Abstract
AbstractMagnesium hydroxide [Mg(OH)2] is a commonly used chemical for controlling corrosion and odor problems in sewers by reducing the transfer of hydrogen sulfide from the liquid to the gas phase through pH elevation. The effectiveness of many current dosing practices is unsatisfactory due to negligence of the dynamics of sewage flow and characteristics, and their effects on sewage pH. This paper reports the design and validation of the first online control algorithm for Mg(OH)2 dosing to sewers. The control algorithm consists of a combination of feedforward and feedback loops. A feedback controller is used to calculate the Mg(OH)2 dosing rate to raise the sewage pH at the pumping station to the set-point. A feedforward controller is then used to calculate the additional Mg(OH)2 dose based on the prediction of acid production in the downstream sewer pipe due to in-sewer processes. A further feedback controller is used to adjust the Mg(OH)2 dosing rate to correct the error between the sewage pH at the en...
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