Degradation Characteristics of Phenolic Compounds Using Micro-Bubbles of Ozonated Oxygen

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We performed experiments on the risk-free degradation of p-chlorophenol dissolved in water, by using micro-bubbles or milli-bubbles of ozonated oxygen in a 1 L bubble column reactor. The micro bubble dispersion showed superior phenolic degradation performances as compared to the millibubble dispersion system. When using ozonated-oxygen microbubbles, the ozone absorption efficiency was found to be very high when the volumetric flow rates of supplied ozonated oxygen were low. Owing to their high specific surface area and self-compression effects, the microbubble dispersion could achieve very high ozone absorption performances. Even though the microbubble methodology leads to low volumetric flow rate of ozonated oxygen, the degradation rate of phenolic compounds was maintained high during the course of the experiments, and the produced organic acid components were further decomposed quickly to maintain their concentrations at low levels. The apparent first-order-reaction rate constant for the ozone-degradation of p-chlorophenol correlated well with a linear function of the liquid-phase ozone concentration attained, regardless of the bubble flow mode utilized. With the aim to enhance the ozone degradation of the phenolic compound in the microbubble dispersion, we further investigated the effects of addition of NaOH.