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<br />< <br /> <br />. <br /> <br />lSElJO <br /> <br />TABLE 2 Continued <br />SignifiC8Jlce of Common Impuri tie. Affecting W.ter for Dc....tic & Indu.trial Use <br /> <br /> CllEIIICAL CLASS OF DIFFICULTY CA~~ BY ITS UllIT PROCESS OR COr.;MON Il&ANS <br />NAME FOIlMlJLAll 30LIllS PRESEN OF REIIJV AL SPEXlIAL REMARKS <br />IIydrog.n Sulfide lI:1S Dissolved Imperts odor end taste. !&ly Aeretion - ahlorination Found principally in ground waters <br /> Ga. impert color. Interferes and polluted surface streams. <br /> with process .ark. Causes <br /> corrosion of metals. <br /><>x;yg.n 02(EJ:pr- Dissolved ! Causes corrosion and pitting Mechanical deaeration. <br /> eased 8.09 G.. ; (8. speol:f"ic form or Chemical treatment with <br /> o in de- ' corro.ion) in boilers. sodium suli'ite, <br /> ;~~~- ! <br /> i <br />Calcium BicarbonDtes Co.(HC03)2 Di..olved ! Impart. ""rbonate hardn.... Lime process, base exchange Formerly referred to as temporary <br /> I Scaling of boiler.. Producea processes, heat. hardness. The hardness of almost <br />Magnesium Bioarbonates IIgCHC03)2 Di..olved! inaolubl. curd. in wa.hing. I all water supplies 1s due to four <br /> , mineral compounds which are beld <br /> , , <br /> , in solution: calcium, bicarbonate" <br /> i I I magnesium bicarbonate, calcium <br /> , -"-~e+- __. u".. <br />Calcium Sulphate I Caso4 ! bs.rdnessJ Lime-soda process bBa8 Formerly referred to as permanent <br /> Dissolved: Imparts non-carbonate <br /> ! Seeling of boiler.. Produce s ! exchange processes hardnoss. Chlorides and nitrates <br />lBgneaium Sulphate I MgSD4 Di..olved ! UDsoluble aurda in 1I'ashing. I of calcium and magneslUD1 are <br /> I <br /> , Magnesium BaIts TIJBY cause I sometimes also present. <br /> , : <br /> , <br />SUica , Si02 1 Causes extremely hard .""le in ' Colloid.l .ilica - co.gulation <br />(Sodium Sili""te) i , bailers. and f'11t.ration. Dissolved. <br /> ! <br /> , Colloidal ! .Uioo - external chemical <br /> If~Si03 DiSBolvea.t removal in the hot by meeDS <br /> o~,:'ee~~:"" QXi~~~,"in the <br /> , no r~i n "" <br />Iron F. ~ Causes discoloration of Aeration and filtration. So... Iron Is present in ground "ater <br /> , <br /> Di..olved I water and atain. plumbing base exchange softening B8 ferrous bioarbonate. When <br />Manganese IIg j and ..hi te good s. Imparts processes--l1me soda softening oxygen Is available this is <br /> t taste. Causes rlepoal ts in I pH adjustment and filtration. oharged to ferric hydrOXide <br /> ; ~,l:~;~harmful to many i :~;~ 1. in.oluble end precipat- <br /> 1 us Is1 use~- <br />Acid. 1I:zS04 Di.aolved. ;CaUS8S corrosion. In exc.es- I Neutralization with alkalie. !Presence is usuolly due to <br /> , <br />Sulf'u:ric i ai"" quantitie., harmful to ! contamination b,y trade wastes. <br />Hydrochloric HOl I Dissolved , human, animal, and fish11fe. , <br /> i , , <br /> \ i <br /> , ~25 , I <br /> , <br /> I I I : <br />