The present study aims to characterize the change in the composition and structure of the bacterial and microzooplankton planktonic communities in relation to the phytoplankton community composition during a bloom. High‐throughput amplicon sequencing of regions of the 16S and 18S rRNA gene was undertaken on samples collected during a 20 day (d) mesocosm experiment incorporating two different nutrient addition treatments [Nitrate and Phosphate (NPc) and Nitrate, Phosphate and Silicate (NPSc)] as well as a control. This approach allowed us to discriminate the changes in species composition across a broad range of phylogenetic groups using a common taxonomic level. Diatoms dominated the bloom in the NPSc treatment while dinoflagellates were the dominant phytoplankton in the control and NPc treatment. Network correlations highlighted significant interactions between OTUs within each treatment including changes in the composition of Paraphysomonas OTUs when the dominant Chaetoceros OTU switched. The microzooplankton community composition responded to changes in the phytoplankton composition while the prokaryotic community responded more to changes in ammonia concentration.

Ozonation is a water treatment process for disinfection and/or micropollutant abatement. However, ozonation of bromide-containing water leads to bromate (BrO 3 −) formation, a potential human carcinogen. A solution for mitigating BrO 3 − formation during abatement of micropollutants is to minimize the ozone (O 3 ) concentration. This can be achieved by dosing ozone in numerous small portions throughout a reactor in the presence of H 2 O 2 . Under these conditions, O 3 is rapidly consumed to form hydroxyl radical ( • OH), which will oxidize micropollutants. To achieve this goal, a novel process ("MEMBRO 3 X") was developed in which ozone is transferred to the water through the pores of polytetrafluoroethylene (PTFE) hollow fiber membranes. When compared to the conventional peroxone process (O 3 /H 2 O 2 ), the MEMBRO 3 X process shows better performance in terms of micropollutant abatement and bromate minimization for groundwater and surface water treatment. For a groundwater containing 180 μg/L bromide, a 95% abatement of the ozone-resistant probe compound p-chlorobenzoic acid yielded <0.5 μg/L BrO 3 − , whereas in the conventional peroxone process, 8 μg/L BrO 3 − was formed. In addition, the efficacy of the MEMBRO 3 X process was demonstrated with river water and lake water.

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