Abstract
A fuzzy controller (FC) is designed to control wastewater treatment plants (WWTPs) and to monitor the effluent quality (EQ) and operational cost (OC). The effect of temperature (from 10°C to 35°C) on six kinetic parameters (growth and decay rates) by using the modified Arrhenius relation is studied in the presence of FC. A Benchmark Simulation Model (BSM1-) is used to design the FC, in order to check the plant performance and EQ that is affected by changing temperature. Two control loops dissolved oxygen and nitrate are controlled by manipulating oxygen mass transfer coefficient and internal recycling in seventh and fourth reactors. It is observed from the results that at 10°C and 35°C temperatures, the EQ is not good, the effluent has violations and crossed the acceptable limits. There is a trade-off between EQ and OC by varying temperatures. On comparing 15°C with other temperatures like 20°C, 23°C, 25°C, and 30°C, improved EQ is obtained with corresponding improvements as 16%, 58%, 68%, and 72% but with the corresponding increase in OC as 5.1%, 10.8%, 13.5%, and 16.8%. The pollutant concentrations of Total Phosphorous (TP) and Total Nitrogen (TN) are largely impacted by changing temperature. Hence, more efforts are required in order to operate WWTP at lower and higher temperatures.
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