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<br />?- <br />m <br />...... <br />~ <br /> <br />If dissolved salts are unacceptable, evaporation ponds or forced evaporators <br />must be used as described for boiler feed water waste above. This water is <br />close to saturation in calcium carbonate and calcium sul:ate and processes <br />that do not tolerate precipitation, such as reverse osmosis, cannot be ~sed. <br />(ll !f the b1owdown is disposed of in lined evaporation ponds, the cost is <br />0.7~/106 Btu with variations of two-fold to one-half. <br />(2) !f the blowdown is first treated by vapor compression and t~en disposed <br />of in evaporation ponds, the cost is 0.8~/106 Btu with variations of <br />approximately three-fold to one-half. <br />d) Treatment of Poul Process Condensate for Internal Plant Reuse <br />Note: The following are conclusions drawn f~om the treatment of foul <br />process condensate for use in the cooling system. This is not a waste- <br />water stream intended for disposal. <br />Quantitv: 1400 gal/min (= 2250 acre-ft/yr) with a range of about two-fold <br />to one-half. <br />Quality: High levels of ammonia, BOD, COD and phenols. See tabulated <br />ex~ples in Appendix. <br />Treatment: Sequential treatment will be used to fit the wa~er for makeu~ <br />to the cooling 5ystem~ Not all waters require all the following <br /> <br />treatments: <br /> <br />(1) Solvent extraction for gross removal of phenols ac a cost <br />6 <br />of about $3/1000 gals (= $980/acre-ft), or 2.5~/10 Bt~ with <br />a variation of about two-fold to one-half. <br />(2) Stripping and recovery of ammonia. In most plants ~~is <br />treatment is covered by the value of recovered ammonia. <br />(3) Biological oxidation at a cost of about SO.80/1000 gals <br />6 <br />(= $260/acre-ft), or 0.7~/10 Btu wi~~ a variation of about <br />two-fold to one-half. <br />e) Domestic Wastes from Plant <br />Quantitv: 28 gpm (= 45 acre-ft/yr) <br />Quality: ~iPical domestic wastewater ~ith a low TDS and a BOD of <br />200-250 mg/l after primary treatment. <br />Oisoosal: Secondary treatment by packaged activated sludge ~it at a <br />cost of $1.95/1000 gals (= S640/acre-ft), or 0.03C/106 Stu, <br />and ~~en used for revegetation or low quali~y water needs. <br /> <br />5 <br />