Membrane and Water Treatment

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Pre-ozonation for removal of algal organic matters (AOMs) and their disinfection by-products (DBPs) formation potential

  • Jing Wang (Research and Development Department, CanFit Resource Technologies Inc.) ;
  • Se-Hyun Oh (Department of Civil and Environmental Engineering, Daejeon University) ;
  • Yunchul Cho (Department of Civil and Environmental Engineering, Daejeon University)
  • Received : 2022.11.29
  • Accepted : 2023.04.04
  • Published : 2023.03.25
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Abstract

As a result of algal bloom, algal organic matters (AOMs) are rapidly increased in surface water. AOMs can act as precursors for the formation of harmful disinfection by-products (DBPs), which are serious problems in water treatment and human health. The main aim of this study is to characterize the formation of DBPs from AOMs produced by three different algae such as Oscillatoria sp., Anabaena sp., and Microcystis aeruginosa under different algal growth phases. In an effort to examine formation of DBPs during chlorination, chloroform (TCM), dichloroacetic acid (DCAA) and trichloroacetic acid (TCAA) were determined under various CT (product of disinfectant concentration and contact time, mg·min/L) values. Generally, the amounts of DBPs tended to increase with increasing CT values at the most growth phases. However, there was a significant difference between the amounts of DBPs produced by the three algal species at different growth phases. This result is likely due to the chemical composition variability of AOM from different algae at different growth phases. In addition, the effect of pre-ozonation on coagulation for the removal of AOMs from three algal species was investigated. The pre-ozonation had a positive effect on the coagulation/flocculation of AOMs.

Keywords

Acknowledgement

This research was supported by the Daejeon University Research Grants (2018).

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