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- W2013669682 abstract "Non Point Source (NPS) pollution is considered a major cause of water qualitydeterioration around the globe. A study was conducted to assess the efficiency of a constructedwetland for sediment and nutrient removal from a riverine source containing NPS pollution in aNordic climate. The constructed wetland, built near the town of Mystic, Quebec, consists of asedimentation basin, a sinuous subsurface horizontal flow section and an open water body or pondthat continuously receives up to 2.5% of the Walbridge Creek. The plants grown in the wetland arecomposed of several indigenous emergent aquatic species. Flow into and through the system is controlled by gravity. There is a gate on the intake structure, which allows flow to be adjusted, alongwith three composite weirs; located at the outlet of each section of the wetland. Water levels at theweirs are monitored continually using submersible pressure transducers and ultrasonic sensors.There are five sampling sites: one located in the river, at the inlet of the wetland, weir 1, weir 2, andweir 3. Grab samples are taken at least once a week and more frequently when storm eventsoccurred. Automated samplers are also used to take composite samples during storm events.Sampling will span a two year time period, winters excluded. The water samples are analyzed fororthophosphates, dissolved phosphorus, organic phosphorus, nitrates, ammonia, dissolved nitrogen,and total suspended solids. A subset of the samples are analyzed in an external laboratory for anadditional suite of parameters, including bioavailable phosphorus, total suspended solids, K, Ca, Mg,Na, and pH. From these results mass balances for the sediments and nutrients and nutrient removalefficiencies for the entire system and each of the components will be evaluated. Most of thereduction in 2003 occured during the spring and summer months. From the internal data weobserved a 43.8% reduction in the median annual orthophosphate concentrations and a 22.4%reduction in the median annual total P concentrations. From the external data we observed a 47.5%reduction in the median annual orthophosphate, 14% reduction in the median annual total P and37.8% reduction of the median annual bioavailable P concentrations. From these values (internaland external data sets) the wetland appears to be efficient in reducing mean annual phosphorusconcentrations." @default.
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- W2013669682 date "2004-01-01" @default.
- W2013669682 modified "2023-09-25" @default.
- W2013669682 title "Sediment and Nutrient Removal Efficiencies in a Constructed Wetland in Southern Quebec" @default.
- W2013669682 doi "https://doi.org/10.13031/2013.16386" @default.
- W2013669682 hasPublicationYear "2004" @default.
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