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<br />~ J'i i\ <br /> <br />56 METROPOLITAN WATER DISTRICT <br /> <br />cipal items being operating; tables for the filters and zeolite soften- <br />ers, a lime conveyor-elevator, pumping equipment, organic cation <br />exchanger for an operating test in one of the softener units for <br />comparison with the synthetic silicious zeolite, and salt for zeolite <br />regeneration. <br />Several features desired for improving the operatioll of the plant <br />were designed and included under the construction contract as extra <br />work, These included a pump structure equipped with two 400-gpm <br />deep-well pumps for lifting finished water from the main effluent <br />conduit to supply the high tank in the headhouse tower. This in- <br />stallation will afford a reliable and ample supply of finished water <br />for plant operation purposes, replacing two 300-gpm pumps located <br />in the venturi meter van It, maintenance of which had occasioned <br />some difficulty. Another added feature is an access vault with an <br />assembly of easily removable fittings for use in cleHlling out the <br />brine pipe lines extending from the salt storage bas ill>' to the zeolite <br />softener buildings. <br />Several accessory facilities for the plant were designed for <br />installation by District forces. These include (1) a feed tank and <br />piping system for applicatioll of activated silica to the influellt <br />water for coagulation purposes in conjunction with lime softening; <br />(2) a portable transfer pump, 3,OOO-gpm capacity, for unwatering <br />the mixing and settling basins both of the previously existing and <br />the expanded plant; (3) a conveyor for delivering lime from one <br />of the storage bins ill the headhouse to a spout for loading trucks <br />for transfer to the lime hopper in the expanded plant; and (4) a <br />motorized portable conveyor for transporting gravel into and out <br />of the zeolite softener beds. <br />Studies had been made previously alld a portioll of the necessary <br />equipment procured for construction of an experimental pilot plant <br />of 300-gpm capacity for electrolytic softening of water, The pilot <br />plant is to be constructed following completion of the main softening <br />plant expansion when a suitable site can be cleared, Designs for <br />the mechanical and electrical features of the plant were developed <br />in collaboration with the owner of the patents covering the processes <br />involved, The District's use of the patented processes is covered by <br />license agreement, <br /> <br />I <br />I <br />j <br /> <br />~ <br /> <br />lVp.~t B(I$'!"n feeder <br /> <br />West Basin Municipal Water District, originally comprising the <br />cities of EI Segundo, Manhattan Beach, Hermosa Bl'ach, Redondo <br />