Abstract
The bioretention pond plays an important role in controlling stormwater runoff pollution. However, the removal efficiency of the traditional bioretention pond is unstable. In this study, we used NaOH (2 mol′L−1) to modify Enteromorpha prolifera biochar (BC), preparing alkali-modified biochar (KBC). We tried to study the removal capacity of biochar as a kind of bioretention filter and optimization of operating conditions of the bioretention pond. The results showed that: (1) When modified biochar was used as the filler medium, the maximum removal rate of TN, NH4 +-N, NO3 --N, NO2 --N in effluent were 59.1%, 79.0%, 54.3%, and 76.7%, respectively; In short, the average removal rate of experimental columns added with primitive biochar increased by 1%-12%. (2) The hydraulic retention time and setting of the saturation region had a clear influence on removing nitrogen from rainwater runoff in the bioretention pond. When TL=2 h, Ds=10 cm, the average removal rates of NH4 +-N, NO3 --N, NO2 --N in effluent reached 80%, 60%, and 70%, respectively.
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