| Title: | Organic contaminated sediments remediation with active caps: Nonlinear adsorption unveiled by combined isotherm and column transportation studies |
| Author(s): | Yin K; Viana PZ; Rockne KJ; |
| Address: | "Residues and Resource Reclamation Centre (R3C), Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, Singapore, 637141, Singapore. Arcadis, 320 Commerce Suite 200, Irvine, CA, 92602, USA. Dept. of Civil and Materials Engineering, 3077 Engineering Research Facility, Univ. of Illinois at Chicago, 842 West Taylor St., M/C 246, Chicago, IL 60607-7023, USA. Electronic address: krockne@uic.edu" |
| DOI: | 10.1016/j.chemosphere.2018.09.122 |
| ISSN/ISBN: | 1879-1298 (Electronic) 0045-6535 (Linking) |
| Abstract: | "Bench-scale column studies were performed with four cap materials (sand, apatite, organoclay and granular activated carbon) for five target compounds (toluene, naphthalene, phenanthrene, pyrene and dichlorobiphenyl) to represent a range of cap materials and pollutants (volatile & semi-volatile compounds) commonly found in sediments. Two moment-derived methods were used to model cap performance. Rough agreement was observed between the column experiments and modeling data with the fronting and tailing effects identified from certain breakthrough curves indicating a high potential of non-linear adsorption. Distribution coefficients (k(d)) were experimentally determined with isotherm studies together with measurements of surface area and microporosity of the cap materials via nitrogen adsorption porisimetry. These studies unveiled the occurrence of nonlinear adsorption by Freundlich simulation. The effects of nonlinear adsorption of the cap were further explored via modeling. Results suggested better prediction of cap performance assuming nonlinear adsorption instead of linear adsorption results based upon the risk of release for a 30-year period" |
| Keywords: | Adsorption Apatites/*chemistry Charcoal/*chemistry *Environmental Restoration and Remediation Geologic Sediments/*chemistry Organic Chemicals/chemistry/*isolation & purification Soil/*chemistry Soil Pollutants/chemistry/*isolation & purification Thermodyn; |
| Notes: | "MedlineYin, Ke Viana, Priscilla Z Rockne, Karl J eng England 2018/10/08 Chemosphere. 2019 Jan; 214:710-718. doi: 10.1016/j.chemosphere.2018.09.122. Epub 2018 Sep 26" |
