Predicted effectiveness of in-situ activated carbon amendment for field sediment sites with variable site- and compound-specific characteristics

JOURNAL OF HAZARDOUS MATERIALS

卷:301

Article

Choi, Yongju¹  Cho, Yeo-Myoung²  Luthy, Richard G.²  Werner, David³ 

[1] Seoul Natl Univ, Dept Civil & Environm Engn, Seoul 151744, South Korea

[2] Stanford Univ, Dept Civil & Environm Engn, Stanford, CA 94305 USA

[3] Newcastle Univ, Sch Civil Engn & Geosci, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

关键词: Activated carbon amendment;    Mass transfer model;    Sediment remediation;    In-situ treatment;    Hydrophobic organic contaminants;   

DOI  :  10.1016/j.jhazmat.2015.09.016

来源: Elsevier

【 摘 要 】

A growing body of evidence shows that the effectiveness of in-situ activated carbon (AC) amendment to treat hydrophobic organic contaminants (HOCs) in sediments can be reliably predicted using a mass transfer modeling approach. This study analyzes available field data for characterizing AC-sediment distribution after mechanical mixing of AC into sediment. Those distributions are used to develop an HOC mass transfer model that accounts for plausible heterogeneities resulting from mixing of AC into sediment. The model is applied to ten field sites in the U.S. and Europe with 2-3 representative HOCs from each.site using site- and HOC-specific model parameters collected from the literature. The model predicts that the AC amendment reduces the pore-water HOC concentrations by more than 95% fifteen years after AC deployment for 18 of the 25 total simulated cases when the AC is applied at doses of 1.5 times sediment total organic carbon content with an upper limit of 5 dry wa. The predicted effectiveness shows negative correlation with the HOC octanol-water partitioning coefficients and the sediment-water distribution coefficients, and positive correlation with the effectiveness calculated based on equilibrium coefficients of sediment and AC, suggesting the possibility for use of the values for screening-level assessments. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free