臭氧
传质
蒸馏水
化学
体积流量
传质系数
废水
水处理
流量(数学)
分析化学(期刊)
鼓泡塔反应器
振荡(细胞信号)
水流
连续反应器
气泡
色谱法
环境工程
机械
环境科学
催化作用
有机化学
物理
生物化学
气泡
作者
Cátia A. L. Graça,Rita Bravo Lima,M.F.R. Pereira,Adrián M.T. Silva,António Ferreira
标识
DOI:10.1016/j.cej.2020.124412
摘要
Ozone-water mass transfer was investigated in continuous mode using a macroscale oscillatory flow reactor provided with smooth periodic constrictions (OFR-SPC). The effects of oscillation amplitude (x0) and frequency (f) on the mass transfer coefficient (kLa) were assessed through a Doehlert experimental design. Different gas and liquid flow rates were also studied. The results show that kLa increases with f (up to 4 Hz), x0 (up to 15 mm), and the gas flow rate (up to 150 Ncm3 min−1). No significant changes in kLa were observed over a wide range of liquid flow rates (up to 180 mL min−1) and for Re0 < 1000. In all conditions studied, and among different reactor configurations tested, the higher kLa values were observed with the OFR-SPC, achieving kLa values up to 35 times higher than those obtained in a conventional bubble column. Moreover, the enhancement on the mass transfer efficiency (MTE) promoted by the oscillatory movement was more pronounced as the gas (ozone) flow rate decreases and liquid (water) flow rate increases, which is another advantage of this system when looking for large-scale implementation of the ozonation process in water treatment. Ozonation experiments using a mixture of fluoroquinolones in different matrices (distilled water, surface water and urban wastewater) were also performed, the results demonstrating that OFR-SPC is an interesting reactor alternative for ozone-driven water treatment.
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