A coagulation process for water purification plants mainly uses feedforward control based on raw water quality and empirical data and requires operator's help. We developed a new floc sensor for measuring floc size in a flush mixer to be used for floc control. A control system using model predictive control was developed on the floc size data. A series of experiments was performed to confirm controllability of settled water quality by controlling flush mixer floc size. An automatic control with feedback from the coagulation process was evaluated as practical and reliable. Finally this new control method was applied for actual plant and evaluated as practical.

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Hwcontrol theory was applied to motor speed control system to get controller which acts effectively with control object including uncertainties. A mixed sensitivity Hw control problem was composed and solved. After that, numerical simulation were executed to confirm ability of the controller.Here. the part Khich consists of T L . BL and Tc in Fig. 1

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