花卉植物修复剩余污泥中重金属的实验研究

文章采用徐州四种本土花卉植物,通过盆栽试验研究花卉植物对徐州姚庄污水处理厂剩余污泥中重金属的修复效果。主要研究结论如下:(1)吊兰在整个实验期内生长旺盛,污泥中重金属对其无毒害作用,相反金盏菊、矮牵牛、三色堇都受到不同程度的重金属毒害作用;(2)从积累特征分析,四种花卉植物对各种重金属均表现出一定的富集效果和转运效果,但是没有达到超积累植物的标准;(3)四种花卉植物茎叶部中,吊兰对Cu、Zn、Pb的积累量最大,最大值分别为2.58mg/plant、5.76mg/plant、0.29mg/plant,金盏菊对Cd的积累量最大,最大值为0.200mg/plant;四种花卉植物根部中,吊兰对Cu、Zn、Pb、Cd的积累量最大,最大值分别为3.12mg/plant、8.77mg/plant、0.29mg/plant、0.24mg/plant;(4)从四种花卉植物对重金属的耐性、积累特征和积累总量来看,吊兰的富集效果优于其它三种花卉植物。

Experimental Study on Ornamental Plants Remediation of Heavy Metals in Sewage Sludge

4 native ornamental plants of Xuzhou,Shandong Province were selected to study the remediation effects of heavy metals in sewage sludge of Yaozhuang Wastewater Treatment Plant through pot experiments. Results showed that heavy metals in sewage sludge had no poison to Chlorophytum comosum which grew well in the period of experiment,while Calendula officinalis L,Petunia hyhrida Vilm and Viola tricolor Linn were subject to some extent poisoning effect of heavy metals. Analyzing from accumulation property,4 ornamental plants had some effects of enriching and transfer on heavy metals,but did not reach the standard of hyperaccumulators. In the shoots of 4 ornamental plants,Chlorophytum comosum had the maximum amounts of accumulation on Cu,Zn,and Pb,with total amounts of 2.58mg/plant,5.76mg/plant and 0.29mg /plant respectively. Calendula officinalis L had the maximum amount of accumulation on Cd,with amount of 0.200mg/plant. In the roots of 4 ornamental plants, Chlorophytum comosum had the maximum amounts of accumulation on Cu,Zn,Pb and Cd,with total amounts of 3.12mg/plant, 8.77mg/plant,0.29mg/plant and 0.24mg/plant respectively. Analyzing from duration,accumulation property and total amounts of accumulation,Chlorophytum comosum had better phytoremediation effects than other three ornamental plants.