title: Adsorption experiment of toxic micro-pollutants derived from automobiles using red soil.
abstract: In some countries, non-point source pollution derived from a city's economic activities tends to be a barrier to the improvement of water quality. Roadway runoff is known to contain toxic micro-pollutants such as polycyclic aromatic hydrocarbons (PAHs). Conversely, red soil is known to adsorb some organic matter. In this study, artificial roadway runoff water containing toxic micro-pollutants was made using roadway dust collected from a highway, and used for both batch-type tests and soil column tests with red soil in order to understand adsorption ability of the red soil on such toxic micro-pollutants, especially PAHs. In the batch-type tests, PAHs could be removed by approximately 40% when the contact time was 90 minutes. In the soil column tests, PAHs were removed by more than 80% while suspended solids were removed by more than 90%. Notably, PAHs with a high molecular weight were removed more readily in the tests than PAHs with a low molecular weight.
authors.affiliation: Department of Environmental Systems Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan E-mail: a-ichiki@se.ritsumei.ac.jp.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Kawai
authors.affiliation: Department of Environmental Systems Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan E-mail: a-ichiki@se.ritsumei.ac.jp.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Ichiki
authors.affiliation: CTI Engineering Co., Ltd, Osaka, Japan.
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Sawada
mesh_terms: D000327:Adsorption; D001336:Automobiles; D002947:Cities; D015386:Hazardous Substances / Q000737:chemistry; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry; D012987:Soil / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D015386:Hazardous Substances; D011084:Polycyclic Aromatic Hydrocarbons; D012987:Soil; D014874:Water Pollutants, Chemical