A new method to measure and model dynamic oxygen microdistributions in moving biofilms

A new method to measure and model dynamic oxygen microdistributions in moving biofilms Biofilms in natural environments offer a superior solution to mitigate water pollution. Artificially intensified biofilm reactors represented by rotating biological contactors (RBCs) are widely applied and studied. Understanding the oxygen transfer process in biofilms is an important aspect of these studies, and describing this process in moving biofilms (such as biofilms in RBCs) is a particular challenge. Oxygen transfer in RBCs behaves differently than in other biological reactors due to the special oxygen supply mode that results from alternate exposure of the biofilm to wastewater and air. The study of oxygen transfer in biofilms is indispensable for understanding biodegradation in RBCs. However, the mechanisms are still not well known due to a lack of effective tools to dynamically analyze oxygen diffusion, reaction, and microdistribution in biofilms. A new experimental device, the Oxygen Transfer Modeling Device (OTMD), was designed and manufactured for this purpose, and a mathematical model was developed to model oxygen transfer in biofilm produced by an RBC. This device allowed the simulation of the local environment around the biofilm during normal RBC operation, and oxygen concentrations varying with time and depth in biofilm were measured using an oxygen microelectrode. The experimental data conformed well to the model description, indicating that the OTMD and the model were stable and reliable. Moreover, the OTMD offered a flexible approach to study the impact of a single-factor on oxygen transfer in moving biofilms.In situ environment of biofilm in an RBC was simulated, and dynamic oxygen microdistributions in the biofilm were measured and well fitted to the built model description. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Pollution Elsevier

A new method to measure and model dynamic oxygen microdistributions in moving biofilms

A new method to measure and model dynamic oxygen microdistributions in moving biofilms

Environmental Pollution 229 (2017) 199e209 Contents lists available at ScienceDirect Environmental Pollution journal homepage: www.elsevier.com/locate/envpol A new method to measure and model dynamic oxygen microdistributions in moving biofilms a a, b, * b a b, ** Jian-Hui Wang , You-Peng Chen , Yang Dong , Xi-Xi Wang , Jin-Song Guo , b, c b a a a d Yu Shen , Peng Yan , Teng-Fei Ma , Xiu-Qian Sun , Fang Fang , Jing Wang Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE, Chongqing University, Chongqing 400045, China Key Laboratory of Reservoir Aquatic Environment of CAS, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China National Base of International Science and Technology Cooperation for Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing 400067, China Chongqing Jianzhu College, Chongqing 400072, China art i cle i nfo abstract Article history: Biofilms in natural environments offer a superior solution to mitigate water pollution. Artificially Received 13 November 2016 intensified biofilm reactors represented by rotating biological contactors (RBCs) are widely applied and Received in revised form studied. Understanding the oxygen transfer process in biofilms is an important aspect of these studies, 11 April 2017 and describing this process in moving biofilms (such as biofilms in RBCs) is a particular challenge. Ox- Accepted 18 May 2017 ygen transfer in RBCs behaves differently than in other biological reactors due to the special oxygen Available online 6 June 2017 supply mode that results from alternate exposure of the biofilm to wastewater and air. The study of oxygen transfer in biofilms is indispensable for understanding biodegradation in RBCs. However, the Keywords: mechanisms are still not well known due to a lack of effective tools to dynamically analyze oxygen Wastewater treatment diffusion, reaction, and...
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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier Ltd
ISSN
0269-7491
D.O.I.
10.1016/j.envpol.2017.05.062
Publisher site
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Abstract

Biofilms in natural environments offer a superior solution to mitigate water pollution. Artificially intensified biofilm reactors represented by rotating biological contactors (RBCs) are widely applied and studied. Understanding the oxygen transfer process in biofilms is an important aspect of these studies, and describing this process in moving biofilms (such as biofilms in RBCs) is a particular challenge. Oxygen transfer in RBCs behaves differently than in other biological reactors due to the special oxygen supply mode that results from alternate exposure of the biofilm to wastewater and air. The study of oxygen transfer in biofilms is indispensable for understanding biodegradation in RBCs. However, the mechanisms are still not well known due to a lack of effective tools to dynamically analyze oxygen diffusion, reaction, and microdistribution in biofilms. A new experimental device, the Oxygen Transfer Modeling Device (OTMD), was designed and manufactured for this purpose, and a mathematical model was developed to model oxygen transfer in biofilm produced by an RBC. This device allowed the simulation of the local environment around the biofilm during normal RBC operation, and oxygen concentrations varying with time and depth in biofilm were measured using an oxygen microelectrode. The experimental data conformed well to the model description, indicating that the OTMD and the model were stable and reliable. Moreover, the OTMD offered a flexible approach to study the impact of a single-factor on oxygen transfer in moving biofilms.In situ environment of biofilm in an RBC was simulated, and dynamic oxygen microdistributions in the biofilm were measured and well fitted to the built model description.

Journal

Environmental PollutionElsevier

Published: Oct 1, 2017

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