Enhanced nitrate reduction in water by a combined bio-electrochemical system of microbial fuel cells and submerged aquatic plant Ceratophyllum demersum

论文摘要

High nitrate（NO3-）loading in water bodies is a crucial factor inducing the eutrophication of lakes.We tried to enhance NO3-reduction in overlying water by coupling sediment microbial fuel cells（SMFCs）with submerged aquatic plant Ceratophyllum demersum.A comparative study was conducted by setting four treatments:open-circuit SMFC（Control）,closed-circuit SMFC（SMFC-c）,open-circuit SMFC with C.demersum（Plant）,and closed-circuit SMFC with C.demersum（P-SMFC-c）.The electrochemical parameters were documented to illustrate the bio-electrochemical characteristics of SMFC-c and P-SMFC-c.Removal pathways of NO3- in different treatments were studied by adding quantitative15NO3- to water column.The results showed that the cathodic reaction in SMFC-c was mainly catalyzed by aerobic organisms attached on the cathode,including algae,Pseudomonas,Bacillus,and Albidiferax.The oxygen secreted by plants significantly improved the power generation of SMFC-c.Both electrogenesis and plants enhanced the complete removal of NO3- from the sediment–water system.The complete removal rates of added15N increased by 17.6% and 10.2% for SMFC-c and plant,respectively,when compared with control at the end of experiment.The electrochemical/heterotrophic and aerobic denitrification on cathodes mainly drove the higher reduction of NO3- in SMFC-c and plant,respectively.The coexistence of electrogenesis and plants further increased the complete removal of NO3- with a rate of 23.1%.The heterotrophic and aerobic denitrifications were simultaneously promoted with a highest abundance of Flavobacterium,Bacillus,Geobacter,Pseudomonas,Rhodobacter,and Arenimonas on the cathode.

论文目录

• Introduction
• 1. Materials and methods
•   1.1. Material preparation
•   1.2. Design and construction of experimental system
•   1.3. Sampling, measurements, and calculations
•   1.4. Statistical analysis
• 2. Results and discussion
•   2.1. Physicochemical parameters changes during the operation
•   2.2. Electrochemical characteristics of SMFC and P-SMFC
•   2.3. Removal pathways of15NO3-in the open-circuit sediment–water–electrode system
•   2.4. Removal pathways of15NO3-in the closed-circuit sedi-ment–water–electrode system
•   2.5. Removal pathways of15NO3-in the open-circuit sediment–water–electrode–plant system
•   2.6. Removal pathways of15NO3-in the closed-circuit sedi-ment–water–electrode–plant system
•   2.7. An overview of the processes of NO3-removal by electrogenesis, plants, and the coupled system
• 3. Conclusions

文章来源

类型: 期刊论文

作者: Peng Xu,Enrong Xiao,Junmei Wu,Feng He,Yi Zhang,Zhenbin Wu

来源: Journal of Environmental Sciences 2019年04期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 环境科学与资源利用

单位: College of Resources and Environmental Engineering,Wuhan University of Technology,State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology,Chinese Academy of Sciences

基金: supported by the National Key Research and Development Plan of China (No. 2016YFC0500403-03),the Science and Technology Service Network Initiative of the Chinese Academy of Sciences (No. KFJ-STS-ZDTP-038)

分类号: X524

页码: 338-351

总页数: 14

文件大小: 7786K

下载量: 85