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Nickel stimulation of anaerobic digestion

Nickel stimulation of anaerobic digestion

Water Research 17(6): 677-684

An acetate-enriched methanogenic bacterial culture was assayed for nutitional stimulation by Ni in combination with other inorganic and and organic nutrients, i.e., Fe, Co, yeast extract, riboflavin and vitamin B12. Acetate was automatically maintained at 2-3 g/l by a ph Stat system so that substrate was not limiting. In the absence of Ni, the specific acetate utilization rates were in the range of 2-4.6 g acetate/g VSS [voltage suspended solids]/day. In the presence of Ni, this rate was as high as 10; when Ni and yeast extract were supplemented, this rate temporarily increased to 12-15 g acetate/g VSS/day. The maximum acetate utilization rate was 51 g/l/day as compared to 3.3 g/l/day for conventional high-rate digestion. Daily PO43- additions were required to sustain these high acetate utilization rates. An acetate utilization rate of 20-30 g/l/day was maintained for > 25 days. Microscopic examination of the culture revealed a predominance of a sarcina whenever stimulation was noted.

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Accession: 005983630

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DOI: 10.1016/0043-1354(83)90237-3

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