摘要
根据北京市雨水地表径流污染的特点,设计了用于去除屋顶和机动车路面雨水径流污染物的多层渗滤介质系统,进行污染雨水净化效果的试验研究.结果表明,系统对屋顶和机动车路面雨水径流中的氮磷污染物有明显的去除效果,NH4+-N、TN、TP的去除率分别达80%、90%、50%以上,出水浓度达到地表水Ⅱ类水质标准;"砂砾料"垫层对TP的去除效果稍好于"无砂混凝土"垫层;雨水径流中氮磷浓度愈高则对氮磷的去除率愈高,雨水径流氮磷浓度变化对氮磷去除效果的影响较小.多层渗滤介质系统通过微生物的硝化和反硝化作用实现生物脱氮是系统去除氮的主要途径;土壤的吸附与沉淀作用是多层渗滤介质系统去除磷的主要途径.系统对城市雨水径流氮磷污染物的净化能力主要发生在垫层及地基土层0.3m以内.
A muhilayer infiltration system was used to effectively remove nitrogen and phosphorus pollutants in urban runoff from roofs and roadways. The average removal rates of NH4^＋ -N, TN and TP were above 80% , 90% and 50% , respectively. The effluent quality met the standard of class Ⅱ for surface water. The TP purifying effects of a gravel and sand padding layer were better than concrete without a sand padding layer. The higher the pollutants concentration in urban runoff, the higher the removal rate, hut the concentration had less influence on removal efficiency. The main removal mechanism for nitrogen was biological nitrogen removal through nitrification and denitrification. Phosphorus in the urban runoff was mainly removed by fixation processes in the soil, such as adsorption and chemical precipitation. The purification process happened mainly at the upper part of the soil column, i.e. in the top 30 cm.
出处
《环境科学学报》
CAS
CSCD
北大核心
2009年第5期960-967,共8页
Acta Scientiae Circumstantiae
基金
中国水利水电科学研究院开放研究基金
国家高技术研究发展计划(No.2007AA06Z351)
"十一五"国家科技支撑计划项目(No.2006BAJ08B04)~~
关键词
多层渗滤介质系统
城市雨水径流
硝化
脱氮除磷
multilayer infiltration system
urban runoff
nitrification
nitrogen and phosphorus removal
