Advanced fuzzy control in industrial wastewater treatment (pH and temperature control)

Wastewater reuse is being increasingly promoted as a strategy for conservation of limited resources of freshwater and as a mean of safeguarding the aquatic environment from contaminants present in wastewater. Waste water disposed of in the ground reduces the quality of ground water and surface waters. Untreated waste-water generally contains high levels of organic material, numerous pathogenic microorganisms which entails environmental and health hazards. In this project, a design of an automated control for industrial waste water treatment using fuzzy logic control is presented. Fuzzy control concepts have been adopted and control algorithms based on pH and temperature variations provided accurate and reliable treatment of waste water. Two inputs, pH and temperature, and four outputs, hot and cold water valve and acid and base valve were given to the system. The behavior of the system was observed whenever an input came in. the pH was to be kept at a neutral status of between 6.5 and 7.5 and the temperature had to be kept within a range of between 25°C and 35°C. The fuzzy rules managed to keep the system stable as was seen from the graphs.