, the bed material of the second-stage reactor may adsorb and retain a portion of heavy metals in the reactants, thereby reducing the emission of heavy metal pollutants during the gasification process; however, research on this aspect is relatively scarce.…”

Section: Introductionmentioning

confidence: 99%

Influence of different fluidization and gasification parameters on syngas composition and heavy metal retention in a two-stage fluidized bed gasification process

Kuo

Lin

et al. 2021

Environ Sci Pollut Res

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Herein, we investigated the influence of gasification and fluidization parameters on the H 2 content of syngas and the retention of heavy metals (Cu and Pb) in a bed material during a two-stage fluidized bed gasification process. The results indicated that a temperature of 900°C in both stages resulted in the highest H 2 content (32.4 mol%) in syngas. When different equivalence ratios (ERs) were investigated, it was found that the highest H 2 content in syngas (25.4 mol%) was achieved at an ER of 0.3. A particle size of 0.46 mm in the fluidized bed led to an increase in the H 2 content of syngas. Moreover, increasing the operating gas velocity led to an increase in the H 2 content of syngas. The heavy metal concentration in the bed material was the highest at 500°C. When the influences of different particle sizes and operating gas velocities were compared, it was observed that a particle size of 0.46 mm and gas velocity of 1.5 U/U mf resulted in increased heavy metal concentrations in the bed material, which indicates that the reduction in the particle size and the increase in the operating gas velocity enhanced gasification and improved the retention of heavy metals.

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“…Until now, many techniques has been developed to remediate heavy-metal-contaminated brownfield-site soils, such as physical, chemical and biological remediation (Kumpiene et al, 2008;Yao et al, 2012). Thermal curing, based on the fraction transformation through high-temperature sintering, is a notable heavy-metal-contaminated soil remediation technology because of its high efficiency and practical advantages (Samaksaman et al, 2016;Li et al, 2019). Through thermal curing, the hazardous metals in contaminated soils can be incorporated into spinel crystal structures and reused as building materials such as bricks in residential and industrial scenarios (Tang et al, 2011;Guo et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Two-step calculation method to enable the ecological and human health risk assessment of remediated soil treated through thermal curing

Xie

Ning

et al. 2021

Soil Ecol. Lett.

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The centralized utilization of heavy-metal-contaminated soil has become the main strategy to remediate brownfield-site pollution. However, few studies have evaluated the ecological and human health risks of reusing these remediated soils. Considering Zn as the target metal, systematic pHdependent leaching and the Community Bureau of Reference (BCR) extraction were conducted at six pH values (pH = 2, 4, 6, 8, 10, 12) for the remediated soil treated through thermal curing. The pHdependent leaching results showed that with the formation of ZnCr 2 O 4 spinel phases, the remediated soil exhibited strong inherent resistance to acidic attack over longer leaching periods. Furthermore, the BCR extraction results showed that the leaching agent pH value mainly affected the acid-soluble fraction content. Moreover, a strong complementary relationship was noted between the leaching and acid-soluble fraction contents, indicating that the sum of these two parameters is representative of the remediated soil risk value. Therefore, we proposed a two-step calculation method to determine the sum of the two heavy metal parameters as the risk value of remediated soil. In contrast to the traditional one-step calculation method, which only uses the leaching content as the risk value, this two-step calculation method can effectively avoid underestimating the risk of remediated soil.

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Thermal treatment of soil co-contaminated with lube oil and heavy metals in a low-temperature two-stage fluidized bed incinerator

Cited by 34 publications

References 58 publications

Thermally induced changes in solubility and speciation of lead and iron minerals in a contaminated soil

Thermally induced changes in solubility and speciation of lead and iron minerals in a contaminated soil

Influence of different fluidization and gasification parameters on syngas composition and heavy metal retention in a two-stage fluidized bed gasification process

Two-step calculation method to enable the ecological and human health risk assessment of remediated soil treated through thermal curing

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