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There are now believed to be more than 1,200 Constructed Wetland systems (CWs) in theUK. The Constructed Wetland Association (CWA) was formed in 1999 by a group ofexperienced, reputable designers and constructors to bring together best UK practice. CWA isnow responsible for a database of design and performance relating to a range of systems (bedtypes and applications), which now contains information from more than 1,000 beds. CWAmembers are encouraged to contribute data to the database, which has been updated 9 timessince it was first created in 1999. Most of these sites treat sewage/domestic wastewater but thedatabase also includes examples of systems for the treatment of minewater, sludge, landfillleachate, industrial effluents, surface runoff and road runoff. Particular treatment applicationsare illustrated by Case Studies, summary articles describing design, construction andperformance, For beds with data on influent and effluent concentrations and flow rates, theuser can fit four alternative models, to derive reaction rate constants (K), enabling somedegree of quantitative comparison of the pollutant reduction performance for different systemdesigns. Access to the database is the main benefit of CWA membership: new members fromoutside UK are welcome (www.constructedwetland.org). |
