Abstract: Objective To analyze the effect of ultraviolet dechlorination device used in hemodialysis water treatment system. Methods  Twenty groups of ultraviolet dechlorination devices in our hospital were tested in the years of 2022 and 2023. When the ultraviolet dechlorination device was closed, total chlorine concentrations in water supply and after carbon cans were measured. When the ultraviolet dechlorination device was opened, total chlorine concentrations in water supply, after ultraviolet dechlorination device, and after carbon cans were measured. The results were compared and analysed. Results When the ultraviolet dechlorination device was opened, total chlorine in water supply decreased significantly with the average reduction rates of 75.0% and 62.5% in 2022 and 2023 respectively (t=40.825, P<0.001; t=46.483, P<0.001). When the device was opened in 2022 and 2023, total chlorine concentrations at the outlet of activated carbon tanks A1(t=-8.365,   P<0.001; t=-17.474, P<0.001), A2 (t=-6.718, P<0.001; t=-16.905, P<0.001), B1 (t=-8.014, P<0.001; t=-12.212, P<0.001) and B2 (t=-6.162, P<0.001; t=-13.789, P<0.001) decreased significantly, as compared with those when the ultraviolet dechlorination device was closed.  Conclusion  Ultraviolet dechlorination device is effective and can be used in hemodialysis water treatment system.

Key words: Ultraviolet dechlorination, Total chlorine, Hemodialysis water treatment