Factors affecting the performance of a single-chamber microbial fuel cell-type biological oxygen demand sensor.
Microbial fuel cells (MFCs) are devices that exploit microorganisms as biocatalysts to degrade organic matter or sludge present in wastewater (WW), and thereby generate electricity. We developed a simple, low-cost single-chamber microbial fuel cell (SCMFC)-type biochemical oxygen demand (BOD) sensor using carbon felt (anode) and activated sludge, and demonstrated its feasibility in the construction of a real-time BOD measurement system. Further, the effects of anodic pH and organic concentration on SCMFC performance were examined, and the correlation between BOD concentration and its response time was analyzed. Our results demonstrated that the SCMFC exhibited a stable voltage after 132 min following the addition of synthetic WW (BOD concentration: 200 mg/L). Notably, the response signal increased with an increase in BOD concentration (range: 5-200 mg/L) and was found to be directly proportional to the substrate concentration. However, at higher BOD concentrations (>120 mg/L) the response signal remained unaltered. Furthermore, we optimized the SCMFC using synthetic WW, and tested it with real WW. Upon feeding real WW, the BOD values exhibited a standard deviation from 2.08 to 8.3% when compared to the standard BOD5 method, thus demonstrating the practical applicability of the developed system to real treatment effluents.
School of Environmental Science and Technology, State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China E-mail: chen@tju.edu.cn.
Gai-Xiu
GX
Yang
Yong-Ming
YM
Sun
Xiao-Ying
XY
Kong
Feng
F
Zhen
Ying
Y
Li
Lian-Hua
LH
Li
Ting-Zhou
TZ
Lei
Zhen-Hong
ZH
Yuan
Guan-Yi
GY
Chen
D001674:Bioelectric Energy Sources / Q000191:economics / Q000382:microbiology; D057919:Biological Oxygen Demand Analysis / Q000191:economics / Q000295:instrumentation / Q000379:methods*; D015374:Biosensing Techniques / Q000191:economics / Q000295:instrumentation / Q000379:methods*; D004560:Electricity; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D012722:Sewage / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*
D012722:Sewage; D062065:Wastewater