Sulfate reduction during the acidification of sucrose at pH 5 under thermophilic (55 degrees C) conditions. I: effect of trace metals.
This work studied the effect of supplying trace metals (7.5 microM Fe and 0.5 microM Co, Ni, Mn, Zn, Cu, B, Se, Mo and W) on sulfate reduction and acidification in thermophilic (55 degrees C) UASB reactors fed with sucrose (4 g COD (l(reactor) d)(-1)) operated at a reactor mixed liquor pH controlled at 5. Trace metals were supplied to one UASB reactor and were omitted from the influent of a second UASB reactor. The influence of different trace metal concentrations was further assessed in batch tests performed with the sludge from the UASB reactor receiving no trace metals. The absence of trace metals in the influent did not affect the performance of the acidifying UASB reactor throughout the 305 day long reactor run, but supplying low concentrations of trace metals inhibited sulfate reduction.
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Sub-department of Environmental Technology, Wageningen University Biotechnion, Bomenweg, 2, P.O. Box 8129, 6700 EV Wageningen, The Netherlands.
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D000143:Acids / Q000378:metabolism*; D056804:Biofuels; D019149:Bioreactors; D004583:Electrons; D005232:Fatty Acids, Volatile / Q000032:analysis; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D008670:Metals / Q000494:pharmacology*; D010084:Oxidation-Reduction / Q000187:drug effects; D012995:Solubility / Q000187:drug effects; D013379:Substrate Specificity / Q000187:drug effects; D013395:Sucrose / Q000378:metabolism*; D013431:Sulfates / Q000378:metabolism*; D013696:Temperature; D014131:Trace Elements / Q000494:pharmacology*; D014865:Waste Disposal, Fluid
D000143:Acids; D056804:Biofuels; D005232:Fatty Acids, Volatile; D008670:Metals; D013431:Sulfates; D014131:Trace Elements; D013395:Sucrose