Application of an Optical Monitor in Automatic Control of Coagulation Dosing in Water Treatment Operations

by Chihpin Huang,
Chi-Bing Liu,

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water


The feasibility of applying an optical monitor in the automatic control of coagulation was assessed in this study. Prior to simulation testing, a series of batch tests was performed to determine the optimum state of dosing corresponding to the monitor's output. The results indicate that floc density decreased as floe size increased under the same coagulant dosage. Moreover, ratio output of the monitor could provide an index for evaluating the change trend of floc size in flocculation and for predicting the potential of floe settling. An automatic control system on the basis of the progressive dosing by the optical monitor was designed and connected to a laboratory-scale water treatment process. Simulation tests demonstrated that this optical monitor could be successfully applied in the on-line control of coagulation dosing. The recommended control parameters for the control system were also identified.

Subject Headings: Water treatment | Control systems | Automation | Coagulation | Feasibility studies | Density (material) | Professional societies | Flocculation

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