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- Title
EFFECT OF IRON, NICKEL AND COBALT ON BACTERIAL ACTIVITY AND DYNAMICS DURING ANAEROBIC OXIDATION OF ORGANIC MATTER.
- Authors
Ram, M. Sai; Singh, L.; Suryanarayana, M. V. S.; Alam, S. I.
- Abstract
The present study reports on the effect of Fe<MATH>^2+</MATH>, Ni<MATH>^2+</MATH> and CO<MATH>^2+</MATH> on anaerobic bacterial activity and dynamics during anaerobic mineralization of organic matter. Fe<MATH>^2+</MATH> stimulated biogas yield and methane content at 37 °C, but inhibited same marginally at low temperatures (10 and 20 °C). Ni<MATH>^2+</MATH> and CO<MATH>^2+</MATH> inhibited methane production; the toxicity increased with decreasing temperature. Fe<MATH>^2+</MATH> stimulated sulfate reducing bacterial (SRB) and methane producing bacterial (MPB) counts while Ni<MATH>^2+</MATH> and CO<MATH>^2+</MATH> inhibited the same. All the metals had no effect on obligate proton reducing bacterial (OPRB) counts. Fe<MATH>^2+</MATH> stimulated, Ni<MATH>^2+</MATH> severely and CO<MATH>^2+</MATH> appreciably inhibited H<MATH>_2</MATH> uptake and acetate/propionate utilization irrespective of presence/absence of sulfate. Thus, Ni<MATH>^2+</MATH> and CO<MATH>^2+</MATH> inhibited the overall anaerobic degradative process by inhibiting SRB and MPB activity.
- Subjects
ORGANIC compounds; IRON; NICKEL; COBALT; ANAEROBIC bacteria; OXIDATION
- Publication
Water, Air & Soil Pollution, 2000, Vol 117, Issue 1-4, p305
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1023/A:1005100924609