Springfield limestone

Nine forced oxidation runs were performed with manganese, manganese plus iron, Springfield limestone, or Springfield limestone plus fly ash. The common factor involved in all these runs was the presence of manganese ions in the scrubber liquor. The presence of manganese caused a significant reduction in the adipic... 

The resulting adipic acid degradation rate did not differ significantly from that of limestone alone. In bench-scale tests at Shawnee and Springfield, in which boiler flue gas with fly ash was utilized, no significant effect of fly ash was observed. 

Lower adipic acid degradation rates were observed when Springfield limestone, rather than CaCC>3, was used as the alkaline species. This result is due to the presence of soluble manganese in the limestone. 

The weight percent solids in the filter cake, from which the adipic acid loss in liquid associated with the filter cake is calculated, was assumed to be that determined during full-scale testing in Springfield. Ten percent of the total solids were assumed to be inerts, either from the fly ash or the limestone. 

Springfield Full-Scale Demonstration. In August and September 1980, the EPA, through its contractor, Radian Corporation, conducted the first demonstration of the commercial feasibility of adipic acid addition to a full-scale limestone scrubber (8). 

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