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<br />25~1 <br /> <br />April 1946 of the contract which had been in effect since 1941 for <br />purchase of commercial lime, procurement of this commodity be- <br />came difficult because demands for building construction and in- <br />dustry had outgrown production, No bids were received under <br />specifications advertised in March 1946 for lime to be delivered <br />during the ensuing twelve months. The .tudies indicate a sub- <br />stantial saving in cost of reclaimed lime compared with probable <br />future prices for the commercial product, and in addition the <br />calcining of the sludge will obviate the necessity for disposing of <br />it by tbe present lagooning method. <br /> <br />METROPOLITAN WATER DISTRICT <br /> <br />Wa"te wa,ter disposal <br /> <br />Studies were made in connection with future disposal of wa.te <br />brine from the softening plant. The present arrangement involv- <br />ing discharge from the District waste water pipe line extending <br />to Whittier Narrows, of not exceeding 4 cubic feet per second into <br />the sewer system of the Los Angeles County Sanitation Districts, <br />will become inadequate upon completion of the first expansion of <br />the softening and filtration plant, Negotiation with the Sanitation <br />Districts, which are undertaking construction of a new trunk sewer <br />from Whittier Narrows to the sewage treatment plant near Lomita, <br />has resulted in a tentative understanding that the District, through <br />a capital contribution toward the trunk sewer cost, will acquire a <br />perpetual right to discharge 25 cubic feet per second into the line, <br />This would suffice for waste brine disposal from the ultimate <br />softening plant. <br /> <br />Electmtytic softening proce..s <br /> <br />Small-scale experiments in softening water by the electrolytic <br />process have been conducted during previous years at the softening <br />plant development laboratory. Controlled reduction in mineral <br />content can be accomplished by this method, making possible a <br />finished water superior in certain respects, particularly for indus. <br />trial purposes, to the water produced by the zeolite process in use <br />at the plant, Results of the experimentation bave been sufficiently <br />significant to justify construction of a pilot plant of ample size to <br />furnish reliable evidence as to power consumption in plant-scale <br />operations. Designs were prepared for the electrolytic cell and <br />appurtenant features of the pilot plHnt.. Proc-lIrement of materials <br />and construction of the pilot plant is scheduled for the succeedin!: <br />fiscal year. <br />