高级氧化集成技术深度处理造纸废水工艺研究

Advanced Oxidation Integrated Technology for Advanced Treatment of Papermaking Wastewater

关键词:  造纸废水  活性炭吸附  芬顿氧化  臭氧催化氧化

Key Words:papermaking wastewater, activated carbon adsorption  Fenton oxidation  ozone catalytic oxidation

摘要:本课题介绍一种活性炭吸附+芬顿氧化+臭氧催化氧化的高级氧化集成技术，并将其应用于造纸废水处理。结果表明，最佳处理条件为：活性炭添加量为0.5 g/L，吸附时间30 min，COD_Cr去除率达60%；芬顿氧化工艺处理活性炭吸附出水时，H₂O₂添加量为0.25 g/L，n(Fe²⁺):n(H₂O₂)=1:4、反应时间为1 h，COD_Cr去除率最高可达到32%；臭氧催化氧化处理芬顿氧化出水时，臭氧浓度为10%，H₂O₂加入量为0.1 g/L，气液比为2:1，反应时间为1.0 h，去除效果最佳。该高级氧化集成技术可将废水COD_Cr从180 mg/L降至25 mg/L，去除率为86.1%；达到地表水准Ⅳ类，综合运行成本为8.9元/t。

Abstract:In this study， an advanced oxidation integrated technology of activated carbon adsorption+Fenton oxidation+ozone catalytic oxidation， applied to the treatment of papermaking wastewater was introduced. The results showed that the optimal treatment conditions were as follows： when the amount of activated carbon was 0.5 g/L and the adsorption time was 30 min， the COD_Cr removal rate could reach 60%； when the effluent was treated by Fenton oxidation process with addition amount of H₂O₂ was 0.25 g/L， n（Fe²⁺）：n（H₂O₂）=1：4， and reaction time was 1.0 h， the COD_Cr removal rate could reach up to 32%； when the Fenton effluent was further treated by ozone catalytic oxidation， ozone concentration was 10%， H₂O₂ dosage was 0.1 g/L， gas-liquid ratio was 2：1， and reaction time was 1.0 h， the COD removal effect was the best. This advanced oxidation integrated technology could reduce the COD_Cr of wastewater from 180 mg/L to 25 mg/L with a removal rate of 86.1%， reaching the surface water level of Ⅳ class， and the integrated operation cost was ¥8.9/t.