Abstract
Under continuous observation of the TN, NH3-N and NO3-N levels of the influent and effluent, as well as the changes in permeability coefficients of bioretention tanks with different engineered soils, the nitrogen removal capacity and mechanism of bioretention tanks were investigated. The research showed that the bioretention system had advantages in the nitrogen removal of rainfall runoff, and the average removal rate rose from 50% during the stabilization stage to up to 70% after running for 9 months. In addition, the permeability coefficients of bioretention decreased as the nitrogen removal capacity increased, with the permeability coefficients decreased by as much as 50% or even up to 90%. This study is of great importance for further exploration on the mechanism and application of bioretention technology in the purification of rainfall, and may play a positive role in promoting an environmentally-friendly society as well as sustainable development.
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