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.
Control of coagulation process by dual wavelength article analyzer
Norihito Tambo, Yoshihiko Matsui, Ken-ichi Kurotani, Masakazu Kubota, Hirohide Akiyama, Tokio Ohto, Yasushi Zaitsu, Haruo Itoh; Control of coagulation process by dual wavelength article analyzer. Water Sci Technol 1 August 1997; 36 (4): 135–142. doi: https://doi.org/10.2166/wst.1997.0104
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