Abstract

This study assessed the conductivity of a Geobacter-enriched biofilm anode in a microbial electrochemical cell (MxC) equipped with two gold anodes (25 mM acetate medium), as different proton gradients were built throughout the biofilm. There was no pH gradient across the biofilm anode at 100 mM phosphate buffer (current density 2.38 A/m2) and biofilm conductivity (Kbio) was as high as 0.87 mS/cm. In comparison, an inner biofilm became acidic at 2.5 mM phosphate buffer in which dead cells were accumulated at ∼80 μm of the inner biofilm anode. At this low phosphate buffer, Kbio significantly decreased by 0.27 mS/cm, together with declined current density of 0.64 A/m2. This work demonstrates that biofilm conductivity depends on the composition of live and dead cells in the conductive biofilm anode.

Original languageEnglish (US)
Pages (from-to)230-238
Number of pages9
JournalWater Research
Volume127
DOIs
StatePublished - Dec 15 2017

Fingerprint

Biofilms
microbial activity
electrical conductivity
biofilm
Anodes
Phosphates
conductivity
phosphate
density current
Current density
Electrochemical cells
Electric Conductivity
acetate
Protons
gold
Gold
Chemical analysis

Keywords

  • Acidic biofilm
  • Biofilm anode
  • Biofilm conductivity
  • Extracellular electron transfer
  • Microbial electrochemical cell

ASJC Scopus subject areas

  • Ecological Modeling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

Cite this

Dhar, B. R., Sim, J., Ryu, H., Ren, H., Santo Domingo, J. W., Chae, J., & Lee, H. S. (2017). Microbial activity influences electrical conductivity of biofilm anode. Water Research, 127, 230-238. https://doi.org/10.1016/j.watres.2017.10.028

Microbial activity influences electrical conductivity of biofilm anode. / Dhar, Bipro Ranjan; Sim, Junyoung; Ryu, Hodon; Ren, Hao; Santo Domingo, Jorge W.; Chae, Junseok; Lee, Hyung Sool.

In: Water Research, Vol. 127, 15.12.2017, p. 230-238.

Research output: Contribution to journalArticle

Dhar, BR, Sim, J, Ryu, H, Ren, H, Santo Domingo, JW, Chae, J & Lee, HS 2017, 'Microbial activity influences electrical conductivity of biofilm anode', Water Research, vol. 127, pp. 230-238. https://doi.org/10.1016/j.watres.2017.10.028
Dhar, Bipro Ranjan ; Sim, Junyoung ; Ryu, Hodon ; Ren, Hao ; Santo Domingo, Jorge W. ; Chae, Junseok ; Lee, Hyung Sool. / Microbial activity influences electrical conductivity of biofilm anode. In: Water Research. 2017 ; Vol. 127. pp. 230-238.
@article{a13c60c6567f40d194d8b68270a27c2d,
title = "Microbial activity influences electrical conductivity of biofilm anode",
abstract = "This study assessed the conductivity of a Geobacter-enriched biofilm anode in a microbial electrochemical cell (MxC) equipped with two gold anodes (25 mM acetate medium), as different proton gradients were built throughout the biofilm. There was no pH gradient across the biofilm anode at 100 mM phosphate buffer (current density 2.38 A/m2) and biofilm conductivity (Kbio) was as high as 0.87 mS/cm. In comparison, an inner biofilm became acidic at 2.5 mM phosphate buffer in which dead cells were accumulated at ∼80 μm of the inner biofilm anode. At this low phosphate buffer, Kbio significantly decreased by 0.27 mS/cm, together with declined current density of 0.64 A/m2. This work demonstrates that biofilm conductivity depends on the composition of live and dead cells in the conductive biofilm anode.",
keywords = "Acidic biofilm, Biofilm anode, Biofilm conductivity, Extracellular electron transfer, Microbial electrochemical cell",
author = "Dhar, {Bipro Ranjan} and Junyoung Sim and Hodon Ryu and Hao Ren and {Santo Domingo}, {Jorge W.} and Junseok Chae and Lee, {Hyung Sool}",
year = "2017",
month = "12",
day = "15",
doi = "10.1016/j.watres.2017.10.028",
language = "English (US)",
volume = "127",
pages = "230--238",
journal = "Water Research",
issn = "0043-1354",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Microbial activity influences electrical conductivity of biofilm anode

AU - Dhar, Bipro Ranjan

AU - Sim, Junyoung

AU - Ryu, Hodon

AU - Ren, Hao

AU - Santo Domingo, Jorge W.

AU - Chae, Junseok

AU - Lee, Hyung Sool

PY - 2017/12/15

Y1 - 2017/12/15

N2 - This study assessed the conductivity of a Geobacter-enriched biofilm anode in a microbial electrochemical cell (MxC) equipped with two gold anodes (25 mM acetate medium), as different proton gradients were built throughout the biofilm. There was no pH gradient across the biofilm anode at 100 mM phosphate buffer (current density 2.38 A/m2) and biofilm conductivity (Kbio) was as high as 0.87 mS/cm. In comparison, an inner biofilm became acidic at 2.5 mM phosphate buffer in which dead cells were accumulated at ∼80 μm of the inner biofilm anode. At this low phosphate buffer, Kbio significantly decreased by 0.27 mS/cm, together with declined current density of 0.64 A/m2. This work demonstrates that biofilm conductivity depends on the composition of live and dead cells in the conductive biofilm anode.

AB - This study assessed the conductivity of a Geobacter-enriched biofilm anode in a microbial electrochemical cell (MxC) equipped with two gold anodes (25 mM acetate medium), as different proton gradients were built throughout the biofilm. There was no pH gradient across the biofilm anode at 100 mM phosphate buffer (current density 2.38 A/m2) and biofilm conductivity (Kbio) was as high as 0.87 mS/cm. In comparison, an inner biofilm became acidic at 2.5 mM phosphate buffer in which dead cells were accumulated at ∼80 μm of the inner biofilm anode. At this low phosphate buffer, Kbio significantly decreased by 0.27 mS/cm, together with declined current density of 0.64 A/m2. This work demonstrates that biofilm conductivity depends on the composition of live and dead cells in the conductive biofilm anode.

KW - Acidic biofilm

KW - Biofilm anode

KW - Biofilm conductivity

KW - Extracellular electron transfer

KW - Microbial electrochemical cell

UR - http://www.scopus.com/inward/record.url?scp=85031777616&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85031777616&partnerID=8YFLogxK

U2 - 10.1016/j.watres.2017.10.028

DO - 10.1016/j.watres.2017.10.028

M3 - Article

C2 - 29055828

AN - SCOPUS:85031777616

VL - 127

SP - 230

EP - 238

JO - Water Research

JF - Water Research

SN - 0043-1354

ER -