Performance and ethanol oxidation kinetics of a sulfate-reducing fluidized-bed reactor treating acidic metal-containing wastewater |
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Authors: | Kaksonen Anna H Franzmann Peter D Puhakka Jaakko A |
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Institution: | (1) Institute of Environmental Engineering and Biotechnology, Tampere University of Technology, P.O. Box 541, FIN-33101 Tampere, Finland;(2) CSIRO Land and Water, Underwood Avenue, Floreat Park, Private Bag No. 5, Wembley, WA 6913, Australia |
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Abstract: | The treatment of simulated acidic wastewater (pH 2.5–5)containing sulfate (1.0–2.2 g l-1), zinc (15–340 mg l -1) and iron (57 mg l -1) was studied in a sulfate-reducing fluidized-bed reactor (FBR) at 35 °C.The original lactate feed for enrichment and maintenance
of the FBRculture was replaced stepwise with ethanol over 50 days. The robustnessof the process was studied by increasing
stepwise the Zn, sulfate andethanol feed concentrations and decreasing the feed pH. The following precipitation rates were
obtained: 360 mg l -1 d -1 for Zn and 86 mg l -1 d -1 for Fe, with over 99.8% Zn and Fe removal, with a hydraulic retention time of 16 h. Under these conditions, 77–95% of the
electrons were accepted by sulfate reduction. The alkalinity produced from ethanol oxidation increased the wastewater pH from
2.5 to 7.5–8.5. Michaelis–Menten constants (Km) determined in batch FBR experiments, were 4.3–7.1 mg l -1 and 2.7–3.5 mg l -1 for ethanol and acetateoxidation, respectively. The maximum oxidation velocities (Vmax)were 0.19–0.22 mg gVS -1 min -1 and0.033–0.035 mg gVS -1 min -1, for ethanol and acetate, respectively. In summary, the FBR process produced a good quality effluent as indicated by its
low organic content and Zn and Fe concentrations below0.1 mg l -1. |
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Keywords: | acetate ethanol fluidized-bed reactor oxidation kinetics sulfate reduction wastewater |
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