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Promoted bioelectrocatalytic activity of microbial electrolysis cell (MEC) in sulfate removal through the synergy between neutral red and graphite felt
- Source :
- Chemical Engineering Journal. 327:183-192
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- The recent thrust in utilizing microbial electrolysis cell (MEC) has led to accelerated attention in environmental decontamination. One key factor that governs this process is electron transfer efficiency. In this study, neutral red (NR) is involved as electron transfer mediator to investigate whether it could contribute to MEC performance. Afterwards, influence of electrode material selection on NR addition system was also studied. The results indicate MEC with NR shows better electrochemistry activity, which means sulfate-reducing bacteria (SRB) can response to electron transfer mediator NR. Further study reveals graphite felt triggers a better synergy with NR to facilitate electron utilization efficiency of the system subsequently maintains bacteria metabolic activity for a longer time. Sulfate removal in this reactor reaches 79.0% with electron utilization efficiency of 54.2%. To explore the mechanism, electrode bioelectrochemical property, microorganism activity and community were investigated. Electrode morphology analysis confirms graphite felt affords abundant space for the growth of electroactive microorganisms especially SRB and promotes electron exchange through cooperating with NR, which fits in with electrochemical impedance spectroscopy (EIS) analysis. High-throughput sequencing analysis confirms improved reactor can fortify the population dominant of SRB in the community which greatly raises electron utilization efficiency of SRB.
- Subjects :
- Neutral red
education.field_of_study
Chemistry
General Chemical Engineering
Population
02 engineering and technology
General Chemistry
010501 environmental sciences
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
Industrial and Manufacturing Engineering
Dielectric spectroscopy
chemistry.chemical_compound
Electron transfer
Chemical engineering
Electrode
Microbial electrolysis cell
Environmental Chemistry
Graphite
0210 nano-technology
education
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 13858947
- Volume :
- 327
- Database :
- OpenAIRE
- Journal :
- Chemical Engineering Journal
- Accession number :
- edsair.doi...........38836531ebb1be581b4c0da83c6de965