Jelusic Masa, Lestan Domen
Agronomy Department, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia.
Agronomy Department, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia.
Chemosphere. 2015 Nov;138:1001-7. doi: 10.1016/j.chemosphere.2014.12.047. Epub 2015 Jan 8.
Soils highly contaminated with toxic metals are currently treated as waste despite their potential inherent fertility. We applied EDTA washing technology featuring chelant and process water recovery for remediation of soil with 4037, 2527, and 26 mg kg(-1) of Pb, Zn and Cd, respectively in a pilot scale. A high EDTA dose (120 mmol kg(-1) of soil) removed 70%, 15%, and 58% of Pb, Zn, and Cd, respectively, and reduced human oral bioaccessibility of Pb below the limit of quantification and that of Zn and Cd 3.4 and 3.2 times. In a lysimeters experiment, the contaminated and remediated soils were laid into two garden beds (4×1×0.15 m) equipped with lysimeters, and subjected to cultivation of ornamental plants: Impatiens walleriana, Tagetes erecta, Pelargonium×peltatum, and Verbena×hybrida and grasses: Dactylis glomerata, Lolium multiflorum, and Festuca pratensis. Plants grown on remediated soil demonstrated the same or greater biomass yield and reduced the uptake of Pb, Zn and Cd up to 10, 2.5 and 9.5 times, respectively, compared to plants cultivated on the original soil. The results suggest that EDTA remediation produced soil suitable for greening.
尽管含有潜在固有肥力，但目前高度受有毒金属污染的土壤仍被当作废物处理。我们采用了具有螯合剂和工艺水回收功能的乙二胺四乙酸（EDTA）洗涤技术，在中试规模下修复分别含有4037、2527和26 mg kg⁻¹铅、锌和镉的土壤。高剂量的EDTA（120 mmol kg⁻¹土壤）分别去除了70%的铅、15%的锌和58%的镉，并将铅的人体口腔生物可及性降低至定量限以下，将锌和镉的人体口腔生物可及性分别降低了3.4倍和3.2倍。在渗漏计实验中，将受污染和修复后的土壤放入两个配备渗漏计的花园床（4×1×0.15米）中，用于种植观赏植物：凤仙花、万寿菊、天竺葵和杂交马鞭草，以及草本植物：鸭茅、多花黑麦草和草地羊茅。与在原始土壤上种植的植物相比，在修复后的土壤上生长的植物表现出相同或更高的生物量产量，并且对铅、锌和镉的吸收分别减少了10倍、2.5倍和9.5倍。结果表明，EDTA修复产生了适合绿化的土壤。
