RESTRUCTURING PLANT SIMULATOR AND DESIGN CONTROL SYSTEM OF PH NEUTRALIZATION PROCESS FOR TEXTILE INDUSTRY WASTEWATER TREATMENT

• Main Author: YULIA - NIM: 23816009 , ELFI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/26900
• Institution: Institut Teknologi Bandung

<p align="justify">The textile industry sector is an important sector to increase the Indonesia’s income in exports reaching US $ 7.12 billion. It also absorbing labor up to 2.73 million in 2017. Increased textile production is accompanied by an increase in the amount of textile waste but wastewater treatment has not been up to standard and causing environmental pollution such as in Citarum watershed. The textile waste output is at pH of 8-10 while pH allowed is in the range pH of 6-9. To support efforts to decrease the pH of waste, this research is focused on the pH neutralization process of The Textil Industrial Wastewater Treatment Plant (IPLIT). IPLIT in laboratory scale is restructured with the aim to improve system performance during the design of controlling the pH neutralization process. IPLIT integrates 5 main processes, there are equalization, neutralization, electrocoagulation, transition and filtration. The IPLIT panel is also designed to integrate sensors and actuators with the aim of facilitating monitoring and controlling the system. The advantages of IPLIT are more effective and efficient, easy to move, requires a small area, easy to connect sensors and actuators and easy to use for further research. <br /> <br /> <br /> The pH neutralization process in IPLIT is a chemical reaction process to decrease the pH of waste containing a strong base of NaoH and weak acid neutralizing CH3COOH. Modelling and control simulation of pH neutralization process using parameters obtained from system dnamic model based on IPLIT identification result. The parameters used are the disturbance input parameters by waste inlet flow rate 0.8 L / m and 1 L / m, the manipulated input is the acid neutralizing inlet flow rate between 0.6L / m-1.0L / m. The concentration of waste is pH of 9-10 and the neutralizing concentration is pH of 45.The identification of the pH neutralization process in the simulation shows the characteristics of pH is close to linear in the range of pH 9.2 to 9.8. So, the control parameters can be obtained by PI Ziegler Nichols Tuning Method. The result of closed loop response indicates an oscillatory response and a negative flow rate. To solve this problem is by combining PI Ziegler Nichols Tuning Method and Dynamic Operability Framework (DOF) optimization with constrain system using input manipulated and disturbance inputs to obtain a feasible controller configuration . This design produces a feasible controller configuration when the waste pH of 9.5 to achieve steady-state pH of 8.5 with the control parameters Kp = -0.07 and Ti = 30.54 and has robust system to the disturbance. Implementation of control parameters on IPLIT resulted in a good response with system response always approaching steady state and in 1400 secon obtained 5 times the waste treatment cycle and robust to disturbance from waste inlet flow rate 0.8 L/m. <p align="justify">