Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Poland.
Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Poland.
Chemosphere. 2015 Oct;136:42-9. doi: 10.1016/j.chemosphere.2015.03.083. Epub 2015 May 15.
Although commercially available biosurfactants are environmentally friendly and effectively remove heavy metals from soil, they are costly. Therefore, this study investigated whether inexpensive humic substances (HS) from sewage sludge compost could effectively remove copper (Cu) and cadmium (Cd) from highly contaminated sandy clay loam (S1) and clay (S2). The optimum HS concentration and pH were determined, as well process kinetics. Under optimum conditions, a single washing removed 80.7% of Cu and 69.1% of Cd from S1, and 53.2% and 36.5%, respectively, from S2. Triple washing increased removal from S1 to almost 100% for both metals, and to 83.2% of Cu and 88.9% of Cd from S2. Triple washing lowered the potential ecological risk (Er(i)) of the soils, especially the risk from Cd. HS substances show potential for treating soils highly contaminated with heavy metals, and HS from other sources should be tested with these and other contaminants.
虽然市售的生物表面活性剂环保且能有效去除土壤中的重金属，但价格昂贵。因此，本研究探讨了来自污水污泥堆肥的廉价腐殖物质（HS）是否能有效去除高污染砂壤土（S1）和粘土（S2）中的铜（Cu）和镉（Cd）。确定了最佳 HS 浓度和 pH 值以及过程动力学。在最佳条件下，单次洗涤可去除 S1 中 80.7%的 Cu 和 69.1%的 Cd，分别去除 S2 中 53.2%和 36.5%的 Cu 和 Cd。三次洗涤使 S1 中两种金属的去除率几乎达到 100%，S2 中 Cu 的去除率为 83.2%，Cd 的去除率为 88.9%。三次洗涤降低了土壤的潜在生态风险（Er(i)），尤其是 Cd 的风险。HS 物质显示出处理重金属污染土壤的潜力，应使用这些物质和其他污染物对其他来源的 HS 进行测试。
