Semi-continuous measurement of oxygen demand in wastewater using biofilm-capacitance
2018
Sim, Junyoung | Reid, Robertson | Hussain, Abid | Lee, Hyung-Sool
Bio-capacitive coulombs were tested for determination of the 5-day biochemical oxygen demand (BOD₅) using a dual-chamber microbial electrochemical cell (MxC) operated at charging (open circuit) and discharging (close circuit) conditions. For acetate medium, the cumulative coulombs charged in a capacitive biofilm anode (open circuit) were well correlated with BOD concentrations (R² ~ 0.9). The maximum detectable BOD₅ concentration with the bio-capacitance MxC was close to 250 mg/L, and the cumulative coulombs were saturated for above the maximum BOD₅ concentration (Monod pattern). The bio-capacitance MxC sensor consistently showed high linearity between the cumulative coulombs and BOD₅ concentrations for domestic wastewater influent (R² = 0.93–0.99), despite of 1 min charging. High correlation between the coulombs and BOD₅ concentration was also obtained for wastewater effluent at 1 min charging, which indicates that the bio-capacitance MxC sensor can semi-continuously measure BOD₅ concentration in wastewater at every 2 min (1 min charging and 1 min discharging).
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