Application of high frequency ultrasound in the destruction of DDT in contaminated sand and water

Thangavadivel, Kandasamy; Megharaj, Mallavarapu; Smart, Roger St. C.; Lesniewski, Peter J.; Naidu, Ravi

doi:10.1016/j.jhazmat.2009.03.024

Cited by 37 publications

(28 citation statements)

References 26 publications

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“…We were unable to find DDT in the decanted solution of the 1st and 2nd rinses. This may be due to partial destruction of the DDT molecules, seen previously with high frequency ultrasound in solution (Thangavadivel et al 2009), volatile losses and the remaining low concentration of the non-polar DDT in SDS. At the low concentration of SDS used, i.e., about 500 mg/L (2,500 mg/L cmc; Paria 2008), micelles are not likely to form in the solution but sub-micelle structures may form at the particle surfaces due to hydrophobic association.…”

Section: The Role Of Sdsmentioning

confidence: 83%

“…Agitation in a Soniclean (Model 250 HT, 330 W, 6 L, 43-45 kHz) ultrasonicator bath (Thangavadivel et al 2009) was used to assist solvent extraction of DDT from the soil (DDT-spiked reference soil samples and soil samples treated using the high-power ultrasonic probe) following US EPA method 3550C. An AVORMix (VM80, 25 W) vortex mixer was used to mix the slurry and dissolve the DDT in the chosen solvent.…”

Section: Equipmentmentioning

confidence: 99%

“…1 Introduction 1,1,1-Trichloro-2,2-bis(p-chlorophenyl) ethane (DDT) is a persistent organic pollutant which was banned by developed countries during the 1970s and was globally banned by the United Nations Environment Program in 2004 (Thangavadivel et al 2009). In Africa and Asia, DDT is currently produced in limited quantities under United Nations' supervision to control malaria (Karstensen et al 2006).…”

mentioning

confidence: 99%

“…Much cheaper iron powder addition has been reported to improve dechlorination of DDT. However, mass transfer limitation makes this process too slow especially for in situ soil application (Thangavadivel et al 2009). …”

mentioning

confidence: 99%

See 3 more Smart Citations

Ultrasonic Enhanced Desorption of DDT from Contaminated Soils

Thangavadivel

Megharaj

Smart

et al. 2010

Water Air Soil Pollut

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In this study, using high-power lowfrequency ultrasound, heated slurries with anionic surfactant sodium dodecyl sulfate (SDS) were treated to enhance desorption of DDT from soils with high clay, silt, and organic matter content and different pH (5.6-8.4). The results were compared with DDT extracted using a strong solvent combination as reference. Slurry ranges from 5 to 20 wt.% were studied. For a soil slurry (10 wt.%) at pH 6.9 with 0.1% v/v SDS surfactant heated to 40°C for 30 min, desorption was above 80% in 30 s using 20 kHz, 932 W/L ultrasonic intensity without solvent extraction. Other soils gave lower desorption efficiency in the range 40-60% after 30 s ultrasonic treatment. The percentage of organic matter, dissolved organic carbon, soil surface area, clay and silt percentage, and soil pH level were the key parameters influencing variations in desorption of DDT in the three soils in similar experimental conditions. DDT dissolution in SDS and soil organic matter removal employing the ultrasonic-enhanced organic matter roll-up mechanism emerged as the two best possible methods of DDT desorption. The method offers a practical, potentially low-cost alternative to high volume, costly, hazardous solvent extraction of DDT.

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Section: The Role Of Sdsmentioning

confidence: 83%

Section: Equipmentmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Ultrasonic Enhanced Desorption of DDT from Contaminated Soils

Thangavadivel

Megharaj

Smart

et al. 2010

Water Air Soil Pollut

Self Cite

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“…오염물이 방향족 탄화수소인 경우, 초음파에 의해 발생하는 공동 현상(cavitation)을 통해 산화 또는 열 분해가 가능한 것으로 알려져 있다 (Flores et al, 2007;Collings et al, 2007;Shrestha et al, 2009;Thangavadivel et al, 2009 (Coleman and Saumders, 1987 …”

Section: 서 론unclassified

Removal Characteristics of Organic Contaminants by Ultrasonic Soil Washing

Lim

Kim²,

Kim³

et al. 2014

Journal of Soil and Groundwater Environment

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Cavitation generated by ultrasonic irradiation can enhance the diffusional transport of organic contaminants from soil surfaces or pores. Therefore, ultrasound soil washing can be an alternative of traditional soil washing process. In this study, soil was artificially contaminated with n-tetradecane, n-hexadecane and phenanthrene. A plate type ultrasonic reactor at 25 kHz frequency and 1000 W power was used for laboratory soil washing experiments. Ultrasonic soil washing efficiency was compared with those of traditional soil washing using mechanical mixing. Various operational parameter such as soil/liquid ratio, irradiation time, particle size, and soil organic matter content was tested to find out the optimum condition. It was found that ultrasonic soil washing demonstrates better performance than mechanical soil washing. Optimum soil:liquid ratio for ultrasonic soil washing was 1 : 5. Desorption of organic contaminants from soils by ultrasonic irradiation was relatively fast and reached equilibrium within 10 minute. However, decrease in the soil particle sizes by ultrasonic irradiation results in re-adsorption of contaminants to soil phase. It was also observed that soil particle size distribution and soil organic matter content have significant effects on the efficiency of ultrasonic soil washing.

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Optimization of Ultrasonication Process for the Degradation of Linear Alkyl Benzene Sulfonic Acid by Response Surface Methodology

Arslan

Topkaya

Veli

et al. 2018

CLEAN Soil Air Water

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The optimization of ultrasonication process applied to linear alkyl benzene sulfonic acid (LABSA) degradation is investigated with response surface methodology in this study. Methylene blue active substance assay is used as a mean to monitor the degradation of LABSA. The effects of independent process variables (initial LABSA concentration, pH, and reaction time) on main material degradation are investigated. Among the independent variables, the greatest effect on LABSA degradation is observed for reaction time. Besides this, the effects of both reaction time and initial LABSA concentration are quite similar. The initial pH value of the solution has a lower effect on degradation performance when compared to other parameters. The predicted maximum detergent degradation was 75% at the optimal conditions of pH 7.8, initial LABSA concentration of 20 mg L−1, and reaction time of 70 min. Specific cost of LABSA degradation by ultrasonic treatment varies from 0.579 to 4.657 Euro g−1 removal LABSA. According to the results of sonication treatment applied to real wastewater, approximately 40% of the LABSA degradation is achieved at three pH values (5.27, 7.50, and 9.59). Because the original pH of the real wastewater is 9.59, it is more feasible to run experiments at this pH value.

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Application of high frequency ultrasound in the destruction of DDT in contaminated sand and water

Cited by 37 publications

References 26 publications

Ultrasonic Enhanced Desorption of DDT from Contaminated Soils

Ultrasonic Enhanced Desorption of DDT from Contaminated Soils

Removal Characteristics of Organic Contaminants by Ultrasonic Soil Washing

Optimization of Ultrasonication Process for the Degradation of Linear Alkyl Benzene Sulfonic Acid by Response Surface Methodology

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