摘要
采用沙培实验,探讨4种草本植物(黑麦草、地毯草、早熟禾、高羊茅)对人工模拟雨水中重金属锌的吸收富集和去除效果,为植物滞留系统筛选草本植物提供科学依据。实验分析测定不同植物滞留系统介质、不同入口浓度情况下,植物地上部与根部锌含量及锌的去除率。结果表明:4种草本植物对人工模拟降雨径流中的锌均有较好的去除效果,锌的平均去除率为84.65%~91.12%。不同草本植物去除人工模拟降雨径流中锌的能力,从强到弱的顺序依次为:早熟禾>黑麦草>地毯草>高羊茅。其中,4种草本植物对锌的去除率随入口浓度的增加而增加;对于同一种草本植物同样的入口浓度情况下,沙土Ⅰ为最佳土壤介质,具有最佳去除锌能力。4种草本植物地上部和地下部锌累积量分别为419.19~960.98μg和569.61~1 024.11μg;其中黑麦草锌累积总量最高,其次是地毯草,最低为早熟禾。综合考虑污染物去除率和锌在植物体内的累积量,交替种植早熟禾和黑麦草可提高植物滞留系统去除锌的能力且有利于延长植物滞留系统寿命。
The Zinc bioaccumulation and removal efficiency by four herbaceous plants( Lolium perenne,Axonopus compressus, Festuca elat,and Poa annua) in bioretention were explicated through a pot experiment. The study provided scientific basis for the biorention plant selection. The conditions of different soil media and different inflow concentration were considered in the pot experiment to analyze the removal efficiency and bioaccumulation concentration of zinc by the four herbaceous plants. The results showed that the average removal rate of zinc in the simulated rain was 84. 65% ~ 91. 12%. The order removal capacity of the four herbaceous plants was: Poa annua > Lolium perenne > Axonopus compressus > Festuca elat. As inflow concentration increasing,the zinc removal rates by the four herbaceous plants were increased. And the sandⅠwas the best media. The zinc bioaccumulations in shoots and roots of four herbaceous plants were 419. 19 ~ 960. 98 μg and 569. 61 ~ 1 024. 11 μg, respectively. The highest accumulated content of zinc was in Lolium perenne,and the lowest in Poa annua. The comprehensive evaluation results showed that planting the Poa annua and Lolium perenne alternately in the bioretention could improve zinc removal efficiency and prolong the working life of bioretention.
出处
《环境工程》
CAS
CSCD
北大核心
2014年第4期22-26,共5页
Environmental Engineering
基金
国家自然科学基金项目(50939001
51079004)
国家重点基础研究发展规划项目(2010CB951104)
高校博士点基金博导类项目(20100003110024)
长江学者和创新团队项目(IRT0809)
内蒙古工业大学青年基金项目(X201217)
