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ASSESSMENT OF AN INNOVATIVE TECHNOLOGY TO REDUCE
SEDIMENT AND IMPROVE WATER QUALITY IN A STORMWATER POND Laursen,A.1,Ulhaq,S.2,Bostan,V.1andMar9n.D2.1RyersonUniversity.DepartmentofChemistryandBiology.Toronto,Ontario2WCIEnvironmentalSolu9onsInc.OJawa,Ontario.
ABSTRACT WCIEnvironmental Solu9ons Inc., TorontoWater andRyersonUniversitypartnered to complete a12-weekpilotproject to assess changes in sediment andwaterqualityusingWCI’s EOS-2000at the LowerDuckstormwater (SWMP) reten9onpond inHighPark,Toronto.TheEOS-2000operated fromSeptember11,2015 toDecember3,2015.TheEOS-2000 is solar-powered,mobileand requiresno infrastructure.Ryersonmonitoredforonemonthpre-installa9onandthroughouttheproject.Dissolvedoxygen(DO)increasedrapidlyatinstalla9onandstayedabovehistoricalvaluesoverthetreatmentperiod.Oxygensatura9onsurpassed100%.Theoxida9onreduc9onpoten9al(ORP)increasedsharplyatstartandremainedhighandstablethereaZer.Aerobicbacteriacountsincreased1000fold.Waterclarityimprovedby68cm(218%)andchlorophyllareducedby87%.Between14–23cm(7.9%–12.6%)ofsedimentwasdigestedinonly3months.UsingtheEOS-2000withinaSWMPcouldbeaninnova9veandcost-effec9vealterna9vethatiscapableofrejuvena9ng/extendingthelifeofaSWMPby8-12monthsandinthisprojectdemonstrateddredgingcostsavingsof$55,000to$360,000(dependingonclassifica9onofbio-solidsremoved).
INTRODUCTION Redox poten9al (ORP) is an important determinant of biological process-Highredoxpoten9alincreasesefficiencyofcarbonmetabolismDissolvedoxygen(DO)isanimportantcontributortoredoxpoten9al(ORP)-Aerobicrespira9onisthemostefficientpathwayofcarbonmetabolismRelevanceàapondthatsupportshighratesofcarbonmetabolisminsedimentwillaccumulatesedimentmoreslowlyastheorganiccarbonismineralizedtoCO2Technology that increases redox, par9cularly DO, can enhance net respira9on in apondandsloworreversetheaccumula9onofsedimentsGoalàreducethefrequencyofdredgingtherebyreducingmaintenancecosts
OBJECTIVES 1. DeterminetheeffectoftreatmentbytheEOS-2000onDOandDOsatura9on
2. DetermineresponsetoincreasedDOandredoxpoten9albyaerobicbacteriainsediments
Ø Using#ofac9veheterotrophicbacteriaasproxy
3. Quan9fysedimentdepthover9metodetermineifthereisaresponsetotreatmenti.e.diges9onduetoincreasedaerobicbacteria
4. Assessesthe9cwaterqualitythroughclarityimprovementusingchlorophyllaandsecchidisc
Pre-installa9on Week1 Week2 Week3 Week4 Week6 Week8 Week12 Sept1 Sept
10Sept17 Sept24 Oct1 Oct8 Oct22 Nov5 Dec3
O2,Temp X Con9nuousfromSept14ORP,pH,cond X X X X X X X X XSecchidepth X X X X X X X X XChlorophyll X X X X X X X XBacterialplatecounts X X X X X X X XNutrients(w&s) X X X X X X X XSedimentmapping X X X XContaminants(sed) X X
RESULTS • EOS-2000rapidlyincreasedDO(2à8mg/L)andORPaZerinstalla9on;s9mulatedaerobic
respira9oninsediments• 14-23cmofsludgereduc9on
Ø Ini9aldepth183cm(es9matedvol14,823m3)Ø Es9matedsedimentloss1,175m3–1,863m3(7.9%to12.6%)inonly3months
• Aerobicbacteriacountincreasedby2-3ordersofmagnitude• Waterclaritygreatlyimproved(218%)• Resultofenhancedrespira9onisreduc9onofsedimentorganicmaJer–rollingbackpond
maintenance
Table1:Datacollec.onschedule
Objec.ve4:WaterClarity
Objec.ve3:Sedimentreduc.on
Objec.ve1:DOSatura.on
Objec.ve2:Redoxpoten.alandAerobicbacterialcounts