A chemical credit framework to predict the removal performance of organic chemicals of concern from water through an ozonation process
A critical finding of the study was the importance of maintaining an O3/TOC ratio of greater than 0.404 to overcome the Instantaneous Ozone Demand (IOD), ensuring sufficient ozone is available to oxidize the CoC. For chemicals with a high reactivity towards ozone (KO3 > 10^5 M−1s−1) and hydroxyl radicals (K∙OH > 10^9 M−1s−1), such as those with aromatic structures, achieving an O3/TOC ratio of ≥0.461 or a measurable O3 CT of ≥0.063 mg min/L resulted in a log reduction value (LRV) of at least 1. Meanwhile, for CoC with lower reactivity, a combination of O3/TOC ratio, O3 CT values, and chemical structure classification is necessary for evaluating their removal efficiency.
In conclusion, this study demonstrates that effective ozonation in wastewater treatment relies heavily on understanding and managing key parameters such as the O3/TOC ratio and O3 CT values, alongside the chemical properties of the contaminants. This approach ensures the effective removal of organic chemicals, safeguarding water quality and public health.
