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Energy, cost and design aspects of coarse- and fine-bubble aeration systems in the MBBR IFAS process

Sander, Stephan and Behnisch, Justus and Wagner, Martin (2016):
Energy, cost and design aspects of coarse- and fine-bubble aeration systems in the MBBR IFAS process.
In: Water Science and Technology, IWA Publishing, 75, (4), ISSN 0273-1223,
DOI: 10.2166/wst.2016.571,
[Article]

Abstract

With the MBBR (moving bed biofilm reactor) IFAS process (integrated fixed-film activated sludge), the biomass required for biological wastewater treatment is either suspended or fixed on free-moving plastic carriers in the reactor. Coarse- or fine-bubble aeration systems are used in the MBBR IFAS process. In this study, the oxygen transfer efficiency (OTE) of a coarse-bubble aeration systems was improved significantly by the addition of the investigated carriers, even in-process (\~1% per vol-% of added carrier material). In a fine-bubble aeration system, the carriers had little or no effect on OTE. The effect of carriers on OTE strongly depends on the properties of the aeration system, the volumetric filling rate of the carriers, the properties of the carrier media, and the reactor geometry. This study shows that the effect of carriers on OTE is less pronounced in-process compared to clean water conditions. When designing new carriers in order to improve their effect on OTE further, suppliers should take this into account. Although the energy efficiency and cost effectiveness of coarse-bubble aeration systems can be improved significantly by the addition of carriers, fine-bubble aeration systems remain the more efficient and cost-effective alternative for aeration when applying the investigated MBBR IFAS process

Item Type: Article
Erschienen: 2016
Creators: Sander, Stephan and Behnisch, Justus and Wagner, Martin
Title: Energy, cost and design aspects of coarse- and fine-bubble aeration systems in the MBBR IFAS process
Language: English
Abstract:

With the MBBR (moving bed biofilm reactor) IFAS process (integrated fixed-film activated sludge), the biomass required for biological wastewater treatment is either suspended or fixed on free-moving plastic carriers in the reactor. Coarse- or fine-bubble aeration systems are used in the MBBR IFAS process. In this study, the oxygen transfer efficiency (OTE) of a coarse-bubble aeration systems was improved significantly by the addition of the investigated carriers, even in-process (\~1% per vol-% of added carrier material). In a fine-bubble aeration system, the carriers had little or no effect on OTE. The effect of carriers on OTE strongly depends on the properties of the aeration system, the volumetric filling rate of the carriers, the properties of the carrier media, and the reactor geometry. This study shows that the effect of carriers on OTE is less pronounced in-process compared to clean water conditions. When designing new carriers in order to improve their effect on OTE further, suppliers should take this into account. Although the energy efficiency and cost effectiveness of coarse-bubble aeration systems can be improved significantly by the addition of carriers, fine-bubble aeration systems remain the more efficient and cost-effective alternative for aeration when applying the investigated MBBR IFAS process

Journal or Publication Title: Water Science and Technology
Volume: 75
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: 06 Sep 2017 14:13
DOI: 10.2166/wst.2016.571
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