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<br />t-4 <br />en <br />o <br />CD <br /> <br />Disposal: Will be collected and impounded prcperly. Can be fed to <br /> <br />cooling system or used for other low quality in-plant uses. <br /> <br />No trea~~ent except for oil separation. Costs not esti~ated. <br /> <br />b) Waste from Boiler Feedwater Preparation <br /> <br />Quantity: 200 ga1/min (= 320 acre-ft/yr) with variations of two-fold to <br /> <br />one-fifth. <br /> <br />QuaE ty: <br /> <br />2 to 2.5\ total dissolved solids; no. organic contamination. <br /> <br />Disposal: (11 Not useful within the plant. May be mixed with coal ash <br />at negligible cost if groundwater protected. <br />(2) Disposal in a lined evaporation pond averages $4.6/1000 <br />gals (= SlSOO/acre-ft). A standard size plant requires about <br />110 acres wi~~ variations of two-fold to one-fif~h. T~e cost <br />is 0.60/106 Btu product output with the same variation. <br />(3) Slowdown might first be treated by a vapcr compression <br />evaporator and then disposed of in a much smaller pond. ~ <br />vapor compression evaporator costs $5.6 to $10/1000 gals after <br />taking credit for clean water recovered. The evaporation pond <br />following a forced evaporator need be less than 10 acres. ~he <br />total cost of vapor compression and natural evaporation is <br />O.7C/I06 Btu with variations of approximately three-fold ~o <br />one-fifth. <br />cJ Cooling Tower Slowdown <br />Mote: Organically contaminated condensate, e:fluent from the gasi:ier, <br />is assumed treated to such a quality that, when diluted with additional <br />river water as needed, the mixture is satisfactory =or makeup ~o a <br />cooling tower. An example of a water acceptable in a cooling system <br />is given on Table 2-10. Necessarf t=eatments ahead of the con ling <br />system are described in S~ction 2.7 and costs given. These treatments <br />are taken to be essential for plant operation, as distinct from <br />environmental protection, and not summarized here. <br />Quantity: 220 gal/min (= 350 acre-ft/yr) with variations of two-folo <br />to one-half. <br /> <br />4 <br />