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WSP10774
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Last modified
1/26/2010 3:14:39 PM
Creation date
10/12/2006 4:31:48 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8271.200
Description
Colorado River Basin Salinity Control Program - Development and History - UCRB 13a Assessment
Basin
Colorado Mainstem
Water Division
5
Date
1/1/1979
Title
Costs of Wastewater Disposal in Coal Gasification and Oil Shale Processing
Water Supply Pro - Doc Type
Report/Study
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<br />~.. <br />en <br />o <br />CO <br /> <br />in the coal reactor. This wastewater must be disposed of in an environmentally <br />acceptable manner. <br />There are a number of ~ays that the wastewate~ st:eam can be disposed of <br />besides impoundment in evaporaeion ponds. Cne is to dispose of the wastewater <br />by using it for dust control. However, the wastewater must be treated to remove <br />any leachable contaminants, thus wastewaters containing highly concentrated salts <br />will not be used for this purpose, but treated condensate may be used if ammonia <br />and phenols are removed to sufficiently low levels. Not enough data is available <br />to determine the proper limits for disposal. Another method of disposal is to <br />wet down the coal ash with the concentrated b1owdowns. The cost of disposal is <br />negligible for this case if the coal ash site is prepared to prevent groundwater <br />contamination from coal and ash leachates. We have not considered the cost that <br />may be necessarj to upgrade the ash site if salty water is used to wet the <br />ash. Sufficient data is not available to determine the level of salts and organi= <br />matter in the wastewaters that may be unacceptable for disposal. <br />Contaminated rain run-off from the plant site, ~ining area and waste storage <br />area is collected and impounded. Oil will be separated and ~~e im90uncec wate~ <br />mixed with other waters as makeup to the circulating cooling syste~. We have <br />not considered the costs of collecting, impounding and monitoring contaminatec <br />run-off. <br /> <br />The flow rates and costs of trea~~ent and disposal are given below for a <br /> <br />250 x 106 sc:/day coal conversion plant producing either pipeline gas, or medi'~ <br /> <br />or low 3tu gas. <br /> <br />The flo~ rates that are given are the operating en-stream flow <br /> <br />rates. The costs are based upon a stream factor of 90 percent. As a basis of <br />comparison, the cost of pipeline gas is estimated to be about 53-4/106 Btu of <br />product output. <br />Three waste streams are identified: <br /> <br />a) Run-off from Rain <br /> <br />Quantity: Ve~l variable, maximum 125 gal/min (= 200 acre-ft/yr) based <br /> <br />on 15 inches/yr rain on 160 acres. <br /> <br />l:;;1uali tv: <br /> <br />Depends on housekeeping, may have oil, otherwise most <br /> <br />probably good quality. <br /> <br />Quality from coal pile depends <br /> <br />on pyrite content of coal. <br /> <br />3 <br />
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