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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Experimental study on interaction effects between surfactant and organic contaminants in cohesive soils

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黏性土中表面活性剂与有机污染物相互作用特征

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Mar.2023, Vol.46 No.3: 378-383

DOI: 10.3969/j.issn.1003-5060.2023.03.015

Authors

WANG Bida, XU Long, KANG Bo, ZHA Fusheng

(School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: In order to reveal the interaction effects between surfactant and organic contaminants in cohesive soils, this paper selected sodium lauroylsarcosinate (SLS) as surfactant and methyl tert-butyl ether (MTBE) as organic contaminants to systematically study the solubilization and desorption of surfactant on organic contaminants in cohesive soils. The results show that the solubilization effect of surfactant on MTBE increases rapidly and tends to be stable with the increase of its concentration; the adsorption of cohesive soils on contaminants is significant, and Henry model can be used to obtain its adsorption characteristics and distribution coefficient; when the mass concentration of surfactant is low, the adsorption of soil on contaminants is strong, when it increases to 1 300 mg/L, surfactant will promote the desorption of contaminants; the low mass concentration surfactant does not significantly affect the overall contamination degree of soil, but the significant solubilization will promote the migration of contaminants and make their distribution more uniform; the significant desorption effect of high mass concentration surfactant on contaminants will increase the mass concentration of dissolved MTBE in soil. The results can provide reference for the study of site remediation of organic contaminants.

Keywords: surfactant; cohesive soil; organic contaminants; solubilization; adsorption/desorption

作者信息

汪必达，许龙，康博，查甫生

（合肥工业大学资源与环境工程学院，安徽合肥230009）

摘要和关键词

摘要: 为揭示黏性土中表面活性剂与有机污染物的相互作用特征，文章选用N-月桂酰肌氨酸钠（sodium lauroylsarcosinate，SLS）为表面活性剂、甲基叔丁基醚（methyl tert-butyl ether，MTBE）为有机污染物，系统研究表面活性剂对黏性土中有机污染物的增溶、解吸作用。试验结果表明：表面活性剂对MTBE的增溶作用随其质量浓度增加而快速增大并趋于稳定；黏性土对污染物的吸附作用显著，可使用Henry模型获取其吸附特性及分配系数；表面活性剂质量浓度较低时，土体对污染物吸附作用较强，当增至1300 mg/L后，表面活性剂将促进污染物解吸；低质量浓度表面活性剂并未显著影响土体整体污染程度，但显著的增溶作用将促进污染物迁移，使其分布更趋均匀；高质量浓度表面活性剂对污染物的显著解吸作用将增加土体中溶解态MTBE质量浓度。研究结果可为有机污染物场地修复研究提供参考。

关键词: 表面活性剂；黏性土；有机污染物；增溶；吸附/解吸

Funding

国家重点研发计划资助项目（2019YFC1509903）；国家自然科学基金资助项目（41807239；41877262）

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