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<br />active areas, such as the Dlant site, mining area and waste storage areas, <br /> <br />I-" <br />OJ <br />N <br />...... <br /> <br />from any precipitation event less than or equal to a lO-year, 24-hour even~, <br />would have to be contained. If discharged, its quality would be monitored and <br />the runoff treated to meet effluent limitations. The quality of the run-off <br />will depend on the cleanliness of the plant. In the usual case, oil will be <br />separated and impounded water mixed with other waters as makeup ~o the circulating <br />COOling system~ Run-off will not exceed 5\ of ehe average cooling water <br />makeup. <br /> <br />Although run-off <br /> <br />from piles of eastern high pyrite coals is usually very <br />1 <br />and sulfate , this is not necessarily true for low <br /> <br />acid and high in iron <br /> <br />pyrite western coals. Run-off from the Neal Generating Station in Iowa, asing <br />. 'd 2 <br />a Wyoming coal, is expected to be alkaline and low Ln total dissolved SOlL s <br />The need to segregate coal pile r~noff will depend on the coal. Consideration <br />should also be given to groundwater contamination and the permeability of the <br />coal pile storage area. In any event all that is necessa~l is to surround tr.e <br />coal pile with a dit=h in which :ain run-off accumulates and from ~hich it <br />evaporates. This is done, for example, at the steam-electric generacing <br />station i~ Hayden, Colorado and at other stations in the West. <br />The costs of impounding the runoff and monitoring its quantity and qualicy <br />fer discharge have not been estimated. <br />On Figure 2-2 is shown a sim~liti:d example of one possible ~ater ma~aga~ent <br />scheme for a Lur~i process plant in New Mexico produci~g 250 x 106 scf/day of <br />pipeline gas. The flew rates are shown in gallons per minute and. acre-ft/y!." <br />and are the :ull operating rates. This figure will serve as background to the <br />following discussion on various process water streams. <br />2.3 Waste from Boiler reed Water Preparation <br />2.3.1 Quantities of Boiler Feed Water. Coal gasification consumes water <br />as a source of hydrogen. To make 250 x 106 sef/day of pipeline gas, which is <br />over 90% methane (CH4) , theoretically requires hydrogen in an amount equivalent <br />to 790 x 103 lblhr water (~ 1560 gal/min ~ 2550 acre-ft/yr, Reference 3). Not <br />all processes require that this water be added as steam~ Concepeual designs <br />for Biqas 9rocess plants include pumping the coal up to gasifier pressure i~ a <br />slurry in water. The water is evaporated inside the gasifier systern~ This <br />means that this par~ of the water does not ~ave to be deionizec; salts dissolved <br />in the water mostly end u9 wi~, the coal ash~ <br /> <br />16 <br />