电-多相臭氧催化工艺深度处理焦化废水

Study on electrochemical heterogeneous catalytic ozonation process for treatment of coking wastewater

本文采用新型电-多相臭氧催化(E-catazone)工艺深度处理焦化废水生化二级出水,开展工艺可行性研究.通过与O3/TiO2纳米花(TiO2-NF)与O3/TiO2-NF/H2O2及单独电化学氧化工艺相比较,对E-catazone工艺技术优势及氧化机理进行探究.结果表明:在相同条件下(O3浓度84mg/L),电-多相臭氧催化获得的COD和TOC的去除率(分别为67.9%,50.0%)显著优于O3/TiO2-NF获得的去除率(25.8%,20.9%),即便在O3/TiO2-NF体系中投加5g/L的H2O2以促进臭氧均相催化效果,但COD和TOC去除率也仅分别提高到63.6%,43.6%.

In this paper,a new electric-heterogeneous ozone-catalyzed(E-catazone)process was used in advanced treatment of the secondary biochemical effluent from coking wastewater,and the process’s feasibility was also studied.By comparing the E-catazone process with three other processes:the O3/TiO2 nanoflowers(TiO2-NF)process,the O3/TiO2-NF/H2O2 process,and the electrochemical oxidation process(EO),the technological advantages and oxidation mechanism of E-catazone were investigated.Under the same conditions(O3 concentration of 84mg/L),the removal rates of COD and TOC(67.9%,50.0%)in E-catazone process were significantly superior to the performance(25.8%,20.9%)in O3/TiO2-NF process.Even with 5g/L of H2O2 added in the above O3/TiO2-NF system to promote homogeneous ozone catalytic ability,the obtained removal rates of COD and TOC had only increased to 63.6%and 43.6%,respectively.The performance of O3/TiO2-NF/H2O2 system was still not as good as the E-catazone process.