The removal of urban pollutants by constructed wetlands during wet weather

摘要: The Environment Agency for England and Wales has developed urban runoff treatment wetlands at two selected sites in Outer London. systems were monitored a range of determinands including heavy metals, suspended solids BOD. Initial analysis the data indicates that during dry weather, removal efficiencies vary greatly. However, storm events are higher with mean values 71% Zn, 72% Cd, 69% Pb, 66% Cu, 34% Ni 81% Cr Dagenham wetland. Mean 20% 40% 36% 38% conditions Brentwood wetland, but an overall increase Zn was measured. Removal BOD greater both 24% 29% Brentwood, respectively. Suspended reduced on passing through but, there is increase. metal capability microorganisms isolated from rhizosphere Typha latifolia Phragmites australis being investigated. Laboratory experiments assessing efficiency tolerant strains to accumulate Pb Zn. It believed this ability may prove be important year-round pollutant process by constructed wetland systems, preliminary presented.