Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing, 100029, China.
College of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, 050018, China; School of Chemical Engineering, University of New South Wales, Sydney, NSW, 2052, Australia.
Chemosphere. 2021 Jul;274:129769. doi: 10.1016/j.chemosphere.2021.129769. Epub 2021 Jan 26.
Bisphenol A (BPA), a typical endocrine disrupting chemical, widely exists in water and threatens human health. The degradation of BPA by ozone in water is limited by the gas-mass transfer due to the low solubility of ozone. In this study, a rotating packed bed (RPB) was employed to create a high gravity environment to intensify the ozone mass transfer and BPA degradation. The effects of operational parameters (rotation speed of RPB, pH of the solution, ozone concentration, BPA concentration, gas volumetric flow rate and liquid volumetric flow rate) on BPA degradation efficiency and overall volumetric mass transfer coefficient of ozone were investigated. The results show that RPB effectively promoted the ozone mass transfer and BPA degradation and can be used for the ozonation of micropollutants that have fast reaction rates with ozone. Quenching experiments suggest that both ozone and HO∙ participated in BPA degradation from acidic to alkaline environments. In addition, the effects of co-existing chemicals on BPA degradation efficiency were studied. The addition of HO or Cl had no obvious impact on BPA degradation; the addition of HCO is beneficial for BPA degradation while the addition of fulvic acid suppressed the degradation. These results indicate that the pH value, which affects the reaction rate between ozone and BPA, is a major factor to be considered during the ozonation of BPA in RPB.
双酚 A（BPA）是一种典型的内分泌干扰化学物质，广泛存在于水中，对人类健康构成威胁。由于臭氧在水中的低溶解度，臭氧在水中对 BPA 的降解受到气-液传质的限制。在这项研究中，旋转填充床（RPB）用于创造高重力环境，以强化臭氧传质和 BPA 降解。考察了操作参数（RPB 的转速、溶液的 pH 值、臭氧浓度、BPA 浓度、气体体积流量和液体体积流量）对 BPA 降解效率和臭氧总体积传质系数的影响。结果表明，RPB 有效地促进了臭氧传质和 BPA 降解，可用于快速与臭氧反应的微污染物的臭氧化。猝灭实验表明，在从酸性到碱性的环境中，臭氧和 HO∙都参与了 BPA 的降解。此外，还研究了共存化学物质对 BPA 降解效率的影响。HO 或 Cl 的添加对 BPA 降解没有明显影响；HCO 的添加有利于 BPA 的降解，而腐殖酸的添加则抑制了降解。这些结果表明，在 RPB 中臭氧化 BPA 时，影响臭氧与 BPA 之间反应速率的 pH 值是一个需要考虑的主要因素。
