Evaluation of enhanced soil washing process and phytoremediation with maize oil, carboxymethyl-β-cyclodextrin, and vetiver grass for the recovery of organochlorin...
Publication Date
2014-08-01Author
Ye, Mao
Sun, Mingming
Liu, Zongtang
Ni, Ni
Chen, Yinwen
Gu, Chengang
Kengara, Fredrick O
Li, Huixin
Jiang, Xin
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Abstract An innovative ex situ soil washing technology was developed in this study to
remediate organochlorine pesticides (OCPs) and heavy metals in a mixed contaminated
site. Elevated temperature (60 C) combined with ultrasonication (40 kHz, 20 min) at 50 mL
L− 1 maize oil and 45 g L− 1 carboxylmethyl-β-cyclodextrin were effective in extracting
pollutants from the soil. After two successive washing cycles, the removal efficiency rates for
total OCPs, mirex, endosulfans, chlordanes, Cd, and Pb were approximately 94.7%, 87.2%,
98.5%, 92.3%, 91.6%, and 87.3%, respectively. Cultivation of vetiver grass and addition of
nutrients for 3 months further degraded 34.7% of the residual total OCPs and partially
restored the microbiological functions of the soil. This result was indicated by the significant
increase in the number, biomass C, N, and functioning diversity of soil microorganisms (p …
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- Department of Chemistry [326]