PH CONTROL USING A SIMPLE SET-POINT CHANGE

The control of the pH process plays an important role in wastewater tr eatment or cell growth rate in biological systems. However, pH control has been a difficult problem due to its nonlinearities and time-varyi ng properties. Many authors proposed nonlinear pH control strategies t o overcome these drawbacks. However, their methods' complicated contro l structures make practical implementation difficult. Therefore, in th is study, we propose a new control strategy using a simple set point c hange. The proposed method has short identification time and reduces t he effects of noise by considering many data points.