非均相Fenton处理有机磷农药污染场地抽出地下水效能及影响因素

比较了不同非均相Fenton催化剂处理高浓度有机磷农药污染场地抽出地下水的COD、TP去除率以及污泥产率的差异,探究了H₂O₂投加量、非均相催化剂装填量、pH对反应效能的影响,并利用扫描电子显微镜(SEM),X射线能谱(EDS)等技术,分析了反应前后非均相催化剂表面结构特征与成分组成。结果表明:Fe₂O₃/Al₂O₃非均相催化剂具有较高的比表面积与负载Fe含量,反应后材料表面有Fe元素沉积。以Fe₂O₃/Al₂O₃、Al₂O₃、Fe₂O₃/SiO₂-Al₂O₃作为催化剂的非均相Fenton反应,其COD、TP去除率分别可达到84.72%、74.10%、75.98%与88.48%、82.80%、85.83%,均高于无固体催化剂的均相Fenton反应。ρ(H₂O₂)/ρ(COD)=0.5~2.0时,COD与TP去除率随H₂O₂投加量的增加而提升,并与非均相催化剂装填量呈正相关。同时,非均相催化剂的投加可显著降低污泥产率,扩大反应体系有效pH范围。

TREATMENT EFFICIENCY OF HETEROGENEOUS FENTON ON GROUNDWATER PUMPED FROM ORGANOPHOSPHORUS PESTICIDE CONTAMINATED SITES AND ITS INFLUENCE FACTORS

The differences in COD, TP removal rate and sludge yield in different heterogeneous Fenton catalysts for treating high concentration organophosphorus groundwater pumped from pesticide-contaminated sites were compared, and the influences of H₂O₂ dosage, heterogeneous catalyst loading and pH on the reaction efficiency were investigated. The surface structure and composition of heterogeneous catalysts before and after the reaction were analyzed using scanning electron microscope(SEM) and X-ray energy spectrum(EDS). The results indicated that Fe₂O₃/Al₂O₃ heterogeneous catalyst had a higher specific surface area and Fe content at load, and Fe was deposited on the surface of the material after the reaction. In heterogeneous Fenton reaction with Fe₂O₃/Al₂O₃, Al₂O₃ and Fe₂O₃/SiO₂-Al₂O₃ as catalysts, the removal rates of COD and TP can reach 84.72%, 74.10%, 75.98% and 88.48%, 82.80%, 85.83%, respectively. Higher than homogeneous Fenton reaction without solid catalyst. In the range of ρ(H₂O₂)/ρ(COD)=0.5~2.0, the removal rates of COD and TP significantly increased with the increase of H₂O₂ dosage, and the removal rates of COD and TP were in direct proportion to the loading amount of heterogeneous catalysts. At the same time, the addition of heterogeneous catalyst can significantly reduce the sludge yield and expand the effective pH range of the reaction system.