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Abstract
ABSTRACTLaboratory work to improve the performance of storm‐water separators, to meet new Environment Agency and European standards, is described in this paper. Residence‐time distribution testing, using particulate and dissolved tracers, was used to study the hydraulics of separation. Oil‐separation efficiency and head‐loss analysis was used to develop additional final coalescing filters to reduce oil concentrations in the discharge to less than 5 mg/l. Field tests found lower oil, but greater metal, concentrations in runoff compared with those previously reported. It is suggested that improved separators could provide part of a multi‐barrier design to improve the sustainability of removal of priority pollutants in highway runoff.
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