臭氧-超声联用处理聚乙烯醇废水

本研究采用臭氧-超声（O₃/US）联用技术处理聚乙烯醇（PVA）废水，分别考察了PVA初始质量浓度、初始pH、臭氧通入速率、超声功率、超声频率及反应时间对PVA和COD去除效率的影响，并在此基础上通过正交实验确定了降解PVA和COD的最佳实验条件。研究结果表明，超声频率对去除率有显著影响，PVA初始质量浓度对去除效率的影响较大，反应时间、超声功率、臭氧通入速率和初始pH的影响相对较小。通过影响实验和正交实验确定的最佳降解条件为:PVA初始质量浓度100 mg/L、初始pH=9、臭氧通入速率4 g/h、超声功率320 W、超声频率40 kHz、反应时间20 min，此时COD和PVA的去除效率分别为86.4%和99.3%。超声对臭氧降解聚乙烯醇废水具有明显的协同作用，在最佳条件下，臭氧-超声联用技术比单独臭氧技术对PVA的去除率增加了5.1%，对COD去除率增加了19.4%。

Treatment Research of Polyvinyl Alcohol Wastewater by Ozone/Ultrasound Oxidation Process

The present work investigates the treatment of polyvinyl alcohol (PVA) wastewater by using ozone/ultrasound(US) oxidation process. The effects of initial PVA mass concentration, the flow rate of ozone, initial pH, ultrasonic power, ultrasonic frequency, and raction time have been studied. The optimal treatment conditions for PVA and COD removal were obtained using orthogonal experiments. The results showed that ultrasonic frequency has a remarkable influence on the removal efficiency,the initial PVA mass concentration plays an important role, while reaction time, ultrasonic power, the flow rate of ozone and initial pH have minor effects in order. The maximum removal of COD and PVA could be reached under the following conditions: initial PVA mass concentration was 100 mg/L, initial pH was 9, ozone dosage was 4 g/h, ultrasonic power was 320 W, ultrasonic frequency was 40 kHz, and the reaction time was 20 minutes. Under these conditions,the removal efficiency of COD and PVA was 86.4% and 99.3%,respectively. Compared O₃ with O₃/US, different types of technology were operated at the same final condition to show the difference between them, the PVA removal efficiency of O₃/US was 5.1% higher than O₃, the COD removal efficiency of O₃/US was 19.4% higher than that with the treatment of only O₃ under the same optimal conditions.