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Authors
Affiliations
1 School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, No. 88, West Anning Rd., Lanzhou 730070, CN
Source
Nature Environment and Pollution Technology, Vol 16, No 2 (2017), Pagination: 607-613
Abstract
The remediation of soils co-contaminated with heavy metals (HMs) and hydrophobic organic compounds (HOCs) is urgent. In this paper, the simultaneous removal of phenanthrene and Ni(II) co-contaminants from sandy soil column by 3250 mg/L of Triton X-100 (TX100) and 0.1 mol/L of citric acid (CA) flushing was conducted. The removal effects were compared and discussed when CA after TX100 (TX100/ CA), TX100 after CA (CA/TX100), and a mixture of TX100 and CA (TX100-CA) were used as flushing agents. The maximum concentrations of phenanthrene in effluent solutions appeared when the pore volume number (PVN) of influent was 3, 17.5 and 4 while those of Ni(II) occurred at 12.5, 2 and 2.5 of PVN during TX100/CA, CA/TX100 and TX100-CA flushing, respectively. The total removal efficiencies of phenanthrene were upto 93.7%, 94.5%, and 93.1%, while those of Ni(II) were 80.2%, 80.4% and 80.7% due to TX100/CA, CA/TX100 and TX100-CA flushing, respectively. Larger PVN was required for TX100/CA and CA/TX100 to clean phenanthrene and Ni(II) efficiently. The removal efficiencies of contaminants increased with PVN in Sigmoidal Model. The results showed that flushing using nonionic surfactant and organic acid is promising for in-situ remediation of soils contaminated with HMs and HOCs.
Keywords
Co-Contaminant, Column Flushing, Surfactant, Organic Acid.
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