• Journal of Korean Society of Environmental Engineers
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• v.28 no.4
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• pp.453-458
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• 2006

An electrochemical COD(Chemical Oxygen Demand) sensor using an electrode-surface finding unit has been constructed. The electrolyzing(oxidizing) action of copper on the organic species was used as the basis of the COD measuring sensor. Using a simple three electrode cell, organic species which has been activated by the catalytic action of copper is oxidized at a working electrode, poised at a positive potential. A novel modification of the above method allowed for extended use of the electrode, in which the action of the electrode is regenerated by an electrode-surface grinding unit. When samples obtained from a wastewater treatment factory were measured, a linear correlation($r^2=0.93$) between the measured value(EOD) and $COD_{Mn}$ of the samples was observed. Overall results indicated that the electrochemical sensor with grinding unit could be applied for continuous measurements of COD in practical fields.