a Department of Civil Engineering , University of Manitoba , Winnipeg , Canada.
b Department of Biological Sciences , University of Manitoba , Winnipeg , Canada.
Int J Phytoremediation. 2019;21(9):831-839. doi: 10.1080/15226514.2019.1568383. Epub 2019 May 2.
Landfilling has been widely used for solid waste disposal; however, the generation of leachate can pose a major threat to the surrounding environment in the form of soil salinity. Two native plants of North America (alkaligrass) and (cattail) were selected in this study to investigate bioaccumulation of sodium (Na) and chloride (Cl) under controlled greenhouse conditions. The treatments include irrigation of the plants using fertilizer (F), landfill leachate (LL), and tap water (control, C). Plants cultivated after one season (12 weeks) were harvested by separating aboveground tissues and roots, and soil from each treatment was collected for analysis. The results show that alkaligrass irrigated with LL had 2.13% more biomass yield than control, but 17.63% less than that with F. However, cattail yielded 19.70% more biomass with the irrigation of LL than C and 3.04% less compared to F. Alkaligrass and cattail accumulated 6.85 and 7.00 g Na/Kg biomass with the irrigation of LL, respectively. Alkaligrass and cattail irrigated with LL accumulated 120.14% and 94.47% more Cl than C. When alkaligrass and cattail were irrigated with LL, the electrical conductivity of soil was reduced by 71.70% and 45.36%, respectively. This study demonstrated that using North American native could be a cost-effective and promising approach for phytoremediation of landfill leachate.
垃圾填埋场已被广泛应用于固体废物处理；然而，渗滤液的产生会以土壤盐渍化的形式对周围环境造成重大威胁。本研究选择了两种北美本地植物（碱茅草）和（香蒲），在受控温室条件下研究了钠（Na）和氯（Cl）的生物积累。处理方法包括用肥料（F）、垃圾渗滤液（LL）和自来水（对照，C）灌溉植物。经过一个季节（12 周）的栽培后，将植物的地上组织和根以及每个处理的土壤分别收获并进行分析。结果表明，用 LL 灌溉的碱茅草的生物量比对照多 2.13%，但比用 F 灌溉的少 17.63%。然而，香蒲用 LL 灌溉的生物量比 C 多 19.70%，比 F 少 3.04%。用 LL 灌溉的碱茅草和香蒲分别积累了 6.85 和 7.00 g Na/Kg 生物质的 Na。用 LL 灌溉的碱茅草和香蒲分别积累了比 C 多 120.14%和 94.47%的 Cl。当用 LL 灌溉碱茅草和香蒲时，土壤的电导率分别降低了 71.70%和 45.36%。本研究表明，使用北美本地植物可能是一种具有成本效益和前景的垃圾渗滤液植物修复方法。
