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Galvanic Dissolved Oxygen Monitoring Still Has A Place In Wastewater
August 24, 2010
•Tutorial: Galvanic Dissolved Oxygen Monitoring Still Has A Place In Wastewater
By Jim Dartez
Once secondary treatment is used in the controlled process of wastewater treatment, the measurement of DO is important in two locations of the plant — in the bioreactor, or aeration basin, and the outfall if the water is going into natural waterways. The purpose of the former is to make certain that the biology in the aeration process has enough DO to remain alive, and the purpose of the latter is to make sure that the DO is high enough in the water leaving the plant to sustain life.
Initially, laboratory meters and wet tests were used in this measurement, and then, in the 1950s, somewhat reliable portable meters were used to monitor DO. Not long after that, continuous DO meters were put into use, not only to measure the DO continuously but often to control the aeration process in the bioreactor. Certainly, this continuous monitoring capability also gave plant management the ability to record DO measurements continuously.
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