title: Effects of applied potential on phosphine formation in synthetic wastewater treatment by Microbial Electrolysis Cell (MEC).
abstract: Phosphine (PH3) emission from conventional biological wastewater treatment is very inefficient (ng-μg m-3). In this work, we investigated the feasibility of promoting PH3formation from inorganic phosphorus (IP) or organic phosphorus (OP) containing synthetic wastewater treatment by Microbial Electrolysis Cell (MEC) for the first time. Positive effect of applied potential on PH3production was observed after methanogens was inhibited. The highest production of PH3(1103.10 ± 72.02 ng m-3) was obtained in IP-fed MEC operated at -0.6 V, which was about 5-fold and 2-fold compared to that in open circuit experiment and OP-fed MEC, respectively. Meanwhile, PH3formation corresponded positively with current density and alkaline phosphatase activity. This result showed that suitable potential could enhance the activity of relevant enzymes and boost the biosynthesis of PH3. Bacterial communities analysis based on high-throughput sequencing revealed that applied potential was conductive to the enrichment of phosphate-reducing organisms in contrast to the control test. These results provide a new idea for resource utilization of phosphorus in wastewater.
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou 510640, China. Electronic address: xjniu@scut.edu.cn.
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Niu
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
authors.forename: Weiyi
authors.initials: W
authors.lastname: Chen
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
authors.forename: Shaorong
authors.initials: S
authors.lastname: An
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Sheng
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D001674:Bioelectric Energy Sources / Q000382:microbiology*; D057919:Biological Oxygen Demand Analysis; D004572:Electrolysis / Q000295:instrumentation*; D010720:Phosphines / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D010720:Phosphines; D062065:Wastewater; C044646:phosphine
keywords: Enzyme activity; Methane; Microbial Electrolysis Cell; Phosphine