Effect of Ultrasound on Surfactant-Aided Soil Washing

Na, Seungmin; Park, Yongwoon; Hwang, Anna; Ha, Jihun; Kim, Young-Uk; Khim, Jong Seong

doi:10.1143/jjap.46.4775

Cited by 39 publications

(31 citation statements)

References 22 publications

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“…The water content after drying decreased, the hydrophobic non-volatile portion of the remaining oil, and the dried sample became more hydrophobic, which can enhance the separation. In general, the concentration of TPH in fine soil is higher than it is in coarse soil (Na et al, 2007, Suleimanov et al, 2005, Urum et al, 2004; also in the case of our specimen, almost TPH existed in soil particles that were smaller than 0.149 mm.…”

Section: Gravity Separationcontrasting

confidence: 39%

Recovery of Petroleum Hydrocarbons from Oily Sludge Landfilled Soil

Shin¹,

Park²,

Ko³

et al. 2015

Journal of Soil and Groundwater Environment

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Three types of experiments, based on the physical properties of oily sludge landfilled soil, were conducted to recover total petroleum hydrocarbons (TPH) from the soil. These experiments included gravity separation, solvent extraction using water, and air floatation. The oil portion was not easily separated from the wet (raw) soil because water molecules aggregate the soil particles, despite the fact that the soil was sandy. However, the drying and grinding processes destroyed the aggregates, causing the TPH recovery to increase to approximately 60% when air floatation was used. The drying process decreased the specific gravity of the soil sample, thereby enhancing the overall recovery of TPH from the soil. Although thermal desorption and/or incineration are common choices for heavily dumped sites, physical separation can recover the oil portion instead of simply removing it.

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Section: Gravity Separationcontrasting

confidence: 39%

Recovery of Petroleum Hydrocarbons from Oily Sludge Landfilled Soil

Shin¹,

Park²,

Ko³

et al. 2015

Journal of Soil and Groundwater Environment

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“…Page 110 in removal of diesel by ultrasound from approximately 98% to 77% when the soil particle size was decreased from 1 to 0.1mm; Na et al (2007) also found that the removal of diesel was hindered by the decreased soil particle size, and they explained that the low desorption was due to the increasing surface area and capillary force in fine soils.…”

Section: Time-series Experimental Resultsmentioning

confidence: 95%

“…The degree of enhancement on pollutant removal can be affected by a plenty of factors which have been studied in many researches: sonication power, ultrasonic frequency and intensity, temperature, ultrasonic treatment time, water flow rate, soil particle size, initial hydrocarbon concentration, salinity, surfactant, etc (Feng and Aldrich, 2000;Farmer et al, 2000;Kim and Wang, 2003;Na, et al, 2007;Abramov et al, 2009). …”

Section: Ultrasonic Desorptionmentioning

confidence: 99%

“…However, the ultrasonic power of bath type ultrasound is relatively low comparing to the other treatment systems such as ultrasonic probe treatment system. Ultrasonic probes or horns are more commonly used reactor designs in many scientific researches (Na, S. et al, 2007;Ye et al, 2008;Shrestha, et al, 2009). Ultrasonic probes can be directly placed into the treating sample fluid for reaction.…”

Section: Ultrasonic System Typesmentioning

confidence: 99%

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Remediation of Salt- and Petroleum Hydrocarbon- Contaminated Soils using Ultrasound and Soil Washing.

Song¹

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“…In general, the performance of oil recovery from oily sludge using ultrasonic treatment can be affected by a variety of factors, such as ultrasonic frequency, sonication power and intensity, water content in emulsion, temperature, ultrasonic treatment duration, solid particle size, initial PHCs concentration, salinity, and presence of surfactant (Kim and Wang, 2003;Feng and Aldrich, 2000;Na et al , 2007) . For example, Xu et al (2009) found that lower ultrasonic frequency is more favorable for oily sludge treatment since cavitation is more difficult to occur under high frequency ultrasound than that under low frequency ultrasound, and they also indicated that too high or too low temperature is not suitable for oily sludge treatment by ultrasound.…”

Section: Ultrasonic Irradiationmentioning

confidence: 99%

Development of novel oil recovery methods for petroleum refinery oily sludge treatment

Hu¹

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Oily sludge is one of the most significant wastes generated in the petroleum industry.It is a complex emulsion of various petroleum hydrocarbons (PHCs), water, metals, and fine solids. Due to its hazardous nature and increased generation quantities around the world, the effective treatment of oily sludge has attracted widespread attention. The complexity of its composition and diversity of its origin sources make oily sludge management a difficult and costly undertaking. Many methods have been developed for the treatment of oily sludge through oil recovery or sludge disposal approaches, but no single specific process can be considered as a panacea since each method is associated with different advantages and limitations. Efforts should focus on the improvement of current technologies and the combination of oil recovery with sludge disposal in order to comply with both resource reuse recommendations and environmental regulations. The object of this study was to develop novel combined methods for oil recovery treatment on different refinery oily sludges. The investigation focused on the oil recovery performance of combined methods based on four individual treatment processes including ultrasonic irradiation, solvent extraction, freeze/thaw, and pyrolysis in oily sludge treatment.Firstly, the oil recovery and salt removal effects of ultrasonic irradiation on oil refinery tank bottom sludge were investigated, together with those of direct heating.Ultrasonic power, treatment duration, sludge-to-water ratio, and initial sludge-water slurry temperature were examined for their impacts on sludge treatment. It was found that the increased initial slurry temperature could enhance the ultrasonic irradiation performance, especially at lower ultrasonic power level (i.e., 21 W), but the application of higher-power ultrasonic irradiation could rapidly increase the bulk temperature of slurry. Ultrasonic 2 irradiation had a better oil recovery and salt removal performance than direct heating treatment. More than 60% of PH Cs in the sludge was recovered at an ultrasonic power of 75 W, a treatment duration of 6 min, an initial slurry temperature of 25 °C, and a sludgeto-water ratio of 1 :4, while salt content in the recovered oil was reduced to <5 mg/L, thereby satisfying the salt requirement in refinery feedstock oil. In general, ultrasonic irradiation could be an effective method in terms of oil recovery and salt removal from refinery oily sludge, but the separated wastewater still contains relatively high concentrations of PH Cs and salt which requires proper treatment.Two types of ultrasonic assisted extraction (UAE) treatment including UAE probe (UAEP) system and UAE bath (UAEB) system were investigated for oil recovery from refinery oily sludge. Their oil recovery efficiencies were compared to that of mechanical shaking extraction (MSE). Three solvents including cyclohexane (CHX), ethyl acetate (EA), and methyl ethyl ketone (MEK) were examined as the extraction solvents. The influence of experimental factors on oil an...

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Effect of Ultrasound on Surfactant-Aided Soil Washing

Cited by 39 publications

References 22 publications

Recovery of Petroleum Hydrocarbons from Oily Sludge Landfilled Soil

Recovery of Petroleum Hydrocarbons from Oily Sludge Landfilled Soil

Remediation of Salt- and Petroleum Hydrocarbon- Contaminated Soils using Ultrasound and Soil Washing.

Development of novel oil recovery methods for petroleum refinery oily sludge treatment

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