
OrganicScavengerInstallation,OperationandMaintenanceGuide
Introduction
HowanOrganicScavengerworks
Tanninsareacommonclassoforganiccompoundsinuplandwaterand
givethewaterayellow/browntint.Inhighland(peaty)areaswhere
waterrunsoffpeatthewatercanbevirtuallybrown.Organicscavenging
systemsuseresintoholdtheseorganicswhichareperiodically
backwashedawaywithbrine.Typically,every25litresofresinwilltake
out2000ppmoforganiccolourbeforeitneedsregenerating.
Aneasytestyoucantryathomeistoleaveaglassofthewater
overnight.Ifthecoloursettlestothebottomoftheglassthe
discolourationislikelycausedbyironand/ormanganese.Ifthecolour
remainsthesameitislikelycausedbytannins.
Anorganicscavengerisanionexchangesystemconsists
ofapressurevesselfilledwithresin.Locatedonthetop
ofthepressurevesselisthecontrolvalve.Thewateris
passedthroughthecontrolvalveanddownthroughthe
vessel.Asthewaterpassesacrosstheresinbed,the
colourcompoundsattachtotheresin.Periodically,
dependingonhowmuchwaterisused,theresinneeds
toberefreshed.Thisisdonebyflushingasmallamount
ofsalt(storedinanexternalbrinetank),thoughtheresin
vessel.Oncethisprocesshasbeencompletedtheresinis
refreshedandreadytobeginagain.
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