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<br />~ <br />en <br />~. <br />~ <br /> <br />Quality: This is strongly dependent on the gasification process as <br />this controls the quality of the cooling system makeup. A <br />range of bad quality b1owdown is shown on Table 2-12. <br />Some gasification processes will have less organic contamination. <br />Disoosa1: Most plans call for disposal of this water with coal ash <br />at zero treatment cost. If, for a chosen process, the organic <br />content is unacceptable, it can be reduced by: <br />(1) Adding biotreatment to the makeup at a cost of S2.4 <br />to S5.6/1000 gals (= S780 - S1830/acre-ft) blowdown or <br />6 <br />0.3~/10 Btu with variations of approximately five-fold to <br />one-half. <br />(2) Adding resin adsorption to the makeup at a cost of <br />S9-21/1000 gals (= S2930 - $6850/acre-ft) blowdown, or <br />6 <br />1.2~/10 Btu with variations of approximately five-fold to <br />one-half. <br />(3) Adding resin adsorption to the blowdown at a cost of <br />about $3/1000 gals (= $9S0/acre-ftl, or 0.4~/106 Btu with <br />variations of two-fold to one-half. <br />(4) Adding activated carbon adsorption to the blowdown at a <br />cost ve~J dependent on water quality and ranging from Sl to <br />over $12/1000 gals (= $330 - $3900/acre-ft), or 0.1~/106 Btu <br />with variations of approximately 25-fold to one-half. <br />(5) Adding wet oxidation to the blowdown at a cost of about <br />$6/1000 gals (= S1960/acre-ft), or O.8~/106 Btu with variations <br />of two-fold to one-half. <br /> <br />Unfortunately, the quality effluent from ~e5e treatme~ts cannot be defined. <br />Resin adsorption is not an established technology. If it works, it will be <br />placed in the blowdown at about $3/1000 gals (Item (3) above). The second choice <br />is biotreatment and its use depends on the biodegradability of the waste. The <br />cost is probably higher than resin adsorption and the quality may be better or <br />worse. Both activated carbon and wet oxidation are expected to give the best <br />quality effluent. Wet oxidation, at $6/1000 aa1s (= $1960/acre-ft), will be <br />~sed when acti~ated carbon would cost more than this, othe~~ise carbon would <br />~e used. <br />