Preliminary Investigation into Using Oxidation-Reduction Potential (ORP) for Real-Time Control of Aerobic-Anoxic Sludge Digesters

by D. G. Wareham, Univ of B.C, Vancouver, Canada,
K. J. Hall, Univ of B.C, Vancouver, Canada,
D. S. Mavinic, Univ of B.C, Vancouver, Canada,

Abstract: This research explores the use of Oxidation-Reduction Potential (ORP) to control an Aerobic-Anoxic Sludge Digestion Process. It compares a Fixed-Time Control reactor (3 hours of air on/3 hours of air off) with a Real-Time Control Reactor (3 hours of air on/a variable length of time for the air off). The Real-Time Control Reactor relies upon the detection of a 'nitrate breakpoint' by the computer in the ORP-time curve. Comparisons between the two reactors showed that for the conditions studied the Real-Time Control reactor outperformed the Fixed-Time Control Reactor.

Subject Headings: Sludge | Oxidation | Waste treatment | Control systems | Aerobic processes | Nitrates | Computing in civil engineering | Curvature

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