Any suggestions of role of sulfates (Na2SO4.10H20) as trace elements in anaerobic synthetic wastewater treatment (glycerol, NaNO3, KH2PO4) in batch reactor (increasing of sulfates in wastewater favorise removal of COD).
If You use sulfates as the only source of sulfur in synthetic wastewater, bacteria will assimilate it (the first :will reduce sulfate to sulfide, and next: assimilate to aminoacids, serine and cysteine). Otherwise sulfates are final electron acceptors in anaerobic processes of organic matter degradation. These ions are used by bacteria under low redox potential. The sulfate reduction is more favorable energetically than e.g. reduction of CO2, so high sulfate concentration can inhibit a methane production.
increasing of sulfate in wastewater may favorise removal of COD but it will decrease CH4 removal because sulfate reducing bacteria will compete with methanogens for COD but also because H2S, the product of sulfate reduction, inhibits methanogenesis
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