摘要
为研究填料类型与组成对绿色屋顶设施出流中营养物质淋失的影响,构建了5种粗放式绿色屋顶装置,在模拟降雨条件下监测设施出流的水量和水质变化。结果表明,在绿色屋顶的填料中增加有机质(泥炭),可有效保障设施中植物的正常生长;出流中的TN和浊度均随降雨量的增加而减少,当累计进水量达到0.75倍空床体积(约75 mm降雨量)后趋于稳定;累计进水量至3倍空床体积(约300 mm降雨量)时,出流中COD、TP和NH+4-N浓度均呈现明显波动,无明显变化规律,且出流浓度均高于地表水Ⅴ类标准;从长期运行效果看,填料深度对装置出流污染物无显著影响;采用泥炭土作为有机质改良填料的绿色屋顶设施出流TN累计淋出量小于传统屋面径流污染物累计排放量,但其出流中COD和TP累计淋出量远高于传统屋面径流污染物累计排放量和仅采用田园土的绿色屋顶装置累计淋出量。总体来看,粗放式绿色屋顶装置能够在一定程度上滞留氮,但表现为磷的释放源。
In order to investigate the influence of substrate type and composition on nutrients leaching from green roof,five extensive green roofs were constructed to monitor the effluent quantity and quality during artificial rainfall. Results indicated that adding organic matter( peat) to extensive green roof substrate could ensure plants' growth. The concentrations of TN and turbidity decreased with the increase of cumulative rainfall volume,and tended to be stable when the cumulative rainfall reached 75 mm. But the concentrations of COD,TP and NH_4^+-N didn't show an obvious trend when the cumulative rainfall reached 300 mm,and COD,TP and NH_4^+-N concentrations were much higher than class Ⅴ standards of surface water. Considering the operation effect in the long-term,substrate depths had no significant influence on TN and TP concentrations. The cumulative TN leaching mass of green roofs adding organic matter( peat) was lower than conventional roof runoff pollution discharge,but COD and TP were much higher than conventional roof runoff pollution discharge and green roofs with only pastoral soil. Extensive green roofs in this study had an ability to retain nitrogen,but could be regarded as a source of phosphorus discharge.
出处
《中国给水排水》
CAS
CSCD
北大核心
2018年第7期128-132,共5页
China Water & Wastewater
基金
国家自然科学基金资助项目(51608026)
北京市科技计划课题(D161100005916004)
高精尖创新中心科研项目(UDC2016040100)
北京建筑大学科研基金资助项目(00331616049)
北京建筑大学金字塔人才培养工程项目
