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BIOLOGICAL TREATABILITY OF KRW ENERGY SYSTEMS GASIFIER PDU (PROCESS DEVELOPMENT UNIT) WASTEWATERS
Citation:
Castaldi, F. BIOLOGICAL TREATABILITY OF KRW ENERGY SYSTEMS GASIFIER PDU (PROCESS DEVELOPMENT UNIT) WASTEWATERS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/7-85/019.
Description:
The report gives results of bench-scale biological treatability tests with wastewaters produced from the KRW Energy Systems gasifier process development unit (KRW-PDU). Goals of the tests were to assess the biotreatability of these aqueous wastes and to develop data for correlations to establish a basis for designing a biooxidation process. An autotrophic activated sludge process was developed that utilized a mixed culture of nitrifying and sulfur-oxidizing bacteria for simultaneous thiocyanate biodegradation and nitrification. Elevated concentrations of chloride, fluoride, and boron in experimental wastewaters did not inhibit either nitrifying or sulfur-oxidizing bacteria in the activated sludge process. However, heavy metals were concentrated in the activated sludges, thought to be a consequence of the long sludge ages of the experimental process.