Layered structure of granules in upflow anaerobic sludge blanket reactor gives microbial populations resistance to metal ions

Metal ions (Cd^sup 2+^, Cu^sup 2+^, Ni^sup 2+^, Zn^sup 2+^ and Cr^sup 3+^) did not affect glucose degradation or the production of methane during anaerobic digestion with intact and disintegrated granules from a UASB (Upflow Anaerobic Sludge Blanket) reactor. However, when Cu^sup 2+^ was at 500 mg g...

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Bibliographic Details
Published in:Biotechnology letters 2000-12, Vol.22 (24), p.1935-1940
Main Authors: BAE, Jin-Woo, RHEE, Sung-Keun, HYUN, Seung-Hoon, KIM, In S, LEE, Sung-Taik
Format: Article
Language:English
Subjects:
Anaerobic digestion
Biological and medical sciences
Biological treatment of waters
Biotechnology
Cadmium
Copper
Electroplating
Environment and pollution
Fundamental and applied biological sciences. Psychology
glucose
Industrial applications and implications. Economical aspects
Metal ions
Methane
Reactors
Sludge
Suspended solids
zinc
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Summary:Metal ions (Cd^sup 2+^, Cu^sup 2+^, Ni^sup 2+^, Zn^sup 2+^ and Cr^sup 3+^) did not affect glucose degradation or the production of methane during anaerobic digestion with intact and disintegrated granules from a UASB (Upflow Anaerobic Sludge Blanket) reactor. However, when Cu^sup 2+^ was at 500 mg g^sup -1^ VSS (volatile suspended solids) in the media, the glucose degradation rates and methane production rates decreased by 14% and 32% in disintegrated granules, respectively, whereas, in intact granules, decreases were 3% and 14%, respectively. When various electroplating metal ions were tested, 50% inhibition of acetate degradation and methane production were produced by 210-770 mg g^sup -1^ VSS and 120-630 mg g^sup -1^ VSS, respectively. The relative toxicity of the electroplating metals on methane production was in the order of Zn^sup 2+^ (most toxic) > Ni^sup 2+^ > Cu^sup 2+^ > Cr^sup 3+^ > Cd^sup 2+^ (least toxic).[PUBLICATION ABSTRACT]
ISSN:0141-5492
1573-6776
DOI:10.1023/A:1026760604796