Baranitharan E | Universiti Malaysia Pahang (UMP) (original) (raw)
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Kwame Nkrumah University of Science and Technology
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Enhancing the anode performance is a critical step for improving the power output of MFCs. This s... more Enhancing the anode performance is a critical step for improving the power output of MFCs. This study
deals with the dual chamber MFCs to increase the power generation using the controlled inoculum in
Palm oil mill effluent (POME). Controlled inoculum (CI) was made using the predominant microorganisms
such as Pseudomonas aeruginosa, Azospira oryzae, Acetobacter peroxydans and Solimonas variicoloris
isolated from palm oil anaerobic sludge (AS) as well as from biofilm of MFC anode operated with AS
and identified using BIOLOG gene III analysis, PCR, DGGE and sequencing. Biofilm formation on electrode
was investigated by Fourier Transform Infrared spectroscopy (FTIR) and Thermogravimetric analayis
(TGA). The MFC operated with Polyacrylonitrile carbon felt (PACF) anode and CI reached the maximum
power density of 107.35 mW/m2, which was two times higher as compared to MFC operated with usual
anaerobic sludge as inoculum. The maximum coulombic efficiency (CE) of 74% was achieved from the
MFC with CI, which was 50% higher than the CE with anaerobic sludge. But, it showed lower COD removal
efficiency of about 32%, which might be due to the absence of required fermentative microorganisms in CI
to utilize POME. The electrochemical activities have been investigated by electrochemical impedance
spectroscopy (EIS). EIS and the simulated results showed the significant reduction of charge transfer
resistance (Rct) by 40% during the operation of the cell with CI. EIS results provided evidence that there
was a substantial improvement in electron transfer between the microorganisms and the anode with CI.
These results demonstrate that the power output of MFCs can be increased significantly using CI.
Anode biofilm is a crucial component in microbial fuel cells (MFCs) for electrogenesis. Better kn... more Anode biofilm is a crucial component in
microbial fuel cells (MFCs) for electrogenesis. Better
knowledge about the biofilm development process on
electrode surface is believed to improve MFC performance.
In this study, double-chamber microbial fuel cell was
operated with diluted POME (initial COD = 1,000 mg L-1
) and polyacrylonitrile carbon felt was used as
electrode. The maximum power density, COD removal
efficiency and Coulombic efficiency were found as
22 mW m-2, 70 and 24 %, respectively. FTIR and TGA
analysis confirmed the formation of biofilm on the elec-
trode surface during MFC operation. The impact of anode
biofilm on anodic polarization resistance was investigated
using electrochemical impedance spectroscopy (EIS) and
microbial community changes during MFC operation using
denaturing gradient gel electrophoresis (DGGE). The EIS-
simulated results showed the reduction of charge transfer
resistance (Rct) by 16.9 % after 14 days of operation of the
cell, which confirms that the development of the microbial
biofilm on the anode decreases the Rct and therefore
improves power generation. DGGE analysis showed the
variation in the biofilm composition during the biofilm
growth until it forms an initial stable microbial community,
thereafter the change in the diversity would be less. The
power density showed was directly dependent on the bio-
film development and increased significantly during the
initial biofilm development period. Furthermore, DGGE
patterns obtained from 7th and 14th day suggest the pre-
sence of less diversity and probable functional redundancy
within the anodic communities possibly responsible for the
stable MFC performance in changing environmental
conditions.
Palm oil mill effluent (POME) is an organic waste material produced at the oil palm mills.... more Palm oil mill effluent (POME) is an organic waste material produced at the oil palm mills. In its raw form, POME is highly polluting due to its high content of biological and chemical oxygen demand. In the present paper, POME was treated using double chamber microbial fuel cell with simultaneous generation of electricity. Polyacrylonitrile carbon felt (PACF) was used as electrode throughout the MFC experiments. Various dilutions of raw POME were used to analyze the MFC power generation, COD removal efficiency and coulombic efficiency. Anaerobic sludge was used as inoculum for all the MFC experiments. Since, this inoculum originated from POME it showed higher potential to generate bioenergy from complex POME. Anaerobic sludge enhanced the power production due to better utilization of substrates by various types of microorganisms present in it. Among the raw POME and different concentrations of POME used, the PACF with raw POME showed the maximum power density and volumetric power density of about 45mW/m2 and 304mW/m3¬ respectively but it showed low coulombic efficiency and low COD removal efficiency of about 0.8% and 45% respectively. The MFC PACF with 1:50 dilution showed higher COD removal efficiency and coulombic efficiency of about 70% and 24% but showed low power density and low volumetric power density of about 22mW/m2 and 149mW/m3¬ respectively. The formation of biofilm onto the electrode surface has been confirmed from scanning electron microscopy (SEM) experiments. The results show that MFC possesses great potential for the simultaneous treatment of POME and power generation using PACF as electrode.
Enhancing the anode performance is a critical step for improving the power output of MFCs. This s... more Enhancing the anode performance is a critical step for improving the power output of MFCs. This study
deals with the dual chamber MFCs to increase the power generation using the controlled inoculum in
Palm oil mill effluent (POME). Controlled inoculum (CI) was made using the predominant microorganisms
such as Pseudomonas aeruginosa, Azospira oryzae, Acetobacter peroxydans and Solimonas variicoloris
isolated from palm oil anaerobic sludge (AS) as well as from biofilm of MFC anode operated with AS
and identified using BIOLOG gene III analysis, PCR, DGGE and sequencing. Biofilm formation on electrode
was investigated by Fourier Transform Infrared spectroscopy (FTIR) and Thermogravimetric analayis
(TGA). The MFC operated with Polyacrylonitrile carbon felt (PACF) anode and CI reached the maximum
power density of 107.35 mW/m2, which was two times higher as compared to MFC operated with usual
anaerobic sludge as inoculum. The maximum coulombic efficiency (CE) of 74% was achieved from the
MFC with CI, which was 50% higher than the CE with anaerobic sludge. But, it showed lower COD removal
efficiency of about 32%, which might be due to the absence of required fermentative microorganisms in CI
to utilize POME. The electrochemical activities have been investigated by electrochemical impedance
spectroscopy (EIS). EIS and the simulated results showed the significant reduction of charge transfer
resistance (Rct) by 40% during the operation of the cell with CI. EIS results provided evidence that there
was a substantial improvement in electron transfer between the microorganisms and the anode with CI.
These results demonstrate that the power output of MFCs can be increased significantly using CI.
Anode biofilm is a crucial component in microbial fuel cells (MFCs) for electrogenesis. Better kn... more Anode biofilm is a crucial component in
microbial fuel cells (MFCs) for electrogenesis. Better
knowledge about the biofilm development process on
electrode surface is believed to improve MFC performance.
In this study, double-chamber microbial fuel cell was
operated with diluted POME (initial COD = 1,000 mg L-1
) and polyacrylonitrile carbon felt was used as
electrode. The maximum power density, COD removal
efficiency and Coulombic efficiency were found as
22 mW m-2, 70 and 24 %, respectively. FTIR and TGA
analysis confirmed the formation of biofilm on the elec-
trode surface during MFC operation. The impact of anode
biofilm on anodic polarization resistance was investigated
using electrochemical impedance spectroscopy (EIS) and
microbial community changes during MFC operation using
denaturing gradient gel electrophoresis (DGGE). The EIS-
simulated results showed the reduction of charge transfer
resistance (Rct) by 16.9 % after 14 days of operation of the
cell, which confirms that the development of the microbial
biofilm on the anode decreases the Rct and therefore
improves power generation. DGGE analysis showed the
variation in the biofilm composition during the biofilm
growth until it forms an initial stable microbial community,
thereafter the change in the diversity would be less. The
power density showed was directly dependent on the bio-
film development and increased significantly during the
initial biofilm development period. Furthermore, DGGE
patterns obtained from 7th and 14th day suggest the pre-
sence of less diversity and probable functional redundancy
within the anodic communities possibly responsible for the
stable MFC performance in changing environmental
conditions.
Palm oil mill effluent (POME) is an organic waste material produced at the oil palm mills.... more Palm oil mill effluent (POME) is an organic waste material produced at the oil palm mills. In its raw form, POME is highly polluting due to its high content of biological and chemical oxygen demand. In the present paper, POME was treated using double chamber microbial fuel cell with simultaneous generation of electricity. Polyacrylonitrile carbon felt (PACF) was used as electrode throughout the MFC experiments. Various dilutions of raw POME were used to analyze the MFC power generation, COD removal efficiency and coulombic efficiency. Anaerobic sludge was used as inoculum for all the MFC experiments. Since, this inoculum originated from POME it showed higher potential to generate bioenergy from complex POME. Anaerobic sludge enhanced the power production due to better utilization of substrates by various types of microorganisms present in it. Among the raw POME and different concentrations of POME used, the PACF with raw POME showed the maximum power density and volumetric power density of about 45mW/m2 and 304mW/m3¬ respectively but it showed low coulombic efficiency and low COD removal efficiency of about 0.8% and 45% respectively. The MFC PACF with 1:50 dilution showed higher COD removal efficiency and coulombic efficiency of about 70% and 24% but showed low power density and low volumetric power density of about 22mW/m2 and 149mW/m3¬ respectively. The formation of biofilm onto the electrode surface has been confirmed from scanning electron microscopy (SEM) experiments. The results show that MFC possesses great potential for the simultaneous treatment of POME and power generation using PACF as electrode.