Removal of color and residual chemical oxygen demand from synfuel wastewater. Final technical report, April 1, 1987-March 31, 1988 including Quarterly technical progress report, January-March 1988.

摘要

Color has been classified as a ''nonconventional'' water pollutant by the Clean Water Act of 1977. This designation allows the government to regulate the amount of color in discharged effluent where warranted. Discharged color detracts from the aesthetic value of the receiving water, and can be a source of public concern. Color may also have negative effects on aquatic life due to decreased light transmittance and toxic effects. The production of synthetic natural gas from coal results in a wastewater with high levels of phenols, ammonia, and organics. This wastewater requires a multiple-stage treatment process to meet discharge regulations. Treatment processes commonly used for coal conversion wastewaters include solvent extraction, stream stripping, and biological oxidation and nitrification. An additional concern with these wastewaters is the presence of color. High levels of color are common in coal conversion wastewaters, even subsequent to secondary treatment. Since the discharge of colored water presents an environmental concern as discussed above, the need for economical, effective methods to remove this color exists. The objective of this research is to evaluate color removal from a coal conversion wastewater by solvent extraction, adsorption, and biological methods. 15 refs., 9 figs., 9 tabs. (ERA citation 15:033882)