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Article

Remediation Efficiency of the In Situ Vitrification Method at an Unidentified-Waste and Groundwater Treatment Site

1
Department of Technology Management, Open University of Kaohsiung, Kaohsiung 806, Taiwan
2
College of Maritime, National Kaohsiung University of Science and Technology, Kaohsiung 811, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editors: Yingxin Zhao and Thomas Helmer Pedersen
Water 2021, 13(24), 3594; https://doi.org/10.3390/w13243594
Received: 27 October 2021 / Revised: 1 December 2021 / Accepted: 10 December 2021 / Published: 14 December 2021
(This article belongs to the Special Issue New Technology Development for Wastewater and Solid Waste Treatment)
The subject of this study was the dust collected from an electric arc furnace at an unidentified-waste treatment site in southern Taiwan. The dust underwent an in situ vitrification (ISV) process and was tested using the toxicity characteristic leaching procedure (TCLP), at the end of which the final product was analyzed for its stability and weather resistance. This study then examined the above results to determine whether the ISV process helps to enhance the efficiency and economic benefits of said waste-treatment site. A TCLP test conducted on the dust that had been treated with ISV revealed that concentrations of various heavy metals were not only far below those of the unprocessed sample dust but also fell below the limit stipulated in the TCLP regulation of Taiwan’s Environmental Protection Administration. The results show that after undergoing ISV treatment, heavy metals in the dust were either encapsulated or bound in silicon lattices and thus barely leached from the dust. Analyses using scanning electron microscopy (SEM) and an energy dispersive spectrometry (EDS) indicate that the surface of the dust appeared more compacted after going through the ISV process. In addition, the highly contaminated dust that underwent ISV treatment saw a pronounced decrease in or elimination of wave crests. Another analysis applying X-ray diffraction (XRD) showed that the SiO2 crests disappeared in the processed dust, suggesting that the crystal structure was replaced with quasi-vitreous products after ISV treatment. In the event that pollutants were extant, they were usually characterized by smaller size, high stability, excellent weather resistance, an innocuous nature, and recyclability. View Full-Text
Keywords: in situ vitrification; TCLP; electric arc furnace; dust in situ vitrification; TCLP; electric arc furnace; dust
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MDPI and ACS Style

Kuo, S.-L.; Wu, E.M.-Y. Remediation Efficiency of the In Situ Vitrification Method at an Unidentified-Waste and Groundwater Treatment Site. Water 2021, 13, 3594. https://doi.org/10.3390/w13243594

AMA Style

Kuo S-L, Wu EM-Y. Remediation Efficiency of the In Situ Vitrification Method at an Unidentified-Waste and Groundwater Treatment Site. Water. 2021; 13(24):3594. https://doi.org/10.3390/w13243594

Chicago/Turabian Style

Kuo, Shu-Lung, and Edward M.-Y. Wu. 2021. "Remediation Efficiency of the In Situ Vitrification Method at an Unidentified-Waste and Groundwater Treatment Site" Water 13, no. 24: 3594. https://doi.org/10.3390/w13243594

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