Design of UV reactors for drinking water has been widely studied using computational fluid dynamics (CFD) modeling. When combined with collimated beam test (CBT), CFD becomes a powerful tool for verifying the performance of a UV reactor. However, the design of real scale UV reactor for ballast water treatment system (BWTS) has not been extensively studied due to their relatively short R&D history. For this reason, we have attempted to validate the UV reactor through the results of the biological efficacy (BE) test with Tetraselmis microorganism. Through BE tests, we found that 3-log <i>Tetraselmis</i> inactivation was satisfied when the reduction equivalent dose (RED) was higher than that of 1,500 J/m<sup>2</sup>.
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