ENGINEERED CONTROLLER MODELLING APPROACH FOR TEMPERATURE CONTROL OF HEAT EXCHANGER IN WASTEWATER TREATMENT

Performance of pilot humidification and dehumidification plant for treatment of textile industry wastewater is analyzed. To keep balance between the industrial growth, water scarcity and industrial effluents, proper treatment technologies for industrial effluents is needed. Drawbacks of the prevailing water treatment technologies are size of the components, land area and source for treatment. The experimentation is carried out in the Kariapudur common effluent treatment plant, Tirupur. Fuzzy Logic Controller (FLC) and Proportion,Integral and Derivative (PID) controller were used for predicting the accuracy of the process. Condensate flow (m3 /hr), feed inlet temperature (°C) and steam flow (kg/cm) for textile effluents were used to predict the output condensate temperature (°C). The accuracy of the developed model was validated using Integral of the Absolute value of the Error (IAE), Integral of the Square Error (ISE), and Integral of the Time weighted Absolute Error (ITAE). Comparison of the models indicated the advantage of FLC model over PID model. The values of PID reported 686,1064 and 2078 of the IAE, ISE and ITAE. Similarly, the FLC reported 443,758 and 1075 of the IAE, ISE and ITAE respectively. Based on simulated results obtained from heat exchanger using Fuzzy model, the solar evacuated tube compact desalination system is developed. The compact desalination system is designed with different size of the tube heat exchanger interlinked together acting as filter, evaporator, and condenser. The solar tube collector is employed as a heat source. FLC model was found to be more effective in predicting the condensate temperature, the results were in line with the experimental data. Maximum of ten liters per day(10L/day) of fresh water is produced from the compact desalination system at the area of 0.4 m2 . The developed hardware set up is tested with same effluent collected from textile industry and it showed 440,762 and 1065 of the IAE, ISE and ITAE respectively. The comparison between the temperature from the experiment and those measured from the simulations shows that the proposed pilot plant is in line with the industry output data. Finally, the economic analysis is also conducted to identify the payback period and is found as 1 year. The treated water could be recycled using this process. Optimization of the process parameters helps in minimizing water consumption and offers economic benefits for wastewater treatment