CONTROL OF COAGULATION PROCESS BY DUAL-WAVELENGTH ARTICLE ANALYZER

A coagulation process for water purification plants mainly uses feedfo rward control based on raw water quality and empirical data and requir es operator's help. We developed a new flee sensor for measuring flee size in a flush mixer to be used for flee control. A control system us ing model predictive control was developed on the floc size data. A se ries of experiments was performed to confirm controllability of settle d water quality by controlling flush mixer floc size. An automatic con trol with feedback from the coagulation process was evaluated as pract ical and reliable. Finally this new control method was applied for act ual plant and evaluated as practical. (C) 1997 IAWQ. Published by Else vier Science Ltd.