H2O2强化光催化处理苯胺化工废水的应用试验

研究者在苯胺模拟废水高级氧化处理方面开展了很多研究，但针对炼化企业苯胺装置废水含盐高、色度高、COD降解难等问题尚未开展工程应用。为解决苯胺生产废水的实际问题，本研究开展了TiO₂/UV-H₂O₂氧化降解苯胺废水（1~2m³/h）的现场试验研究。考察了苯胺废水在单独TiO₂/UV、单独H₂O₂氧化及TiO₂/UV-H₂O₂协同作用下的处理效果，提出了苯胺废水的最佳处理工艺方案，并进行了成本核算。结果表明，单独TiO₂/UV和单独H₂O₂氧化对苯胺废水的脱色率和COD去除率偏低，而TiO₂/UV-H₂O₂协同作用时苯胺废水脱色率和COD去除率可达95%以上。协同氧化体系中，H₂O₂的氧化降解作用显著，H₂O₂投加量1%~2%；酸性条件利于苯胺废水的降解，特别是pH=3.8~4.2时；TiO₂/UV和H₂O₂协同作用一段时间后，停止UV而凭借残余H₂O₂可以将体系中的中间产物继续降解直至矿化成CO₂。TiO₂/UV- H₂O₂协同处理炼化企业苯胺生产废水，出水COD≤60mg/L，色度≤20倍，单位能耗约18.44kW·h/m³，明显低于文献报道值，具有显著的技术性与经济性。

In situ test of aniline wastewater degradation by photocatalytic treatment combined with H2O2

Advanced oxidation processes on aniline simulated wastewater treatment have received considerable studies to eliminate organic pollutants, but such techniques have rarely been employed to solve the problem of high salinity, high chromaticity and refractory COD of aniline wastewater in petrochemical enterprises. In this study, in situ degradation experiments (1—2m³/h) on aniline wastewater by TiO₂/UV-H₂O₂ were carried out. The degradation effects of aniline wastewater were examined in TiO₂/UV system, H₂O₂ oxidation system, and a combination system of TiO₂/UV and H₂O₂. An optimal treatment process for aniline wastewater was proposed and its operational costs were also evaluated. It was observed that the application of TiO₂/UV and H₂O₂ alone had relatively low decolorization rate and COD removal rate for aniline wastewater, whereas the decolorization rate and COD removal rate can reach over 95% by TiO₂/UV-H₂O₂ synergistic oxidation. H₂O₂ contributes to a predominant oxidative degradation in the synergistic oxidation system with a common total dosage of 1%~2%. Acidic conditions favored the degradation of aniline-containing wastewater, especially pH=3.8~4.2. After a period of synergistic oxidation by TiO₂/UV-H₂O₂, the UV light was turned off and the intermediate compounds in the system could be further mineralized to CO₂ by residual H₂O₂. COD and chromaticity in the effluent were below 60mg/L and 20 times, respectively, and the operational cost was 18.44 kW·h/m³, much lower than the reported value. So, TiO₂/UV-H₂O₂ seems to be significantly feasible and economical for the mineralization of aniline wastewater.