Surfactant-enhanced flushing enhances colloid transport and alters macroporosity in diesel-contaminated soil

doi:10.1016/j.jes.2017.06.006

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	Surfactant-enhanced flushing enhances colloid transport and alters macroporosity in diesel-contaminated soil
	Guan, Zhuo1,2 ; Tang, Xiang-Yu1 ; Nishimura, Taku 2; Katou, Hidetaka 3; Liu, Hui-Yun1,4 ; Qing, Jing 1,5
刊名	JOURNAL OF ENVIRONMENTAL SCIENCES
	2018-02-01
卷号	64 页码:197-206
关键词	Surfactant-enhanced flushing Diesel Colloid transport Macropores Pore structure
ISSN号	1001-0742
DOI	10.1016/j.jes.2017.06.006
英文摘要	Soil contamination by diesel has been often reported as a result of accidental spillage, leakage and inappropriate use. Surfactant-enhanced soil flushing is a common remediation technique for soils contaminated by hydrophobic organic chemicals. In this study, soil flushing with linear alkylbenzene sulfonates (LAS, an anionic surfactant) was conducted for intact columns (15 cm in diameter and 12 cm in length) of diesel-contaminated farmland purple soil aged for one year in the field. Dynamics of colloid concentration in column outflow during flushing, diesel removal rate and resulting soil macroporosity change by flushing were analyzed. Removal rate of n-alkanes (representing the diesel) varied with the depth of the topsoil in the range of 14%-96% while the n-alkanes present at lowconcentrations in the subsoil were completely removed by LAS-enhanced flushing. Much higher colloid concentrations and larger colloid sizes were observed during LAS flushing in column outflow compared to water flushing. The X-ray micro-computed tomography analysis of flushed and unflushed soil cores showed that the proportion of fine macropores (30-250 mu m in diameter) was reduced significantly by LAS flushing treatment. This phenomenon can be attributed to enhanced clogging of fine macropores by colloids which exhibited higher concentration due to better dispersion by LAS. It can be inferred from this study that the application of LAS-enhanced flushing technique in the purple soil region should be cautious regarding the possibility of rapid colloid-associated contaminant transport via preferential pathways in the subsurface and the clogging of water-conducting soil pores. (C) 2017 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000427593900021
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/20693]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
通讯作者	Tang, Xiang-Yu; Nishimura, Taku
作者单位	1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Sichuan, Peoples R China 2.Univ Tokyo, Grad Sch Agr & Life Sci, Dept Biol & Environm Engn, Lab Soil Phys & Soil Hydrol, Tokyo 1138657, Japan 3.Natl Agr & Food Res Org, Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Southwest Jiaotong Univ, Fac Geosci & Environm Engn, Chengdu 611756, Sichuan, Peoples R China
推荐引用方式 GB/T 7714	Guan, Zhuo,Tang, Xiang-Yu,Nishimura, Taku,et al. Surfactant-enhanced flushing enhances colloid transport and alters macroporosity in diesel-contaminated soil[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2018,64:197-206.
APA	Guan, Zhuo,Tang, Xiang-Yu,Nishimura, Taku,Katou, Hidetaka,Liu, Hui-Yun,&Qing, Jing.(2018).Surfactant-enhanced flushing enhances colloid transport and alters macroporosity in diesel-contaminated soil.JOURNAL OF ENVIRONMENTAL SCIENCES,64,197-206.
MLA	Guan, Zhuo,et al."Surfactant-enhanced flushing enhances colloid transport and alters macroporosity in diesel-contaminated soil".JOURNAL OF ENVIRONMENTAL SCIENCES 64(2018):197-206.