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This study evaluated ozonation in combination with biological fluidized‐bed treatment (FBT) for control of trihalomethane (THM) precursors in drinking water. THM precursors were represented by several surrogate parameters, including total organic carbon, ultraviolet absorbance measured at 254 nm, humic substances, and THM formation potential. The study was conducted using a continuously operated ozonation–FBT system. No pretreatment was provided. In addition, biofiltration and bench‐scale ozonation systems were used to compare the biodegradation efficiency of FBT with that of biofiltration and to investigate the effect of ozonation on biodegradation efficiency. The study showed that the combined ozonation–FBT process was effective in removing THM precursors and reducing turbidity in drinking water. Preliminary cost estimates indicate that the ozonation–FBT process may be a viable alternative to conventional coagulation processes that require additional steps, such as ozonation and biological activated carbon filtration for the control of disinfection by‐products in drinking water.

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