TY - JOUR
T1 - Effect of external resistance on microbial electrochemical desalination, sewage treatment, power and resource recovery
AU - Al-Mamun, Abdullah
N1 - Funding Information:
We are gratitude to Mr. Marshal Phillis and Mr. Abdullah Al Omarani for the mechanical support during construction of MDC. Thanks to Dr. Sanket Joshi and Mr. Sajjad to support us in operating the equipment used for analyses. Thanks to Haya Water Company (operator of STPs in Muscat, Oman) for providing sewage samples. Dr. Tahereh Jafary and Prof. Mahad Baawain assist in proof-reading. The project was financially supported by His Majesty’s Trust Fund (SR/ENG/CAED/17/01) and TRC fund (RC/RG/ENG/CAED/19/01), Sultanate of Oman.
Publisher Copyright:
© 2021
PY - 2022/2/1
Y1 - 2022/2/1
N2 - Microbial desalination cell (MDC) has attracted attention as an eco-friendly technology to treat sewage and seawater with concurrent recovery of bioelectricity. External resistance (Rext) is one of the main factors that control it's performances. This study optimized the performance of an MDC for removing COD and salinity at five different Rext of 150, 100, 50, 25, and 10 Ω. Columbic efficiency (CE) was measured to find the best Rext for MDC operation. Voltage polarization demonstrated that the MDC possessed an internal resistance (Rint) of 25–30 Ω and maximum power recovery of 302.25 mW/m2. The highest and lowest recovery of stable electricity was 20.7 mA and 3.6 mA at Rext of 10 and 150 Ω, respectively. The COD removal increased from 21% at Rext of 25 Ω to 57% at Rext of 150 Ω. The CE decreased from 58.3% to 4.32% with the gradual increase of Rext from 25 to 150 Ω suggesting the dominancy of exoelectrogens in biofilm at Rext ≤ Rint. The achieved desalination rate was 47% and 18% at Rext of 10 and 25 Ω, respectively. The performances of investigated MDC showed a great potential for recovering electricity with significant removal of organics from domestic sewage and salt from seawater.
AB - Microbial desalination cell (MDC) has attracted attention as an eco-friendly technology to treat sewage and seawater with concurrent recovery of bioelectricity. External resistance (Rext) is one of the main factors that control it's performances. This study optimized the performance of an MDC for removing COD and salinity at five different Rext of 150, 100, 50, 25, and 10 Ω. Columbic efficiency (CE) was measured to find the best Rext for MDC operation. Voltage polarization demonstrated that the MDC possessed an internal resistance (Rint) of 25–30 Ω and maximum power recovery of 302.25 mW/m2. The highest and lowest recovery of stable electricity was 20.7 mA and 3.6 mA at Rext of 10 and 150 Ω, respectively. The COD removal increased from 21% at Rext of 25 Ω to 57% at Rext of 150 Ω. The CE decreased from 58.3% to 4.32% with the gradual increase of Rext from 25 to 150 Ω suggesting the dominancy of exoelectrogens in biofilm at Rext ≤ Rint. The achieved desalination rate was 47% and 18% at Rext of 10 and 25 Ω, respectively. The performances of investigated MDC showed a great potential for recovering electricity with significant removal of organics from domestic sewage and salt from seawater.
KW - Acid production
KW - Chemical recovery
KW - Desalination rate
KW - External resistance
KW - Microbial desalination cell
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U2 - 10.1016/j.seta.2021.101718
DO - 10.1016/j.seta.2021.101718
M3 - Article
AN - SCOPUS:85118847310
SN - 2213-1388
VL - 49
JO - Sustainable Energy Technologies and Assessments
JF - Sustainable Energy Technologies and Assessments
M1 - 101718
ER -
