Novel trickling microbial fuel cells for electricity generation from wastewater

被引：15

作者：

Gao N. ^{[1
]}

Fan Y. ^{[2
]}

Long F. ^{[1
]}

Qiu Y. ^{[3
]}

Geier W. ^{[1
]}

Liu H. ^{[1
]}

机构：

[1] Department of Biological and Ecological Engineering, Oregon State University, Corvallis, 97331, OR

[2] Waste2Watergy LLC, 3830 NW Boxwood Dr., Corvallis, 97330, OR

[3] Department of Mechanical Engineering, Oregon State University, Corvallis, 97331, OR

来源：

Chemosphere | 2020年 / 248卷

基金：

美国国家科学基金会;

关键词：

Cathode flooding; Hydraulic pressure; Microbial fuel cell; Trickling operation; Wastewater treatment;

D O I：

10.1016/j.chemosphere.2020.126058

中图分类号：

学科分类号：

摘要：

There are two main challenges associated with the scale-up of air-cathode microbial fuel cells (MFCs): performance reduction and cathode leakage/flooding. In this study, a novel 13.4 L reactor that contains 4 tubular MFCs was designed and operated in a trickling mode for 65 days under different conditions. The trickling water flow through the horizontally aligned MFCs alleviated the hydraulic pressure applied to the air-cathodes. With a total cathode working area of over 1700 cm2, this reactor generated power densities up to 1 W/m2 with coulombic efficiencies over 50% using acetate. Using a brewery waste stream as carbon source, an average power density of 0.27 W/m2 was generated with ∼60% COD removal at hydraulic retention time of 1.6 h. The decent performance of this reactor compared with other air-cathode MFCs at the similar scale and the alleviated hydraulic pressure on air-cathodes demonstrate the great potential of this design and operation for future MFC optimization and scaling up. © 2020 Elsevier Ltd

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