超声/紫外强化Fenton法深度处理造纸废水研究

Ultrasonic/Ultraviolet Enhanced Fenton for Advanced Treatment of Papermaking Wastewater

本研究采用超声/紫外强化Fenton法深度处理造纸废水,以COD、BOD去除率为评价指标,研究反应时间、超声功率和频率、紫外强度、H_(2)O_(2)和FeSO_(4)·7H_(2)O投加量、pH值对处理效果的影响。结果表明,超声/紫外强化Fenton法深度处理造纸废水的最佳处理条件为:反应时间90min、超声功率160W,超声频率50kHz、紫外光强度12mW/cm^(2)、H_(2)O_(2)投加量12mL/L、FeSO_(4)·7H_(2)O投加量500mg/L、溶液pH值=5,最佳反应条件下造纸废水的COD_(Cr)和BOD_(5)去除率分别为74.8%和75.5%。超声/紫外强化Fenton法深度处理造纸废水具有协同效应,其处理效果优于超声+紫外+Fenton法。超声/紫外强化Fenton法深度处理后,造纸废水满足《城镇污水处理厂污染物排放标准》GB18918—2002一级A排放标准。

In this study,ultrasonic/ultraviolet enhanced Fenton method was used for advanced treatment of papermaking wastewater.With the COD and BOD removal rates as evaluation index,the effects of reaction time,ultrasonic power and frequency,ultraviolet intensity,dosage of H_(2)O_(2) and FeSO_(4)·7H_(2)O,and pH value on the treatment effect were studied.The result showed that the optimal treatment conditions of ultrasonic/ultraviolet enhanced Fenton method for advanced treatment of papermaking wastewater were as follows:reaction time 90 min,ultrasonic power 160 W,ultrasonic frequency 50 kHz,ultraviolet intensity 12 mW/cm^(2),dosage of H_(2)O_(2)12 mL/L,FeSO_(4)·7H_(2)O 500 mg/L,and pH value 5.Under the optimal treatment conditions,the COD_(Cr) and BOD_(5) removal rates of papermaking wastewater were 74.8%and 75.5%,respectively.The ultrasonic/ultraviolet enhanced Fenton method had a synergistic effect on the advanced treatment of papermaking wastewater and its treatment effect was better than that of the combination of ultrasonic+ultraviolet+Fenton method.After the advanced treatment by ultrasonic ultraviolet enhanced Fenton method,the papermaking wastewater meets the class A standard of GB18918—2002“Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant”.