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Fluidized glass beads reduce fouling in a novel anaerobic membrane bioreactor

Düppenbecker, Bernhard and Kale, Sinem and Engelhart, Markus and Cornel, Peter (2017):
Fluidized glass beads reduce fouling in a novel anaerobic membrane bioreactor.
In: Water Science and Technology, IWA Publishing, pp. 953-962, 74, (4), ISSN 0273-1223,
DOI: 10.2166/wst.2017.274,
[Online-Edition: http://wst.iwaponline.com/content/76/4/953],
[Article]

Abstract

This study focuses on the use of fluidized glass beads as turbulence promoters in a laboratory-scale anaerobic membrane bioreactor treating municipal wastewater at 20 °C. The addition of fluidized glass beads into an external tubular ceramic membrane enabled the operation at low crossflow velocities of 0.053–0.073 m/s (mean fluxes between 5.5 and 9.7 L/(m2·h)) with runtimes >300 h. Glass beads with a diameter of 1.5 mm were more effective than smaller ones with a diameter of 0.8–1.2 mm. Increasing the bed voidage from 74 to 80% did not show any beneficial effect. As scanning electron microscope examination showed, the fluidized glass beads damaged the used membrane by abrasion. The overall total chemical oxygen demand (COD) removal was between 77 and 83%, although mean hydraulic retention times were only between 1.3 and 2.3 h. The production of total methane was increased about 30% in comparison to the bioreactor without membrane. The increased methane production is presumably attributed to biological conversion of rejected, dissolved and particulate organic matter. The total required electrical energy was predicted to be about 0.3 kWh/m³.

Item Type: Article
Erschienen: 2017
Creators: Düppenbecker, Bernhard and Kale, Sinem and Engelhart, Markus and Cornel, Peter
Title: Fluidized glass beads reduce fouling in a novel anaerobic membrane bioreactor
Language: English
Abstract:

This study focuses on the use of fluidized glass beads as turbulence promoters in a laboratory-scale anaerobic membrane bioreactor treating municipal wastewater at 20 °C. The addition of fluidized glass beads into an external tubular ceramic membrane enabled the operation at low crossflow velocities of 0.053–0.073 m/s (mean fluxes between 5.5 and 9.7 L/(m2·h)) with runtimes >300 h. Glass beads with a diameter of 1.5 mm were more effective than smaller ones with a diameter of 0.8–1.2 mm. Increasing the bed voidage from 74 to 80% did not show any beneficial effect. As scanning electron microscope examination showed, the fluidized glass beads damaged the used membrane by abrasion. The overall total chemical oxygen demand (COD) removal was between 77 and 83%, although mean hydraulic retention times were only between 1.3 and 2.3 h. The production of total methane was increased about 30% in comparison to the bioreactor without membrane. The increased methane production is presumably attributed to biological conversion of rejected, dissolved and particulate organic matter. The total required electrical energy was predicted to be about 0.3 kWh/m³.

Journal or Publication Title: Water Science and Technology
Volume: 74
Number: 4
Publisher: IWA Publishing
Divisions: 13 Department of Civil and Environmental Engineering Sciences > Institute IWAR
13 Department of Civil and Environmental Engineering Sciences > Institute IWAR > Wastewater Technology
13 Department of Civil and Environmental Engineering Sciences
Date Deposited: 04 Apr 2018 10:04
DOI: 10.2166/wst.2017.274
Official URL: http://wst.iwaponline.com/content/76/4/953
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