Removal of rubber, bitumen and other microplastic particles from stormwater by a gross pollutant trap - bioretention treatment train

• The removal of microplastics by a stormwater treatment train was evaluated. There an abundance in the highway runoff. Rubber and bitumen particles predominated identified microplastics. A gross pollutant trap found to be inefficient at removing Both vegetated sand-only filter efficiently removed Microplastic pose significant threats environment. This study investigated how effective rubber, other (incl. fibers, fragments, paint particles) 100–300 µm >300 size fractions from two trains comprise (GPT) followed either bioretention cell or non-vegetated sand filter. Flow-proportional composite samples were taken runoff, GPT outflow parallel filters during nine rain events determine overall performance, as well performance individual system components. microplastic mainly represented fraction included high ratios rubber (30%) (60%). Overall, stormwater. cells accounted for major share this removal, did not reduce particle concentrations. observation is likely explained fact that have density close water thus sedimentation decreased. inherent weakness system; more specifically, concentrations surface means there can risk release through overflow pits when inflows surpass capacity. Despite some differences, both similar extent.