Simultaneous removal of PCDD/Fs, pentachlorophenol and mercury from contaminated soil

Chemosphere
Pao Chen HungMoo Been Chang

Abstract

Pentachlorophenol (PCP), polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), and mercury were simultaneously removed from heavily contaminated soil using a continuous pilot-scale thermal system (CPTS). Operating the system at 700 °C with 22 min of retention time ensured that the residual contaminants in remediated soil are lower in concentration than the soil standards of Taiwan EPA require. Both PCP and PCDD/Fs are effectively destroyed during the treatment at high temperatures in the CPTS, but significant dechlorination of PCDD/Fs is also found, resulting in lower net destruction efficiencies of TCDD/F and PeCDD/F-congeners, compared with those of highly chlorinated Hx-, Hp- and OCDD/F congeners. Moreover, 2,3,7,8-TetraCDD is significantly formed if the retention time is not long enough for total destruction. Inadequate reaction time (or retention time) even may lead to a rise in TEQ-value due to incomplete dechlorination. Mercury is significantly desorbed from contaminated soil and discharged through the exhaust. For PCP and PCDD/Fs, the exhaust discharge percentages including both the remediated soil and the exhaust are <0.03% and 1.14% of the input, respectively, achieved with 700 °C and 33 min retention time. I...Continue Reading

References

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May 30, 2013·Chemosphere·Pao Chen HungMoo Been Chang

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Citations

Jul 28, 2016·The Science of the Total Environment·Yuxiong HuangArturo A Keller
Apr 19, 2016·Chemosphere·Mei-Chen LiuMoo-Been Chang
Oct 21, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Weihua WangPing Li
Feb 18, 2020·Environmental Science and Pollution Research International·Lilian Rodrigues Rosa SouzaMárcia Andreia Mesquita Silva da Veiga
May 30, 2020·International Journal of Environmental Research and Public Health·Ling-Sai ChangHo-Chang Kuo
Nov 6, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Weihua WangPing Li

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