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KMID : 0545120020120050849
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Journal of Microbiology and Biotechnology
2002 Volume.12 No. 5 p.849 ~ p.853
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Copper Ion Toxicity Causes Discrepancy between Acetate Degradation and Methane Production in Granular Sludge
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BAE, JIN-WOO
RHEE, SUNG-KEUN/JANG, AM/KIM, IN S./LEE, SUNG-TAIK
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Abstract
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Metal ions have an adverse effect on anaerobic digestion. In an acetate degradation test of upflow of anaerobic sludge blanket granules with Cu^2+, not all of the acetate that disappeared was stoichiometrically converted to methane. In the presence of 400 mg/n-VSS (volatile suspended solids) Cu^2+, only 26% of the acetate consumed was converted to methane. To study acetate conversion by other anaerobic microorganisms, sulfate and nitrate reductions were investigated in the presence of Cu^2+. Sulfate and nitrate reductions exhibited more resistance to Cu^2+ than methanogenesis, and the granules reduced 2.2 mM and 5.4 mM of nitrate and sulfate, respectively, in the presence of 400 mg/g-VSS copper ion. However, the acetate degraded by sulfate and nitrate reductions was only 24% of the missing acetate that could have been stoichiometrically converted to CO_2. Accordingly, 76% of the acetate consumed appeared to have been converted to other unknown compounds.
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