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<br /> <br />,-. ..... ~ <br /> <br />l.v..\" <br /> <br />\l,:\TEIl ~OFTE\I\G 1'1 '\T <br /> <br />87 <br /> <br /> <br />Columbus, Ohio, was retuincd to advise on the desi!nl. construction, <br />and preliminary operation of the plant. The site chosen was the <br />point of take-out f(no tJu.' Ornng-e County feeder, whieh is near the <br />City of 14\ Verne. about :w miles enst of Los Angeles, <br />The llwthod of soft(,llin~ to he used is known as the lime-zeolite <br />process, Following-extensive experiments made at the water soften. <br />ing plant in Boulder City. :-;evada. which uses Colorado Rh'€l' <br />water. and thoruugh im'(~sti~ration of all modern water treatment <br />method!';, it was :tdoptffi as th(' hest and most economical process <br />applicahlt, to the softening- of Colorado P.ivel' water. The hardness <br />of nattlnd Colorado Uiwr water is due primarily to three com- <br />pounds which aJ'e held in solution. These are {o,akillm bicarbonate <br />causing cnrh(lIlatc hardllt;'ss and ('alcillnJ and m<l.l!nesium sulfates <br />causing 11011c::II"hollate hardness. TIll' (~arhon;\te hardness. in the <br />softening- method adopte<l. is recluced by the addition of lime, the <br />dleapest softening a~t;'nt availahle. All of the water is put throu~~h <br />the plant and lime softened, The noncarbonate harrlness which ran- <br />not be removed with lime is fl'duct'd by passinJ! the water throll~h <br />beds {If zeolite. n sanrllike baRt' ('xchan,gt' mineral. which has the <br />propel1.y of takin)! out of water passinJ! thrOlll!h it the hardness- <br />forming calcium and ma)!nesium. replacing tht'm with nonhardness- <br />forming sodium. As the 7.t'olite lJt'('omes saturated with the calcium <br />and m:tgnesiulll it lost's its softening c:qmcity, Wht'n thus exhausted <br />it is not replaced but is l"('gelwrated by pt'lssing through it a strong <br />solution of sodium dlluride--(:umnwlI $<lIt. TIlt' zeolite-softened <br />water is reduced to zero h.ardnt'Ss. an extent not ecollomic.ally war- <br />rantffi for most domestic IIses. TlH'refore only a pt1l1ion of tht' <br />lime-softened watl'r is p:lsst.d through the 7.eolitt" the zel'O water <br />bein~ rt'Comhilled with the hy-passed wllter in the proper propor- <br />tions to produce the desi,'ed dt',gree of hardness. .-\11 of the softened <br /> <br />~ <br /> <br />~~ <br /> <br />Arrhitrrt".O{ ,<:kd,.h of Mftrninfl all(! ,filtration 111allt <br />