电催化臭氧氧化技术深度净化纳滤膜浓水

Advanced purification of nanofiltration membrane concentrated water by electrocatalytic ozonation technology

纳滤膜浓水高效无害化处置是膜法污水深度处理值得关注的问题,传统臭氧氧化技术对膜浓水处置存在处理效率较低、氧化能力有限等问题。针对实际再生水深度净化工艺,构建并评估了电催化臭氧氧化技术对纳滤膜浓水净化效果。电催化臭氧氧化处理180 min可以去除膜浓水中72%的COD和71%的TOC,其一级反应速率常数是单独电催化氧化的14倍、单独臭氧氧化的1.5倍。进一步利用斜生栅藻生长抑制率指标评价了3种氧化过程对膜浓水处理时的毒性削减效果,单独臭氧氧化对膜浓水处理后的斜生栅藻生长抑制率达24.6%,而电催化臭氧氧化深度处理后斜生栅藻生长抑制率仅16.0%,电催化臭氧氧化技术处理后膜浓水的残存生物毒性显著降低。

The efficient treatment of nanofiltration membrane concentrated water is a noteworthy issue in the membrane-based wastewater treatment technologies.The traditional ozonation technology has the disadvantages such as low treatment efficiency and insufficient oxidation capacity for the treatment and disposal of membrane concentrated water.In this study,for the real process for advanced purification of the reclaimed water,the electrocatalytic ozonation technology was constructed to evaluate its performance on treating nanofiltration membrane concentrated water.Electrocatalytic ozonation could remove 72%of COD and 71%of TOC from membrane concentrated water after 180 min treatment.The first-order reaction rate constant was 14 times that of electrochemical oxidation alone and 1.5 times that of ozonation alone.Furthermore,the toxicity reduction performance of the three oxidation processes on membrane concentrated water treatment was evaluated by using the growth inhibition rate of Scenedesmus obliquus.The growth inhibition rate of Scenedesmus obliquus in membrane concentrated water treated by ozonation alone reached 24.6%,while the growth inhibition rate of Scenedesmus obliquus after electrocatalytic ozonation treatment was only 16.0%.The biological toxicity of membrane concentrated water treated by electrocatalytic ozonation system decreased significantly.