| 陆凡,胡清华,李廷强.生物表面活性剂皂角苷对柴油污染土壤脱附的强化作用[J].农业环境科学学报,2015,34(1):37-43. |
| 生物表面活性剂皂角苷对柴油污染土壤脱附的强化作用 |
| Enhancing Removal Efficiency of Diesel Contaminant from Soil by Biosurfactant Saponin |
| 投稿时间：2014-07-01 |
| DOI：10.11654/jaes.2015.01.006 |
| 中文关键词: 柴油污染土壤 强化作用 SDS TX-100 脱附剂 皂角苷 |
| 英文关键词: diesel contaminated soil enhancement SDS TX-100 desorption agent saponin |
| 基金项目:国家高技术研究发展计划(863计划)(2013AA06A205);环境污染过程与基准教育部重点实验室开放基金(KL-PPEC-2013-04) |
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| 中文摘要: |
| 采用批实验研究了生物表面活性剂皂角苷(Saponin)对柴油污染土壤脱附的强化作用.应用化学热洗原理与正交试验设计,确立了柴油污染土壤脱附的最适实验条件,即助剂硅酸钠浓度为5 g·L-1、70 ℃条件下振荡50 min.在最适条件下皂角苷与SDS复合能显著提高柴油脱附率:当SDS与皂角苷质量比为5:5,总表面活性剂的浓度为1 g·L-1时,柴油脱附率达88.65%,比SDS-TX-100复合脱附剂提高了16.6个百分点.脱附液回用试验表明,经两次回用后,SDS-皂角苷复合脱附液仍能去除土壤中17.6%的柴油.SDS-皂角苷复合脱附剂的残留量显著低于相同浓度的SDS-TX-100复合脱附剂,且经三次淋洗后,脱附剂的残留量从2510 mg·kg-1下降到1790 mg·kg-1.研究结果表明,皂角苷与SDS复合后,不仅能够强化其对柴油污染土壤的脱附效果,提高污染土壤修复效率,而且由于减少了用量,显著降低了其对土壤的二次污染. |
| 英文摘要: |
| Surfactant flushing is one of remediation techniques for petroleum-contaminated soils. In this work, a batch experiment was conducted to evaluate the performance of biosurfactant saponin for enhancing diesel removal from contaminated soil. The optimal flushing conditions were established based on the principles of chemical heat washing and the orthogonal experimental design. They were sodium silicate at 5 g·L-1, temperature at 70 ℃ and vibration time of 50 min. Results showed that under optimal flushing conditions, removal efficiency of diesel from the contaminated soil was greater for SDS-saponin mixed surfactants than that of SDS, TX-100 and SDS-TX-100 mixed surfactants. At mass ratio of 5:5 and total concentration of 1 g·L-1, SDS-saponin mixed surfactants had a removal rate of 88.65%, 16.6% greater than that of SDS-TX-100 mixed surfactants. The second reusing of the surfactant solution could remove up to 17.6 % of diesel from soil. At the same concentrations, residual amounts of SDS-saponin mixed surfactants in soil were lower than those of SDS-TX-100. Three washing reduced the surfactants from 2510 mg·kg-1 to 1790 mg·kg-1. Our results suggest that saponin could reduce surfactant dosage to a greater extent and maintain higher removal efficiencies of diesel fuel. |
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