URBAN RUNOFF POLLUTANT SURVEY AND SWMM SIMULATION IN VIENTIANE CAPITAL, LAO PDR

摘要

This study is highlighted to survey changes of pollutant in runoff water from a core urban area of Vientiane City, Lao PDR during dry and rainy seasons, and to simulate the runoff pollutant by using SWMM simulation model. Hong Thong catchment area was selected for sampling during wet and dry weather. As a result of the surveys, mean concentration of SS was higher in a rainy season, in contrast, COD, TN and TP were much higher in a dry season possibly due to being associated with domestic wastewater and attenuation by stormwater in a rainy season. The mean total PAHs concentration values were 230.13, 132.83 and 143.72ng/L respectively for a rainy season wet and dry periods, and a dry season. In addition, the pollutant runoff from the catchment area was simulated using SWMM, and the runoff characteristics were shown.