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Quantification of particulate matter attached to the bulk-biofilm interface and its influence on local mass transfer

Li, Chunyan and Brunner, Fabian and Wagner, Michael and Lackner, Susanne and Horn, Harald (2018):
Quantification of particulate matter attached to the bulk-biofilm interface and its influence on local mass transfer.
In: Separation and Purification Technology, pp. 86-94, 197, ISSN 13835866,
[Online-Edition: http://www.sciencedirect.com/science/article/pii/S1383586616...],
[Article]

Abstract

A large fraction of the chemical oxygen demand (COD) in municipal wastewater is associated with the particulate matter. The presence of these particles might impose a negative impact on the mass transfer in biofilm systems when they attach to the bulk-biofilm interface. We thus investigated the impact of real wastewater particles by combining optical coherence tomography (OCT) and oxygen microsensor measurements. The deposition of wastewater particles of different size classes onto the biofilm surface was captured in 3D by means of OCT in a lab-scale flume. The thickness of the particle layer was calculated from OCT images. The influence of the particle deposition with respect to oxygen mass transfer into the biofilm was monitored by measuring oxygen profiles before and after particle deposition. By employing OCT, the formation of the particle layer on the biofilm surface was monitored in situ and non-invasively over time. Results from oxygen microsensor measurements concluded 20–70% reduction of the dissolved oxygen flux from the biofilm surface into the biofilm matrix. This decrease in oxygen availability lowered substrate conversion in biofilms exposed to high loadings of organic wastewater particles.

Item Type: Article
Erschienen: 2018
Creators: Li, Chunyan and Brunner, Fabian and Wagner, Michael and Lackner, Susanne and Horn, Harald
Title: Quantification of particulate matter attached to the bulk-biofilm interface and its influence on local mass transfer
Language: German
Abstract:

A large fraction of the chemical oxygen demand (COD) in municipal wastewater is associated with the particulate matter. The presence of these particles might impose a negative impact on the mass transfer in biofilm systems when they attach to the bulk-biofilm interface. We thus investigated the impact of real wastewater particles by combining optical coherence tomography (OCT) and oxygen microsensor measurements. The deposition of wastewater particles of different size classes onto the biofilm surface was captured in 3D by means of OCT in a lab-scale flume. The thickness of the particle layer was calculated from OCT images. The influence of the particle deposition with respect to oxygen mass transfer into the biofilm was monitored by measuring oxygen profiles before and after particle deposition. By employing OCT, the formation of the particle layer on the biofilm surface was monitored in situ and non-invasively over time. Results from oxygen microsensor measurements concluded 20–70% reduction of the dissolved oxygen flux from the biofilm surface into the biofilm matrix. This decrease in oxygen availability lowered substrate conversion in biofilms exposed to high loadings of organic wastewater particles.

Journal or Publication Title: Separation and Purification Technology
Volume: 197
Uncontrolled Keywords: Particulate matter Optical coherence tomography Microsensor measurement Mass transfer
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 Engineering
Date Deposited: 08 Jan 2019 16:18
Official URL: http://www.sciencedirect.com/science/article/pii/S1383586616...
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