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<br />(1'-('"-5 <br />(; l.. .:: C J <br /> <br />EXISTING PARTIAL LIME SOFTENING ALUM PROCESS <br />Reduces total dissolved solids Reduces total dissolved <br />by 13 percent . solids by 5 percent. <br />Requires acid to adjust pH No pH adjustment required <br />Large sludge volume and higher About 50 percent less sludge <br />lined landfill disposal costs volume and less landfill <br /> disposal costs . <br />Removes calcium, bicarbonate <br />producing softer water. <br />Increases longevity of hot water <br />heaters and other appliances . <br />Removes taste & odor. Some removal of taste and <br />Reduces the consumption of soap . odor . <br />Decreases salinity level of <br />sewage effluent and would help <br />to meet future NPDES discharge <br />requirements . <br />Would likely decrease the use of Yuma residents will likely <br />home water softeners resulting continue to use home water <br />in further decrease of sewage softeners . <br />salinity. <br /> .. Operating Costs <br /> $ per acre-foot <br /> .//i Chlorine 0 . 88 <br /> Aluminum Sulfate 1 . 22 <br /> .< Polymer 1 . 67 <br />~;~g~~~~~~~~I"~~~Hi Disposal Pond 2 . 91 <br /> Maint . Labor 0.90 <br /> TOTAL 7 . 58 <br />. .. '",',--'-.' --,' -.. <br />:.. . .,i' "ii". , <br /> Operating Costs operating Costs <br /> Cents per 1000 gallons Cents per 1000 gallons <br /> 6 . 94 2 . 33 <br /> Coagulation with alum can be <br /> acco!ll1llodated without later <br /> impacting the partial lime <br /> softening and Reverse <br /> Osmosis process . <br /> <br />TABLE 3 <br />COMPARISON OF <br />PARTIAL LIME SOFTENING VERSUS ALUM PROCESS <br />FOR TREATING COLORADO RIVER WATER <br /> <br />-\ <br /> <br />..) <br /> <br />19 <br />