Research on High-efficient Nitrogen Removal of Pollutants in Rainwater Runoff by Modified Glass Pumice
This study investigated the efficient nitrogen removal of pollutants in rainwater runoff by modi-fied glass pumicer.Zeolite,vermiculite,ceramsite,ordinary glass pumice,and modified glass pumice were used as filtration materials,this study developed a system composed of artificial rainwater and infiltration column to simulate the purification effect of bioretention pool on rainwater runoff at different operation time(5,10,20,30,40 h)and different outlets,to study the pollutant removal effect of TN and NH4+-N in rainwater runoff of modified glass pumice.The results showed that the TN removal rate of the modified glass pumice∶zeolite∶vermiculite∶ceramsite=4∶2∶2∶2(volume ratio)layered filling filtration column reached 92.71%,while the NH4+-N removal rate of the modified glass pumice∶zeolite∶vermiculite∶ceramsite=4∶2∶2∶2(volume ratio)mixed filling filtration column reached 92.81%,and the TN and NH4+-N content all met the Class Ⅲ standard of Environmental Quality Standard for Surface Water(GB 3838-2002).The addition of modified glass pumice to the basic filtration materials has a good filtration adsorption effect on the four pollutants and ef-fectively improves the permeability of filtration materials.In a comprehensive view,the best removal effect is achieved at the depth of 65 cm of the substrate layer,when running for 10 h.
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