Abstract
The removal of biodegradable ozone by‐products was evaluated at pilot scale using a fixed‐bed biofilm reactor (FBBR) containing spherical plastic support media. Six FBBRs were operated in parallel with different media sizes (1‐, 1.25‐, or 2‐in. diameter) and empty bed contact times (6 or 12 min). Influent water was provided from a full‐scale water treatment plant after ozonation, coagulation, and flocculation processes. After seven months of operation, pseudosteady‐state conditions were achieved with up to 50% removal of assimilable organic carbon and up to 40% reduction in ultraviolet absorbance at 254 nm. Increases in FBBR effluent turbidity and head loss were also indicative of biomass development and sloughing. Process efficiency deteriorated because of the consumption of the biomass by snails and other invertebrates.
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