磁场/光催化强化人工湿地净化生活污水的试验研究

人工湿地已成为广泛运用的污水处理方式,但仍存在效率较低等缺陷,而以人工湿地耦合多种强化工艺已成为近年来的研究热点。分别构建了磁场强化和光催化强化的人工湿地,针对不同进水浓度和水力停留时间(hydraulic retention time,HRT)(24、48、72 h),探究在磁场和光催化强化作用下的人工湿地对污水中TP、PO₄^3--P、NH₄⁺-N和COD_Cr的去除效果。研究结果表明,施加磁场后可促进人工湿地系统对NH₄⁺-N和COD_Cr的去除,当HRT为24～72 h时,磁场强化的人工湿地对NH₄⁺-N和COD_Cr的去除率分别能达到58.77%～96.91%、41.16%～85.42%。光催化作用由于大量自由基的生成,对污水中部分污染物降解效果明显,其对TP的去除率最大能达到59.85%,相比传统的人工湿地去除率提高了27.82%;去除NH

Experimental study on purification of domestic sewage by magnetic field/photocatalytic enhanced constructed wetlands

Constructed wetland has become a widely used sewage treatment method, but there are still defects such as low efficiency, and the coupling of constructed wetland with various strengthening processes has become a research hotspot in recent years. In this paper, the constructed wetlands enhanced by magnetic field and photocatalysis were constructed respectively, and the removal effects of TP, PO43--P, NH4+-N and CODCr in wastewater by constructed wetlands under different influent concentrations and HRT (24 h, 48 h, 72 h) were investigated. The results showed that the application of magnetic field could promote the removal of NH4+-N and CODCr by constructed wetland system. When HRT was 24 ~ 72 h, the removal rates of NH4+-N and CODCr by magnetic field en-hanced constructed wetland could reach 58.77 ~ 96.91% and 41.16 ~ 85.42%, respectively. Photocatalysis has obvious degradation effect on some pollutants in sewage due to the formation of a large number of free radicals, and it’s removal rate of TP could reach 59.85%, which is 27.82% higher than that of traditional constructed wetland. The optimal HRT for removing NH4+-N and CODCr was 72 h, and the highest removal rates were 67.57 % and 89.98 %, respectively, which were 16.77 % and 21.64 % higher than those of traditional constructed wetlands.