SPECIAL FEATURE


drain TRADER


This grossly polluted outfall takes runofffromamajor highway and carpark inWiganGreaterManchester and discharges into a sensitive watercourse


“But the EnvironmentAgencydoesnot routinelymonitor for copper, zinc andbenzo[a]pyrenedownstreamofhighwayoutfalls, sothe pollutiongoesunchecked.There aremore thanonemilliondischargesof highway runoffacross theUKandHighways Englandhas identified 2,500high-riskpollutionlocations aspartof itsongoingPriorityOutfall Programme. “The locationsofmany likelypollutedwaterways are alreadywell documented.While somehavebeenfixed,manymore arenot currently beingactioned.More still arenot yet identifiedordocumented. “TheUniversityofPortsmouthteamsuggests thatmeasures areneeded tocapture tyreparticles at the roadside, andthisfitswellwiththe conceptof SustainableDrainage Systems (SuDS) tocontrolpollutionat source. Theseoutfalls areneither toodifficult, costly,nor complex to tackle.We alreadyhaveboththe knowledge andthe techniques to intercept tyremicroplasticsbefore theypolluteourwater environments. “TheHighways EnglandDesignManual forRoads&Bridges andthe CIRIASuDSManualC753bothdetailmanufactureddevices and sustainabledrainage components that canreduce thispollution. “Filterdrains retainsuspendedsolids inthe spacesbetweenthe stones. Innovativenewengineeredmedia canbe addedtofilterdrains to capturedissolvedheavymetals. Sedimentationdevices suchas vortex separators,oilwater separators, SuDSponds andbasinswill remove tyre particles.Unlike the simple sumpswidely installedinroads across the country, theywillprevent the sediment frombeingwashedoutwhenit rains. The solutiondependsonthe site; especially athighrisk locations, a management trainof treatmentdevices is advisable tokeeppersistent bio-accumulative chemicalsoutof the environment.


50 drain TRADER | July 2020 | www.draintraderltd.com


“Newsmart sensingandremotemonitoringtechnologies arenowalso beingdevelopedthat canmeasure thedepositedsediment ingullypots andvortex separators sothatmaintenance is targetedandcosts minimised. “More empirical evidence followingonfromthisgroundbreakingstudy might addfurtherweight tothe argument ina fewyears’time andSuDS devicemanufacturers, includingSDS,willgladlyworkwithDefraonthe best available anddevelopingtechnologies. Butour aquatichabitats needtobeprotectednow,or some speciesmighthavedisappearedby the time anyonegets aroundtofixingthepollution.”


• SDS is amarket-leading sustainable drainagemanufacturer in the UK. SDS-Aqua-XchangeTMis a sustainable drainage materialwhich turns roadside filter drains into treatment devices that capture copper and zinc pollution. Added to filter drains, a layer of SDS Aqua-Xchange™ engineeredmedia uses the processes of adsorption and ionic exchange to capture and retain themetals dissolved in the runoff as they filter through thematerial.


• SDS Aqua-Swirl™ is a vortex separator alreadywidely used and proven to capture suspended solids in road runoffwhere high pollutant loads are expected. For evenmore challenging sites, the SDS Aqua-FilterTMcombines the vortex separationwith filtration of stormwater to deliver reliable removal of suspended solids and soluble pollutants together.


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