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An MFC-based online monitoring and alert system for activated sludge process.

Xu GH, Wang YK, Sheng GP, Mu Y, Yu HQ - Sci Rep (2014)

Bottom Line: Such a submersible MFC utilized organic substrates and oxygen in the AS reactor as the electron donor and acceptor respectively, and could provide an evaluation on the status of the AS reactor and thus give a reliable early warning of potential risks.The results indicate that this online monitoring and alert system was highly sensitive to the performance variations of the AS reactor.The stability, sensitivity and repeatability of this online system provide feasibility of being incorporated into current control systems of wastewater treatment plants to real-time monitor, diagnose, alert and control the AS process.

View Article: PubMed Central - PubMed

Affiliation: 1] CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China [2] Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China.

ABSTRACT
In this study, based on a simple, compact and submersible microbial fuel cell (MFC), a novel online monitoring and alert system with self-diagnosis function was established for the activated sludge (AS) process. Such a submersible MFC utilized organic substrates and oxygen in the AS reactor as the electron donor and acceptor respectively, and could provide an evaluation on the status of the AS reactor and thus give a reliable early warning of potential risks. In order to evaluate the reliability and sensitivity of this online monitoring and alert system, a series of tests were conducted to examine the response of this system to various shocks imposed on the AS reactor. The results indicate that this online monitoring and alert system was highly sensitive to the performance variations of the AS reactor. The stability, sensitivity and repeatability of this online system provide feasibility of being incorporated into current control systems of wastewater treatment plants to real-time monitor, diagnose, alert and control the AS process.

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Schematic of the MFC-based online monitoring and alert system.
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f5: Schematic of the MFC-based online monitoring and alert system.

Mentions: The established online monitoring and alert system included three parts: a single-chamber MFC, a signal acquisition subsystem and an alert subsystem with self-diagnosis function (Fig. 5). The schematic of the MFC is shown in Fig. S4. The nonwoven cloth was used as the separator of the cathodic and anodic chambers in the MFC. To prevent leakage, the nonwoven cloth was pretreated by tetrafluoroethylene as described previously1819, and was supported with a polyvinyl chloride tube. The total empty volume of the anodic chamber was 636 mL. Granular graphite with a diameter of 3–5 mm (Sanye Carbon Co., China) was used as the electrode material in the anode compartment, reducing the compartment liquid volume to 145 mL. In addition, a graphite rod with 6 mm diameter (Sanye Carbon Co., China) was inserted into the anode compartment for connection. A Ag/AgCl reference electrode was inserted into the anode chamber for monitoring anode potential. A 0.6-cm thickness carbon-graphite felt with 380 cm2 of surface area (Sanye Carbon Co., China) was used as the cathode material without any pretreatment. The graphite rod and carbon felt were connected by titanium wires across an external resistance (100 Ω). The 50-mL inoculated sludge of the MFC was the concentrated anaerobic sludge with an SS concentration of 10 g/L from an upflow anaerobic blanket reactor at our laboratory.


An MFC-based online monitoring and alert system for activated sludge process.

Xu GH, Wang YK, Sheng GP, Mu Y, Yu HQ - Sci Rep (2014)

Schematic of the MFC-based online monitoring and alert system.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4209466&req=5

f5: Schematic of the MFC-based online monitoring and alert system.
Mentions: The established online monitoring and alert system included three parts: a single-chamber MFC, a signal acquisition subsystem and an alert subsystem with self-diagnosis function (Fig. 5). The schematic of the MFC is shown in Fig. S4. The nonwoven cloth was used as the separator of the cathodic and anodic chambers in the MFC. To prevent leakage, the nonwoven cloth was pretreated by tetrafluoroethylene as described previously1819, and was supported with a polyvinyl chloride tube. The total empty volume of the anodic chamber was 636 mL. Granular graphite with a diameter of 3–5 mm (Sanye Carbon Co., China) was used as the electrode material in the anode compartment, reducing the compartment liquid volume to 145 mL. In addition, a graphite rod with 6 mm diameter (Sanye Carbon Co., China) was inserted into the anode compartment for connection. A Ag/AgCl reference electrode was inserted into the anode chamber for monitoring anode potential. A 0.6-cm thickness carbon-graphite felt with 380 cm2 of surface area (Sanye Carbon Co., China) was used as the cathode material without any pretreatment. The graphite rod and carbon felt were connected by titanium wires across an external resistance (100 Ω). The 50-mL inoculated sludge of the MFC was the concentrated anaerobic sludge with an SS concentration of 10 g/L from an upflow anaerobic blanket reactor at our laboratory.

Bottom Line: Such a submersible MFC utilized organic substrates and oxygen in the AS reactor as the electron donor and acceptor respectively, and could provide an evaluation on the status of the AS reactor and thus give a reliable early warning of potential risks.The results indicate that this online monitoring and alert system was highly sensitive to the performance variations of the AS reactor.The stability, sensitivity and repeatability of this online system provide feasibility of being incorporated into current control systems of wastewater treatment plants to real-time monitor, diagnose, alert and control the AS process.

View Article: PubMed Central - PubMed

Affiliation: 1] CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China [2] Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China.

ABSTRACT
In this study, based on a simple, compact and submersible microbial fuel cell (MFC), a novel online monitoring and alert system with self-diagnosis function was established for the activated sludge (AS) process. Such a submersible MFC utilized organic substrates and oxygen in the AS reactor as the electron donor and acceptor respectively, and could provide an evaluation on the status of the AS reactor and thus give a reliable early warning of potential risks. In order to evaluate the reliability and sensitivity of this online monitoring and alert system, a series of tests were conducted to examine the response of this system to various shocks imposed on the AS reactor. The results indicate that this online monitoring and alert system was highly sensitive to the performance variations of the AS reactor. The stability, sensitivity and repeatability of this online system provide feasibility of being incorporated into current control systems of wastewater treatment plants to real-time monitor, diagnose, alert and control the AS process.

Show MeSH
Related in: MedlinePlus