Continuous on-line monitoring of dissolved oxygen in the activated sludge of a sewage treatment plant

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Dissolved oxygen is traditionally measured using a Clark cell, which relies upon a gas-permeable membrane for its opera-tion. Such sensors are subject to fouling with subsequent loss of accuracy, making frequent maintenance and calibration necessary.

The objective of this development was to take advantage of specific properties of microelectrode arrays, such as low flow-dependence, insensitivity to media conductivity and fast re-sponse time [1] [2] to realize the direct, i.e. membrane-free, electrochemical measurement of dissolved oxygen (DO) in wastewater. The necessity of frequent calibration/cleaning was avoided by the use of a simple disposable membrane-less sensor.

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