Enhancing the removal of pollutants by an on-stream pond

Abstract

A methodology is presented for assessing the pollution control performance of an on-stream pond located in Kingston, Ontario, Canada, and enhancing the removal of pollutants by remediation techniques., Descriptions are provided of the instrumentation used to measure continuously rainfall and water levels, and the sampling program to collect stormwater samples., The assessment is based on examining contaminant removals for both baseflow and event conditions and applying in-pond remedial measures to improve pond performance., Results on removal rates are provided for selected dissolved constituents (total dissolved solids, sulphate and chloride), nutrients, suspended solids, metals and organic contaminants., In summary, dissolved constituents exhibit zero removal for baseflow periods and positive removal for events; nutrients and suspended solids exhibit negative removal for baseflow periods and positive removal for events; and metals and organics exhibit positive removal for both baseflow periods and events. Remediation techniques are discussed and preliminary results of one technique — internal pond baffles — indicate that extended hydraulic residence times and prevention of flow short-circuiting result in increased particulate settling and associated contaminant removal.

Floating Treatment Wetland influences on the fate of metals in road runoff retention ponds

“…Constructed wetlands and retention ponds are practices widely used to reduce suspended solids and metal concentrations before they reach the environment. Retention basins generally provide limited removal of dissolved contaminants, being more efficient at removing coarse, particulate-attached forms (Van Buren et al, 1996). Vegetated wetlands provide removal mechanisms for soluble pollutants and those associated with finer particles (Bavor et al, 2001); however, they usually require larger areas and will not tolerate extended periods of high water levels.…”

Wind effects on retention time in highway ponds

“…the pond bathymetric and geometry e.g. Van Buren (1996); Matthews et al (1997); Walker (1998). The wind-induced flows in these shallow ponds may potentially exceed the size of the inflow and outflow generated currents.…”

Optimization of pollution control performance of wet detention ponds in tropical urban catchments using particle swarm optimization

“…It is important during hydrologie design of wet detention ponds to target the detention time that gives the highest pollution control in order to maximize the removal of TSS from the urban stormwater. Hydraulic considerations also need to be to be given due consideration during design of the facility (Buren et al 1996;Persson 2000). …”