Bioelectricity Production from Citrobacter freundii GBH253 and Chlorella pyrenoidosa on Microbial Fuel Cell Anode with Different Carbon Sources
Date
2021-12-28Author
Fauzan, Irfan Anwar
Meryandini, Anja
Santosa, Dwi Andreas
Ridwan, Roni
Metadata
Show full item recordAbstract
Microbial Fuel Cell (MFC) development has significantly increased from
various aspects to get higher and more stable electricity. Developing MFC on
microorganism aspect is very important because it plays a crucial role in the MFC
system. C. freundii GBH253 is one of the potential exoelectrogen bacterium that
could be developed for the MFC system. Integrating C. freundii GBH253 and
electricity-producing microalgae, such as C. pyrenoidosa, in the anode of MFC
could get more stable and higher electricity. In this study, C. freundii GBH253 and
C. pyrenoidosa were coupled to produce electricity from different substrates. C.
freundii GBH253 and C. pyrenoidosa were tested on three different media types
before being tested on MFC. They were also examined for the co-cultivation test to
determine the symbiotic relationship between the two microorganisms. The MFC
test was conducted using the Randomized Block Design Factorial and the Tukey
test to see significant differences from each treatment. The parameters observed in
this study were voltage, power density, Chemical Oxygen Demand (COD),
Coulombic Efficiency (CE), pH, and volatile fatty acid (VFA).
C. freundii GBH253 cannot grow on microalgae medium, while C.
pyrenoidosa could grow on bacterial medium and a mixture of bacterium and
microalgae media. The bacterium gained benefit from co-culture with microalgae.
In the MFC test, electricity was generated in all treatments, which bacterium +
microalgae with acetate treatment could generate power density up to 211,97
mW/m2 and the most stable compared to others. Production of electricity in
bacterium-microalgae combination dominated by the bacterium; hence, microalgae
still help bacterium by producing electricity and raised the COD value. The pH
value of all treatments was higher than the initial pH. Acetate and phenol were VFA
produced in all treatments, whereas butyric acid and propionic acid were found in
some treatments. Pearson correlation showed that some VFA highly correlated with
power density.