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Simultaneously recovering electricity and water from wastewater by osmotic microbial fuel cells: Performance and membrane fouling |
Yuqin Lu1, Xiao Bian2, Hailong Wang1, Xinhua Wang1(), Yueping Ren1, Xiufen Li1() |
1. Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China 2. School of Environment, Tsinghua University, Beijing 100084, China |
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Abstract OsMFC can simultaneously recover electricity and water from wastewater. Membrane fouling played an important role in flux decline of FO membrane in OsMFCs. Biofouling was the major fouling of the FO membrane in OsMFCs. The growth of biofouling layer on the FO membrane can be divided into three stages. Microorganisms were the dominant biofoulant in the biofouling layer. Since the concept of the osmotic microbial fuel cell (OsMFC) was introduced in 2011, it has attracted growing interests for its potential applications in wastewater treatment and energy recovery. However, forward osmosis (FO) membrane fouling resulting in a severe water flux decline remains a main obstacle. Until now, the fouling mechanisms of FO membrane especially the development of biofouling layer in the OsMFC are not yet clear. Here, the fouling behavior of FO membrane in OsMFCs was systematically investigated. The results indicated that a thick fouling layer including biofouling and inorganic fouling was existed on the FO membrane surface. Compared to the inorganic fouling, the biofouling played a more important role in the development of the fouling layer. Further analyses by the confocal laser scanning microscopy (CLSM) implied that the growth of biofouling layer on the FO membrane surface in the OsMFC could be divided into three stages. Initially, microorganisms associated with b-D-glucopyranose polysaccharides were deposited on the FO membrane surface. After that, the microorganisms grew into a biofilm caused a quick decrease of water flux. Subsequently, some of microorganisms were dead due to lack of nutrient source, in the meantime, polysaccharide and proteins in the biofouling layer were decomposed as nutrient source, thus leading to a slow development of the biofouling layer. Moreover, the microorganisms played a significant role in the formation and development of the biofouling layer, and further studies are needed to mitigate the deposition of microorganisms on FO membrane surfaces in OsMFCs.
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Keywords
Microbial fuel cell
Forward osmosis
Membrane fouling
Biofouling
Wastewater treatment
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Corresponding Author(s):
Xinhua Wang,Xiufen Li
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Issue Date: 27 June 2018
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