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Integration of traditional and innovative characterization techniques for flux-based assessment of Dense Non-aqueous Phase Liquid (DNAPL) sites

Basu, Nandita B ; Suresh, P ; Rao, C ; Poyer, Irene C ; Nandy, Subhas ; Mallavarapu, Megharaj ; Naidu, Ravi ; Davis, Greg B ; Patterson, Bradley M ; Annable, Michael D ; Hatfield, Kirk

Journal of Contaminant Hydrology, 2009, Vol.105(3), pp.161-172 [Tạp chí có phản biện]

ISSN: 0169-7722 ; E-ISSN: 1873-6009 ; DOI: 10.1016/j.jconhyd.2008.12.005

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  • Nhan đề:
    Integration of traditional and innovative characterization techniques for flux-based assessment of Dense Non-aqueous Phase Liquid (DNAPL) sites
  • Tác giả: Basu, Nandita B ; Suresh, P ; Rao, C ; Poyer, Irene C ; Nandy, Subhas ; Mallavarapu, Megharaj ; Naidu, Ravi ; Davis, Greg B ; Patterson, Bradley M ; Annable, Michael D ; Hatfield, Kirk
  • Chủ đề: Dnapl Sources ; Dnapl Plumes ; Chlorinated Solvents ; Contaminated Site Remediation ; Groundwater Monitoring ; Contaminant Fluxes ; Contaminant Mass Discharge ; Passive Flux Meters ; On-Line VOC Probes ; Long-Term Stewardship ; Engineering ; Environmental Sciences ; Geography
  • Là 1 phần của: Journal of Contaminant Hydrology, 2009, Vol.105(3), pp.161-172
  • Mô tả: Key attributes of the source zone and the expanding dissolved plume at a trichloroethene (TCE) site in Australia were evaluated using trends in groundwater monitoring data along with data from on-line volatile organic compound (VOC) samplers and passive flux meters (PFMs) deployed in selected wells. These data indicate that: (1) residual TCE source mass in the saturated zone, estimated using two innovative techniques, is small (∼ 10 kg), which is also reflected in small source mass discharge (∼ 3 g/day); (2) the plume is disconnecting, based on TCE concentration contours and TCE fluxes in wells along a longitudinal transect; (3) there is minimal biodegradation, based on TCE mass discharge of ∼ 6 g/day at a plume control plane ∼ 175 m from source, which is also consistent with aerobic geochemical conditions observed in the plume; and (4) residual TCE in the vadose zone provides episodic inputs of TCE mass to the plume during infiltration/recharge events. TCE flux data also suggest that the small residual TCE source mass is present in the low-permeability zones, thus making source treatment difficult. Our analysis, based on a synthesis of the archived data and new data, suggests that source treatment is unwarranted, and that containment of the large TCE plume (∼ 1.2 km long, ∼ 0.3 km wide; 17 m deep; ∼ 2000–2500 kg TCE mass) or institutional controls, along with a long-term flux monitoring program, might be necessary. The flux-based site management approach outlined in this paper provides a novel way of looking beyond the complexities of groundwater contamination in heterogeneous domains, to make intelligent and informed site decisions based on strategic measurement of the appropriate metrics.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0169-7722 ; E-ISSN: 1873-6009 ; DOI: 10.1016/j.jconhyd.2008.12.005

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