Rhamnolipid Foam Enhanced Remediation of Cadmium and Nickel Contaminated Soil
Rhamnolipid Foam Enhanced Remediation of Cadmium and Nickel Contaminated Soil
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DOI：
10.1023/b:wate.0000038904.91977.f0
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发表时间：
2004-09
期刊：
影响因子：
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通讯作者：
Suiling Wang;C. Mulligan
中科院分区：
文献类型：
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作者：
Suiling Wang;C. Mulligan
进行柱实验以评估使用鼠李糖脂泡沫从受 Cd (1706 ppm) 和 Ni (2010 ppm) 污染的沙土中去除重金属 (Cd 和 Ni) 的可行性。初始pH值为10.0的0.5%鼠李糖脂溶液在用20孔体积的溶液冲洗后产生的泡沫获得了最佳结果。这些条件去除了 73.2% 的 Cd 和 68.1% 的 Ni。作为比较，研究了化学表面活性剂 Triton X-100 产生的泡沫的去除效率。在相同条件下去除了65.5%的Cd和57.3%的Ni。经过 20 孔体积液体溶液冲洗后，不产生泡沫的 0.5% 鼠李糖脂（初始 pH 10.0）去除了 61.7% 的 Cd 和 51.0% 的 Ni，而 0.5% Triton X-100（初始 pH 10.0）去除了 52.8% 的 Cd 和 45.2% 的 Ni。还使用仅调节 pH 值的蒸馏水冲洗受污染的土壤柱作为对照。它去除了 17.8% 的 Cd 和 18.7% 的 Ni。本研究表明鼠李糖脂泡沫技术可以成为修复镉镍污染土壤的有效手段。
Column experiments were conducted to evaluate the feasibility of using a rhamnolipid foam to remove heavy metals (Cd and Ni) from a sandy soil contaminated with Cd (1706 ppm) and Ni (2010 ppm). Best results were obtained from the foam generated by a 0.5% rhamnolipid solution with an initial pH value of 10.0 after flushing with 20-pore-volume of solution. These conditions removed 73.2% of the Cd and 68.1% of the Ni. Removal efficiencies by foam generated by a chemical surfactant, Triton X-100, were investigated as a comparison. It removed 65.5% of the Cd and 57.3% of the Ni under the same conditions. After a 20-pore-volume liquid solution flushing, 0.5% rhamnolipid (initial pH 10.0) without foam generation removed 61.7% of the Cd and 51.0% of the Ni, whereas 0.5% Triton X-100 (initial pH 10.0) removed 52.8% of the Cd and 45.2% of the Ni. Distilled water with adjusted pH only was also used to flush through the contaminated soil column as a control. It removed 17.8% of the Cd and 18.7% of the Ni. This study shows that rhamnolipid foam technology can be an effective means for the remediation of cadmium and nickel contaminated soil.