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<br />Use for low quality needs such as shale disposal; no <br /> <br />treatment~ If disposal is req~ired, evaporate along ~it~ <br /> <br /> <br />ex~ess mine drainage concentrate. Additional cost may be <br /> <br />neglected in comparison with other disposal costs. <br /> <br />Coolinq Tower Slowdown <br /> <br />1-4 <br />O':l <br />~., <br />-..1 <br /> <br />Disposal: <br /> <br />e) <br /> <br />It is assumed that upgraded foul retort water is used in the cooling <br /> <br />tower. Treatment is assumed to yield a water with relatively low organics <br /> <br />contamination, but bicarbonate level may be moderate. Acidification or li~e <br /> <br />softening of the water may be required. <br /> <br />Quantity: 70-160 gpm (= 110 - 260 acre-ft/yr). <br /> <br />Quali tv: <br /> <br />Disposal: <br /> <br />Lower organics concentration, but possibly somewhat <br />higher total dissolved solids than shown in Table 2-12. <br /> <br />Use for dust control, shale disposal and mine uses. <br /> <br />H <br />-. <br /> <br />water is in excess of plant needs and dis9osa1 is required, <br />higher cycles of concentration would be used in cooling <br />tower to give lower blowdown quantity of 70 gpm. Disposal <br />would be done by forced evaporation in same type vapor <br />co~pression system used for concen~rate fram excess mine <br />drainage water treatment. Dis90sal cost would range <br /> <br />between ~5.85 and $6.85/100 gal (= ~1910 - 2230/acre-f~) of <br />6 <br />blowdown. or 0.2~/10 Btu. <br /> <br />f) Domestic Wastes from Plant <br /> <br />Quantity: <br />Quali t\. : <br /> <br />Oisoosal: <br /> <br />45 gpm (= 70 acre-ft/yr). <br />Typical domestic wastewater with a low TDS and a BCD of <br />2CO-250 mg/l after primary treatment. <br />Secondarj treatment by packaged activated sludge unit at <br />a cost of $1.95/1000 gal ($630/acre-ft), or 0.049/106 Btu. <br /> <br />and then use for revegetation, or low quality water needs. <br />g) Mine Water Treatment for plant Use <br />This is discussed under mine water treatment eoncen~ra~e (Sec~ion 4.4.1). <br /> <br />Quantity: <br />Qualit'l : <br />Treatment: <br /> <br />1645 gpm (= 2970 acre-ft/yr). <br /> <br />Same as excess mine drainage wate=. <br />T~eated to same quality as water for surface discharge <br /> <br />12 <br />