Purified water is essential for numerous processes in the pharmaceutical industry, where its quality must be reliable. Achieving this requires careful design of the purified water preparation system. Seven simulations of different RO configurations were performed, based on which the optimal solution was selected. The parallel configuration of two RO modules proved to be the optimal solution, ensuring high performance with an efficiency of 75.7 %, the required purified water quality with a conductivity of 18 μS/cm, and moderate operating costs, while also providing redundancy and extending membrane life. The CCRO system also achieved very good results, delivering 80 % efficiency and a conductivity of 9 μS/cm, but it requires significantly higher investment costs. For the selected system, a process flow diagram was created and key components were sized to ensure reliable operation. To further improve system efficiency and sustainability, future research should explore the use of advanced technologies such as innovative membrane solutions and intelligent control systems.
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