ramesh kakarla | Kyung Hee University (original) (raw)
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Politeknik Negeri Banyuwangi
National University of Sciences & Technology (NUST)
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Papers by ramesh kakarla
Microbial fuel cells (MFCs) have received attention as a promising renewable energy technology fo... more Microbial fuel cells (MFCs) have received
attention as a promising renewable energy technology for
waste treatment and energy recovery. We tested a submersible
MFC with an innovative design capable of generating
a stable voltage of 0.250 ± 0.008 V (with a fixed
470 X resistor) directly from primary sludge. In a polarization
test, the maximum power density was 0.18 W/m2 at
a current density of 0.8 A/m2 with an external resistor of
300 X. The anodic solution of the primary sludge needs to
be adjusted to a pH 7 for high power generation. The
modified primary sludge with an added phosphate buffer
prolonged the current generation and increased the power
density by 7 and 1.5 times, respectively, in comparison
with raw primary sludge. These findings suggest that
energy recovery from primary sludge can be maximized
using an advanced MFC system with optimum conditions.
Microbial fuel cell (MFC) and its cathode performances were compared with use of carbon fiber bru... more Microbial fuel cell (MFC) and its cathode performances were compared with use of carbon fiber brush and plain carbon paper cathode electrodes in algae aeration. The MFC having carbon fiber brush cathode exhibited a voltage of 0.21 ± 0.01 V (1,000 X) with a cathode potential of around -0.14 ± 0.01 V in algal aeration, whereas MFC with plain carbon paper cathode resulted in a voltage of 0.06 ± 0.005 V with a cathode potential of -0.39 ± 0.01 V. During polarizations, MFC equipped with carbon fiber brush cathode showed a maximum power density of 30 mW/m 2 , whereas the MFC equipped with plain carbon paper showed a power density of 4.6 mW/m 2 . In algae aeration, the internal resistance with carbon fiber brush cathode was 804 X and with plain carbon paper it was 1,210 X. The peak currents of MFC operation with carbon fiber brush and plain carbon paper cathodes were -31 mA and -850 lA, respectively.
Dissolved oxygen Cell potential a b s t r a c t Photoautotrophic algae Scenedismus obliquus could... more Dissolved oxygen Cell potential a b s t r a c t Photoautotrophic algae Scenedismus obliquus could attach on the surface of a cathode electrode and produced oxygen for electricity generation in microbial fuel cell (MFC). Oxygen concentration by algae aeration in the cathode chamber increased from 0 to 15.7 mg/l within 12-h, and a voltage generation of 0.47 AE 0.03 V was obtained with 1000 U external resistance. In polarization test, MFC with algal aeration exhibited the maximum power density of 153 mW/m 2 , which was 32% higher than the value (116 mW/m 2 ) with mechanical aeration at oxygen concentration of 5.9 mg/l. The internal resistance of MFC with algal aeration decreased in ohmic resistance (5.9e5.2 U) and charge transfer resistance (9.6 e7.2 U) over 72-h operation. Cyclic voltammetry of cathode during algal aeration revealed higher reduction current of À9.3 mA compared to mechanical aeration (À4.7 mA).
Microbial fuel cells (MFCs) have received attention as a promising renewable energy technology fo... more Microbial fuel cells (MFCs) have received
attention as a promising renewable energy technology for
waste treatment and energy recovery. We tested a submersible
MFC with an innovative design capable of generating
a stable voltage of 0.250 ± 0.008 V (with a fixed
470 X resistor) directly from primary sludge. In a polarization
test, the maximum power density was 0.18 W/m2 at
a current density of 0.8 A/m2 with an external resistor of
300 X. The anodic solution of the primary sludge needs to
be adjusted to a pH 7 for high power generation. The
modified primary sludge with an added phosphate buffer
prolonged the current generation and increased the power
density by 7 and 1.5 times, respectively, in comparison
with raw primary sludge. These findings suggest that
energy recovery from primary sludge can be maximized
using an advanced MFC system with optimum conditions.
Microbial fuel cell (MFC) and its cathode performances were compared with use of carbon fiber bru... more Microbial fuel cell (MFC) and its cathode performances were compared with use of carbon fiber brush and plain carbon paper cathode electrodes in algae aeration. The MFC having carbon fiber brush cathode exhibited a voltage of 0.21 ± 0.01 V (1,000 X) with a cathode potential of around -0.14 ± 0.01 V in algal aeration, whereas MFC with plain carbon paper cathode resulted in a voltage of 0.06 ± 0.005 V with a cathode potential of -0.39 ± 0.01 V. During polarizations, MFC equipped with carbon fiber brush cathode showed a maximum power density of 30 mW/m 2 , whereas the MFC equipped with plain carbon paper showed a power density of 4.6 mW/m 2 . In algae aeration, the internal resistance with carbon fiber brush cathode was 804 X and with plain carbon paper it was 1,210 X. The peak currents of MFC operation with carbon fiber brush and plain carbon paper cathodes were -31 mA and -850 lA, respectively.
Dissolved oxygen Cell potential a b s t r a c t Photoautotrophic algae Scenedismus obliquus could... more Dissolved oxygen Cell potential a b s t r a c t Photoautotrophic algae Scenedismus obliquus could attach on the surface of a cathode electrode and produced oxygen for electricity generation in microbial fuel cell (MFC). Oxygen concentration by algae aeration in the cathode chamber increased from 0 to 15.7 mg/l within 12-h, and a voltage generation of 0.47 AE 0.03 V was obtained with 1000 U external resistance. In polarization test, MFC with algal aeration exhibited the maximum power density of 153 mW/m 2 , which was 32% higher than the value (116 mW/m 2 ) with mechanical aeration at oxygen concentration of 5.9 mg/l. The internal resistance of MFC with algal aeration decreased in ohmic resistance (5.9e5.2 U) and charge transfer resistance (9.6 e7.2 U) over 72-h operation. Cyclic voltammetry of cathode during algal aeration revealed higher reduction current of À9.3 mA compared to mechanical aeration (À4.7 mA).