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Title Effect of calcium and dibasic acids on selected strains of neutrophilic sulfur-oxidizing bacteria
Creator/Author Miller, K.W. [Illinois State University, Normal, IL (United States). Dept. of Biological Sciences]
Publication Date1996 Jul 01
OSTI IdentifierOSTI ID: 394388
Other Number(s)JEVQAA; ISSN 0047-2425
Resource TypeJournal Article
Resource RelationJournal of Environmental Quality ; VOL. 25 ; ISSUE: 4 ; PBD: Jul-Aug 1996
Subject20 FOSSIL-FUELED POWER PLANTS ;55 BIOLOGY AND MEDICINE, BASIC STUDIES ;01 COAL, LIGNITE, AND PEAT ; SULFUR-OXIDIZING BACTERIA; FLUE GAS; DESULFURIZATION; THIOSULFATES; OXIDATION; CALCIUM IONS; BIOCONVERSION; INHIBITION; WASTE MANAGEMENT; SLURRIES; SULFUR
Description/Abstract During inhibited flue gas desulfurization (FGD), thiosulfate is added to the limestone sorbent slurry in order to inhibit oxidation of CaSO{sub 3}, the product of SO{sub 2} capture. Since bio-oxidation of reduced sulfur produces H{sub 2}SO{sub 4}, stabilization of dissolved sulfur prior to environmental release is desirable. Three neutrophilic autotrophic strains of sulfur-oxidizing bacteria, Thiobacillus neapolitans ATCC 23641, ATCC 23639, and the strain TQ were tested for the ability to oxidize thiosulfate in the supernatant of a spent slurry from an inhibited FGD process that employs dibasic acids (DBA). Strain TQ, an unidentified isolate from a slurry pond, lowered S{sub 2}O{sub 3}{sup 2-} from 540 mg L{sup -1} to{lt} 25 mg L{sup -1} during this time. Experiments using defined media showed for all strains that adipic or glutaric acid at 200 mg L{sup -1} or (Ca{sup 2+}) up to 10 g L{sup -1} failed to prevent thiosulfate oxidation; however, the combined effect of adipic acid along with{ge} 1.5 g L{sup -1} Ca{sup 2+} or glutaric acid along with{ge} 10 g L{sup -1} Ca{sup 2+} prevented thiosulfate oxidation by ATCC 23639. Similarly, adipic or glutaric acid along with{ge} 5 g L{sup -1} Ca{sup 2+} prevented thiosulfate oxidation by ATCC 23641. Magnesium concentration{le} 2.5 g L{sup -1} had little or no ameliorating effect. In contrast, neither dibasic acid along with the highest Ca{sup 2+} tested, 10 g L{sup -1}, affected thiosulfate oxidation by strain TQ. Greater resistance to the combined effect of Ca{sup 2+} and dibasic acids probably contributes to the ability of strain TQ to oxidize thiosulfate in the slurry supernatant. 17 refs., 3 figs.
Country of PublicationUnited States
LanguageEnglish
Formatpp. 854-857 ; PL:
System Entry Date2001 May 05

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