PMID- 18800535
OWN - NLM
STAT- MEDLINE
DCOM- 20081024
LR  - 20190715
IS  - 0013-936X (Print)
IS  - 0013-936X (Linking)
VI  - 42
IP  - 17
DP  - 2008 Sep 1
TI  - Kinetic experiments for evaluating the Nernst-Monod model for anode-respiring 
      bacteria (ARB) in a biofilm anode.
PG  - 6593-7
AB  - Anode-respiring bacteria (ARB) are able to transfer electrons from reduced 
      substrates to a solid electrode. Previously, we developed a biofilm model based 
      on the Nernst-Monod equation to describe the anode potential losses of ARB that 
      transfer electrons through a solid conductive matrix. In this work, we develop an 
      experimental setup to demonstrate how well the Nernst-Monod equation is able to 
      represent anode potential losses in an ARB biofilm. We performed low-scan cyclic 
      voltammetry (LSCV) throughout the growth phase of an ARB biofilm on a graphite 
      electrode growing on acetate in continuous mode. The (j)V response of 9 LSCVs 
      corresponded well to the Nernst-Monod equation, and the half-saturation potential 
      (E(KA)) was -0.425 +/- 0.002 V vs Ag/AgCl at 30 degrees C (-0.155 +/- 0.002 V vs 
      SHE). Anode-potential losses from the potential of acetate reached approximately 
      0.225 V at current density saturation, and this loss was determined by our 
      microbial community's E(KA) value. The LSCVs at high current densities showed no 
      significant deviation from the Nernst-Monod ideal shape, indicating that the 
      conductivity of the biofilm matrix (kappa(bio)) was high enough (> or = 0.5 
      mS/cm) that potential loss did not affect the performance of the biofilm anode. 
      Our results confirm the applicability of the Nernst-Monod equation for a 
      conductive biofilm anode and give insights of the processes that dominate anode 
      potential losses in microbial fuel cells.
FAU - Torres, Cesar I
AU  - Torres CI
AD  - Center for Environmental Biotechnology, Biodesign Institute at Arizona State 
      University, Tempe, Arizona 85287, USA. cit@asu.edu
FAU - Marcus, Andrew Kato
AU  - Marcus AK
FAU - Parameswaran, Prathap
AU  - Parameswaran P
FAU - Rittmann, Bruce E
AU  - Rittmann BE
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
SB  - IM
MH  - Bacteria/*metabolism
MH  - *Biofilms
MH  - *Electrodes
MH  - Kinetics
MH  - *Models, Theoretical
EDAT- 2008/09/20 09:00
MHDA- 2008/10/25 09:00
CRDT- 2008/09/20 09:00
PHST- 2008/09/20 09:00 [pubmed]
PHST- 2008/10/25 09:00 [medline]
PHST- 2008/09/20 09:00 [entrez]
AID - 10.1021/es800970w [doi]
PST - ppublish
SO  - Environ Sci Technol. 2008 Sep 1;42(17):6593-7. doi: 10.1021/es800970w.