植生復育重金屬污染場址之案例評析

A Case Study of Heavy Metal Pollution Site Using Phytoremediation Technology

本研究以植生復育方式整治重金屬污染場址，該場址主要污染物為鋅、鉻、銅及鎳。研究最主要目的是以深根系搭配淺根系植物降低土壤重金屬含量。而復育植物其吸收量依序為Zn＞Cu＞Cr＞Ni。最後以所有復育植物修剪之植體生質量與重金屬濃度計算其吸收量，總吸收量為Zn（618.1 g）＞Cu（12.07 g）＞Cr（11.39 g）＞Ni（10.07 g）。至於復育植物對重金屬之單株移除量，木本植物依序為白楊2.62 g＞血桐0.48 g＞構樹0.37 g，而草本植物則為牛筋草1871 μg＞太陽麻224 μg。至於復育植物每年自每公斤土壤中所移除之重金屬分別為Zn（2.12 mg）＞Cu（0.041 mg）＞Cr（0.039 mg）＞Ni（0.035 mg）。

The project aims to use phytoremediation method to treat heavy metalcontaminated sites, the sites of major pollutants as zinc, chromium, copper and nickel.The main objective of the project is to reduce the heavy metal content of the soil byplanting combining deep root and shallow root plants. The plant’s phytoremediationuptake heavy metals sequence are Zn＞Cu＞Cr＞Ni. Finally, we use all experimentplant pruning plant biomass to calculate the uptake of heavy metals concentration, thetotal uptake of Zn(618.1 g)＞Cu(12.07 g)＞Cr(11.39 g)＞Ni(10.07 g). Theheavy-metal removal efficiency of the woody plants was found to be Poplars＞Macaranga＞Papermulberry and Eleusine indica＞Sun Hemp for the herbaceousplants. respectively, for the heavy metals removed from the soil per kilogram of soil.Zn(2.12 mg)＞Cu(0.041 mg)＞Cr(0.039 mg)＞Ni(0.035 mg).