TAILIEUCHUNG - The fate of stormwater-associated bacteria in constructed wetland and water pollution control pond systems

Describing the very active Swiss programme, G. Müller outlined in detail the key contributions. They include the World Calibration Centre for Ozone, Carbon Monoxide and Methane, the QA/SAC Switzerland, and the World Optical Depth Research and Calibration Centre. Mr Müller, the Rapporteur on Strategic Planning and Implementation of GAW, has led the effort to produce the GAW Strategic Plan (GAW Report No. 142). He pointed out that Swiss scientists have been active in assisting with the establishment of the Nairobi ozonesonde measurements and the Mount Kenya Global station. Further, the DACH project that links the. | Journal of Applied Microbiology 2000 89 349-360 The fate of stormwater-associated bacteria in constructed wetland and water pollution control pond systems . Davies and . Bavor Water Research Laboratory Centre for Water and Environmental Technology University of Western Sydney - Hawkesbury Richmond NSW 2753 Australia 147 1 2000 received 21 January 2000 revised 7 April 2000 and accepted 12 April 2000 . DAVIES AND . BAVOR. 2000. The performances of a constructed wetland and a water pollution control pond were compared in terms of their abilities to reduce stormwater bacterial loads to recreational waters. Concentrations of thermotolerant coliforms enterococci and heterotrophic bacteria were determined in inflow and outflow samples collected from each system over a 6-month period. Bacterial removal was significantly less effective in the water pollution control pond than in the constructed wetland. This was attributed to the inability of the pond system to retain the fine clay particles 2 mm to which the bacteria were predominantly adsorbed. Sediment microcosm survival studies showed that the persistence of thermotolerant coliforms was greater in the pond sediments than in the wetland sediments and that predation was a major factor influencing bacterial survival. The key to greater bacterial longevity in the pond sediments appeared to be the adsorption of bacteria to ne particles which protected them from predators. These observations may signi cantly affect the choice of treatment system for effective stormwater management. INTRODUCTION Stormwater refers to the excess rainwater that is unable to infiltrate into the ground. Urbanization leads to an increase in areas of impermeable surfaces such as roads driveways and parking areas and a decrease in areas that are available for percolation and in ltration of stormwater. Urban stormwater carries significant quantities of debris and pollutants that include litter oils heavy metals sediment nutrients organic .

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