旋转填充床中臭氧高级氧化法处理PVA废水

在旋转填充床（RPB）中进行了O₃/FeSO₄·7H₂O（用Fe（Ⅱ）表示）和O₃/Fenton两种高级氧化工艺处理模拟聚乙烯醇（PVA）废水的研究，考察了Fe²⁺浓度、初始pH、RPB转速、反应温度以及气相O₃浓度对PVA降解率的影响，结果表明O₃/Fenton工艺比O₃/Fe（Ⅱ）工艺表现出更好的PVA降解性能。在O₃/Fenton工艺中，在初始PVA浓度200 mg/L、pH=2、反应温度25 ℃、RPB转速1 000 r/min、O₃浓度30 mg/L、气体流量90 L/h、液体流量30 L/h、Fe²⁺浓度0.8 mmol/L、H₂O₂浓度35 mg/L的条件下，PVA的降解率可以达到99.4%。此外，还对O₃/Fe（Ⅱ）和O₃/Fenton工艺降解PVA的反应动力学进行了研究，发现这两种工艺中PVA降解反应均为一级反应。

Treatment of PVA wastewater by ozone-based advanced oxidation in a rotating packed bed

The O₃/FeSO₄·7H₂O (for the sake of simplicity, FeSO₄·7H₂O is represented below by Fe(Ⅱ)) and O₃/Fenton advanced oxidation processes were used to treat simulated polyvinyl alcohol(PVA) wastewater in a rotating packed bed (RPB). The effects of varying the Fe²⁺ concentration, initial pH value, RPB rotation speed, reaction temperature and ozone concentration on the degradation of PVA were investigated. The results showed that the O₃/Fenton process exhibited better PVA degradation performance than the O₃/Fe(Ⅱ) process. The extent of PVA degradation reached 99.4% in the O₃/Fenton process with an initial PVA concentration of 200 mg/L, pH of 2, reaction temperature of 25 ℃, RPB rotation speed of 1 000 r/min, O₃ concentration of 30 mg/L, gas flow rate of 90 L/h, liquid flow rate of 30 L/h, Fe²⁺ concentration of 0.8 mmol/L and H₂O₂ concentration of 35 mg/L. The reaction kinetics of PVA degradation by O₃/Fe(Ⅱ) and O₃/Fenton processes were also studied. It was found that the PVA degradation in both cases involved first-order reactions.