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<br />W <br />"-l <br />~ <br />0' <br /> <br />AIR AND VAPOR OUT <br /> <br /> <br />CIR UlATlNG COOLING WATER NOT <br />OPEN lOOP <br /> <br />111\ <br />;::: <br />~ <br />"'" <br /> <br />MAIN <br />CONDENSER <br /> <br /> <br />AIR IN <br /> <br />AIR IN <br /> <br /> <br />SIDE - STREAM <br />SOFTENING <br /> <br /> <br />MAKE -UP <br />TREATMENT <br /> <br />OlOWDOWN <br /> <br />REJECT <br /> <br />REJECT <br /> <br /> <br />BRINE EVAPORATION POND <br /> <br />Fig. 5 WET COOLING TOWER <br />WATER TREATMENT OPTIONS <br /> <br />of operation, side stream (lime or lime-soda) softening processes <br />would be used to control the corrosion and scaling properties of the <br />cooling water within reasonable ranges. One promising advancement <br />for scale control in evaporation systems is a circulated seed slurry <br />process which allows brines to be concentrated to high TDS levels <br />without scaling, Through use of a chemical slurry, the process <br />encourages crystal growth in the brine rather than on heat transfer <br />surfaces [11]. <br /> <br />In Cal i forn i a, water treatment processes wi 11 be exami ned in a pil ot <br />plant study to treat agri cu ltura 1 wastewater for powerp 1 ant cool i ng. <br />A 3-year field test program completed in 1978 demonstrated that <br />existjng processes are technically feasible for treatment of 2,000- <br />to 6,000-mg/L TDS wastewater for powerplant cooling. The treatment <br />processes development in this program include softening pretreatment <br />of the wastewater by ion exchange resin and regeneration of the <br />resin using concentrated cooling tower b10wdown or effluent from an <br />ev apor ator [12]. <br /> <br />IV-17 <br /> <br />