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Technical Report

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Slurry Pipelining, Water Quality, Saline Water, Biochemical Oxygen Demand, Eastern Coal


Interest in the use of slurry pipelines for the movement of large volumes of coal over long distances has increased rapidly during the last decade. In the early 1970's, this interest involved the movement of Western coals to markets in the southwestern and western United States. In recent years, however, interest in the use of slurry pipelines for transporting Eastern coal developed. Very little information was available concerning the water quality aspects of the slurry pipelining of Eastern coal. The research program was developed to commence building the data base in this regard. Extensive water quality investigations were conducted using two Eastern coals and various water sources to determine the coal-water relationships. Large concentrations of sulfate, hardness, sodium, and total dissolved solids were measured in slurry wastewaters prepared with the two coals. Additionally, large chloride concentrations were measured in slurry wastewaters prepared with the Illinois coal. Ultimate biochemical oxygen demand curves were developed for several coals at selected mixing periods to determine the biodegradable organic load represented by the slurry wastewater. Laboratory studies were conducted to determine the fate of chloride when saline water is used to form the coal slurry. Mass balances were used to determine these results.

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