Effects of sulphate addition and sulphide inhibition on microbial fuel cells.

Enzyme and microbial technology (2012-12-04)
I Ieropoulos, A Gálvez, J Greenman

The effects of adding sulphate in: (i) standard activated sludge microbial fuel cells (MFCs) and (ii) larger-scale leachate-treating columns - both as individual units and as a system connected in cascade - are reported. S-replete power output was ∼2-fold higher than that of the S-deplete MFC. Furthermore, the effects of evolved sulphide (S(2-)) inhibition were investigated. The overall decrease in power output from the sulphide inhibitor (Na(2)MoO(4)) additions was 83% for the S-replete and 90% for the S-deplete. The second phase with the leachate treating units shows an improvement of 32-86% (depended on leachate strength) in current output as a result of adding sulphate. When leachate column MFCs were connected fluidically in series, the amount of Na(2)SO(4) made available downstream was decreasing (increase in power was 99%, 40% and 12% for columns in cascade). Results demonstrated the beneficial effects of added sulphur sources to both activated sludge and leachate-treating MFCs.

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Sodium molybdate dihydrate, ACS reagent, ≥99%
Sodium molybdate dihydrate, ≥99.5%
Sodium molybdate, ≥98%
Sodium molybdate dihydrate, ≥99.5%, suitable for plant cell culture
Sodium molybdate, anhydrous, powder, −100 mesh particle size, 99.9% trace metals basis
Sodium molybdate dihydrate, 99.99% trace metals basis

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