【摘要】 为提高生物滞留池对初期雨水径流的处理效果,通过改进传统结构提出了一种廊道式结构.对比在不同条件下2种结构对污染物去除效果.在1a、2a、5a3种降雨重现期对应的水力负荷下对化学需氧量(Chemical Oxygen Demand,COD)有机物的去除率为92.3%、83.1%、78.1%,对NH3-N的去除率为96.1%、95.9%、93.7%,对总磷(Total Phosphorus,TP)的去除率89.7%、86.5%、69.8%.传统结构在1a、2a、5a3种降雨重现期下的水力负荷对COD的去除率为90.6%、76.1%、71.4%,对NH3-N的去除率为90.2%、92.5%、94.1%,对TP的去除率85.7%、87.1%、86.6%.在5d、10d、20d干旱期后,传统结构出水COD浓度更低.廊道式结构恢复处理能力更好且出水浓度波动性较低.而30d干旱期对2种结构COD出水影响都巨大,尤其是传统结构.在5d、20d、30d干旱期后,廊道式结构在处理NH3-N上受到的影响更小.在10d干旱期后,传统结构对处理NH3-N有更好效果.在处理NH3-N方面,廊道式结构比传统结构更适应干旱期的变化,并且在整个干湿交替期表现更好.在5d、10d、30d干旱期后,传统结构在处理TP上受到的影响更小.在20d干旱期后,廊道式结构几乎不受影响.在整个干湿交替期,廊道式结构处理效果更好,更稳定.更多还原

【Abstract】 In order to improve the treatment effect of the bioretention on the initial rainwater runoff,a corridor structure was proposed by improving the traditional structure.The effects of two structures on pollutant removal were compared under different conditions.The removal rate of COD in the corridor structure under the hydraulic load corresponding to the three types of rainfall recurrence periods 1 a,2 a,5 ais 92.3%,83.1%,78.1%,the removal rate of NH₃-N is 96.1%,95.9%,93.7%and the removal rate of TP is 89.7%,86.5%,69.8%.The removal rate of COD in the traditional structure under the hydraulic load corresponding to the three types of rainfall recurrence periods 1 a,2 a,and 5 ais 90.6%,76.1%,71.4%,the removal rate of NH₃-N is 90.2%,92.5%,94.1%,and the removal rate of TP is 85.7%,87.1%,86.6%.After 5 days,10 days,20 days of drought period,the traditional structure effluent COD concentration is lower.The improved structure has better recovery capacity and lower effluent concentration volatility.The 30-day dry period has a great impact on the COD effluent of the two structures,especially the traditional structure.After 5-day,20-day,and 30-day drought periods,the corridor structure was less affected in the treatment of NH₃-N.The traditional structure performed better during the 10-day drought period in the treatment of NH₃-N.In the treatment of NH₃-N,the corridor structure is more adaptable to changes in the dry period than the traditional structure,and performs better throughout the wet and dry alternation period.After 5-day,10-day,and 30-day drought periods,the traditional structure was less affected in the treatment of TP.After 20-day dry period,the corridor structure is almost unaffected.In the entire dry and wet alternating period,the corridor structure treatment effect is better and more stable.更多还原