FUZZY LOGIC CONTROL OF A NONLINEAR PH-NEUTRALISATION IN WASTE WATER TREATMENT PLANT
Samsul Bahari Mohd Noor, Way Cern Khor, Mohammad Effendy Ya’acob · 2004
Industrial processes produce a variety of waste water pollutants, some are difficult and/or costly to treat. Waste water characteristics and level of pollutants vary significantly by industry. The task of various pH control system is to adjust the pH of the process stream into the defined acceptable discharge range. This study focuses on the control of highly nonlinear pH level of the waste water i.e. to obtain a natural solution (pH of 7). The pH level and the flow rate are taken as inputs and the acid and base flow rate as the outputs. Fuzzy control system has been implemented based on system model. A very fast response and stable operation have been observed for transient response. Fuzzy logic controller with 21 rules which shows the most remarkable result of maintaining the output pH to 7±1 which is the acceptable pH level for waste water.