Abstract
The physico-chemical treatment of sewage requires the addition of costly reagents. The quantities added are generally proportional to the flowrate treated. Recent progress in pollution detectors now makes it possible to measure sewage concentration continuously. This makes it possible to match the quantity of reagent added to the treated-water quality objective set. COD-SM-Turbidity relations have been determined at various sites. An assessment of the performance of a servocontrol device during the summer of 1983 is presented.
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