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Road deposited sediments are polluted by various substances like organics, heavy metals and polycyclic aromatic hydrocarbons (PAHs) in site-specific contents. During rain events, a considerable amount of pollutants with storm water runoff... more
Road deposited sediments are polluted by various substances like organics, heavy metals and polycyclic aromatic hydrocarbons (PAHs) in site-specific contents. During rain events, a considerable amount of pollutants with storm water runoff are transport as sediment-bound contaminants to receiving watersheds. It is crucial to have a clear understanding of the particle size distribution on street surfaces and the amount of pollutants adhered to various particle sizes to optimize the removal performances of treatment systems. This paper present the results of a study carried out to determine the effect of different site-specific factors on particle size distribution on street surfaces and the amount of organic loads associated with different particle size ranges in road-deposited sediments. Particles were collected from ten different sites with a background of urban pollution and various fixed site characteristics. Particles were collected using dry vacuum cleaning technic and samples were air dried in the laboratory before sieving. Particles first were pre coarse sieved then for particle size distribution analysis subjected for dry and wet sieving with stainless steel vibratory sieving machine for size fraction 40-1000μm. For determination of loss on ignition one gram of particles for each size fraction ignited for two hours in 550°c. The results indicated that particle size range 250-1000μm has the highest abundance in collected road sediments. The results showed site-specific factors like curb height, pavement, and land use have a measurable effect on physical and chemical properties of particles. The load of nutrients in road sediments is under the direct influence of tree’s canopy coverage and surrounding land use. Site-specific factors like maximum car passage speed affect the amount of nutrients on the street surfaces considerably.