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<br />-" <br /> <br />3.2 Runoff <br /> <br />Runoff is not a difficult problem as long as it is collec~ed and impounded <br /> <br /> <br />properly. For oil shale conversion complexes, starn runoff and leachate from <br /> <br />the processed shale area will be collected and used primarily to control dust <br /> <br />on the processed shale disposal pile, or to moisturize the spent shale. In the <br /> <br />plant area the runoff will contain residual oil which must be separated from <br /> <br />the water before the water can be used in the moisturizer or for dust control <br /> <br />or as makeup to the cooling tower. The quantity of runoff is verj site ceFencent. <br /> <br />3.3 High Total Dissolved Solids Wastewaters <br /> <br />There a=e a n~~er of wastewater streams that contain a large quanti~y of <br /> <br />total dissolved solids. The pri~~l ones a~e the blowdown stream f=om boiler <br /> <br />feeawater makeup t~ea~ent. by ion exchange and the blowaown f~om the cooling tower. <br /> <br />:n <br />~) <br />QJ <br /> <br />3.3.1 Boiler Feedwater ~a~eup Trea~~ent 91owdown. In the TOSCG II <br />orocess steam is ased prL~arily in the upgrad~ng operation2 Steam levels ct <br />60 psi and 400 psi ~ave been proposed, which i~ general are lower than the <br />pressure requirements for the steam generated in coal gasi=ication plants and <br />which, as a result, does not requixe ~s much tred~~ent. Because 0: the =elatively <br />low pressure steam only zeolite softening, 3nG not complete demineralization, <br />has been proposed for boiler feedwater makeup treat~ent. ~he high 9ressure <br />steam passes throu;h t~rbines and drives rotating machinery. The condensate <br />is recycled. ~w pressure steam is consumed for process heating and in stripping <br />col~s. Approximately 1450 gpm (= 2330 acre-ft/yr) of boiler ~a!<eup is <br />required for ~~e 50,000 barrel/day Tasca design2,S, or about 1510 gpm (= 2470 acre- <br />ft/yr) of steam is required for a ?lant producing 50,000 barrel/day of synt~etic <br />crude. In ~\e proposed Tcsco design2, the blowdown from the zeolite softener <br />is sent to the processed shale moisturizer. <br />Our estimate of 7 gpm (= 12 acre-ft/yr) for boiler ~akeup for a Paraho Direct <br /> <br />plant producing 50,000 barrelS/day of ~Jnthetic crude is given <br />This makeup is verI small because there is no upgrading in the <br />However, in the design for the proposed White River Oil Shale <br /> <br />on Figure 3-4. <br /> <br />paraho design. <br />. 3 <br />?ro)ect which <br /> <br />uses a combination 0= ?araho Indirect and Direct heated retorts a~d a Tosca :1 <br />retort, but with a lower grade shale of 28 gal/ton, the boiler makeup requirements <br />are much large~. In the White River design approximately 85 pe~cent by weight <br />of the oil shale will be processed in ?araho retorts and only 15 percent will <br />be processed in a Tosca II retort. A ?araho Di=ect retort will process 71 <br />pe~cent of the cil shale with the other 14 percent used in a Paraho Indirect <br /> <br />61 <br />