The concept of a technological system for the treatment and using rainwater in swimming pool installations

This study introduces and validates the “SwimmInRain” system, a technological solution for rainwater treatment in public swimming pool installations. Laboratory experiments and analytical evaluations focused on optimizing process components, with special attention to UV-based advanced oxidation. Raw rainwater often exhibited turbidity (1.67 ± 0.1 NTU) and pH (6.04 ± 0.1) values outside acceptable ranges, prompting the development of a multistage treatment system. The complete technology includes filtration, separation of petroleum substances, coagulation, mechanical filtration, UV disinfection, chlorination, and pH correction. Medium-pressure UV lamps, particularly the TQ-Z3 model, showed superior effectiveness in degrading organic micropollutants. Removal efficiency was influenced by UV dose and exposure time. Post-treatment water quality improved significantly, with total organic carbon reduced by up to 35.7 %. Combined chlorine concentrations were also minimized, indicating fewer disinfection by-products. The “SwimmInRain” system offers an environmentally sound method for reusing rainwater in swimming pools, aligning with sustainability goals and ensuring safe, cost-effective water management. • SwimmInRain enables safe and sustainable rainwater reuse in public swimming pool installations. • The system reduces operating costs, improving access to public pools and lowering maintenance needs. • Medium-pressure UV lamps showed high efficiency in degrading organic micropollutants. • Lab results confirm the system’s effectiveness in supporting sustainable urban water strategies.