【摘要】 雨水生物滞留系统是路面雨水径流净化的主要技术措施之一。利用土柱模拟试验,通过向人工配制的砂壤土中添加不同含量的生物质炭（0、2%、4%、6%）,并模拟路面雨水径流淋滤,分析去除氮素污染物的效果及影响因素。结果表明,生物质炭的添加量达到2%以上时,可显著增大对路面降雨径流中TN、NH₄⁺-N和NO₃^--N的削减率。生物质炭添加量对TN的去除效果影响不大,但是对NH₄⁺-N的去除效果明显优于NO₃^--N。同时发现,路面雨水径流污染负荷、落干期、植物均会不同程度影响生物滞留系统对氮素污染物的去除效果。更多还原

【Abstract】 Stormwater bioretention system is one of the main technical measures to purify road runoff. Simulated experiment was carried out in soil columns by adding different amounts of biochar （0,2%,4% and 6%）. Leaching of road runoff was simulated,and effects of nitrogen removal and influencing factors were investigated. The results showed that the removal rates of TN,NH₄⁺-N and NO₃^--N could be significantly increased when the dosage of biochar was more than 2%. Moreover,the dosage of biochar had little effect on TN removal,but it had significantly better removal efficiency of NH₄⁺-N than that of NO₃^--N. It was also found that concentration of pollutants,dry period and plants all affected the removal efficiency of nitrogen pollutants by stormwater bioretention system to some extent.更多还原