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.The constructed wetlands enhanced by magnetic field and photocatalysis were constructed respectively,and the removal effects of TP,PO4--P,NH4+-N and CODCr in wastewater by constructed wetlands under different influent concentrations and HRT(hydraulic retention time)(24 h,48 h,72 h)were investigated.The results show that the application of magnetic field can promote the removal of NH4+-N and CODCr by constructed wetland system.When HRT is 24～72 h,the removal rates of NH4+-N and CODCr by magnetic field enhanced constructed wetland can 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.
constructed wetlanddomestic sewagephotocatalysismagnetic field
万方数据
维普
