This study focuses on the anaerobic treatment of sulfate-containing municipal wastewater at 20 °C with a fluidized bed reactor. Mean influent chemical oxygen demand (COD) and sulfate concentrations were 481 and 96 mg/l. The response of the COD removal efficiency to increasing organic loading rates (OLR) was investigated. Average total COD removal was 61% at OLR between 2.7 and 13.7 kg COD/(m³·d) and did not distinctly depend on the OLR. To assess the removal efficiency in more detail the COD in- and output mass flows were balanced. The results showed that only 11–12% of the input COD was recovered as gaseous methane. About 12–13% of the input COD remained in the effluent as dissolved methane. Furthermore, a distinct amount of 12–19% of the input COD remained in the reactor as settled sludge and was not further biologically degraded. Due to the reduction by sulfate-reducing bacteria, 13–14% of the input COD was degraded. Further adverse impacts of the influent sulfate on the anaerobic treatment process are discussed as well.
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Research Article| February 26 2016
Anaerobic treatment of sulfate-containing municipal wastewater with a fluidized bed reactor at 20 °C
B. Düppenbecker, P. Cornel; Anaerobic treatment of sulfate-containing municipal wastewater with a fluidized bed reactor at 20 °C. Water Sci Technol 18 May 2016; 73 (10): 2446–2452. doi: https://doi.org/10.2166/wst.2016.109
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