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Concentrations of (a) sulphate, (b) sulphide, and (c) ferrous iron as well as (d) the most probable number of SRB in the groundwater circulating through the three FC cabinets supplemented with 2.2 mℳ O2 plus 7.9 mℳ N2 (•), 11 mℳ methane (▪) and 10 mℳ H2 plus 11 mℳ methane (▴).
