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Anaerobic treatment of sulfate-containing municipal wastewater with a fluidized bed reactor at 20 °C

Düppenbecker, Bernhard and Cornel, Peter (2016):
Anaerobic treatment of sulfate-containing municipal wastewater with a fluidized bed reactor at 20 °C.
In: Water Science and Technology, IWA Publishing, pp. 2446-2452, 73, (10), ISSN 0273-1223, DOI: 10.2166/wst.2016.109, [Online-Edition: http://wst.iwaponline.com/content/73/10/2446],
[Article]

Abstract

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.

Item Type: Article
Erschienen: 2016
Creators: Düppenbecker, Bernhard and Cornel, Peter
Title: Anaerobic treatment of sulfate-containing municipal wastewater with a fluidized bed reactor at 20 °C
Language: English
Abstract:

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.

Journal or Publication Title: Water Science and Technology
Volume: 73
Number: 10
Publisher: IWA Publishing
Divisions: 13 Department of Civil and Environmental Engineering Sciences
13 Department of Civil and Environmental Engineering Sciences > Institute IWAR
13 Department of Civil and Environmental Engineering Sciences > Institute IWAR > Wastewater Technology
Date Deposited: 06 Sep 2017 14:08
DOI: 10.2166/wst.2016.109
Official URL: http://wst.iwaponline.com/content/73/10/2446
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