Investigating colloid-associated transport of cadmium and lead in a clayey soil under preferential flow conditions

Colloids have a high adsorption capacity and can be mobile under preferential flow, and so may facilitate heavy metal migration. Heavy metal migration with soil colloids in a clayey soil under preferential flow conditions was investigated through experiments. Adsorption tests were carried out to det...

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Autores principales:	Wenjie Zhang, Fengyong Jiang, Wenjing Sun
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	co-leaching heavy metals preferential flow soil colloid Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/207af06f93e4486d96ff27afb49bfd4d
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spelling	oai:doaj.org-article:207af06f93e4486d96ff27afb49bfd4d2021-11-23T18:41:03ZInvestigating colloid-associated transport of cadmium and lead in a clayey soil under preferential flow conditions0273-12231996-973210.2166/wst.2021.441https://doaj.org/article/207af06f93e4486d96ff27afb49bfd4d2021-11-01T00:00:00Zhttp://wst.iwaponline.com/content/84/9/2486https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Colloids have a high adsorption capacity and can be mobile under preferential flow, and so may facilitate heavy metal migration. Heavy metal migration with soil colloids in a clayey soil under preferential flow conditions was investigated through experiments. Adsorption tests were carried out to determine the adsorption of Cd2+ and Pb2+ to the clay and colloids. The preferential flow characteristics in the soil column were investigated by dye tracing tests. The mobility of soil colloids in the soil column was studied by breakthrough tests. Leaching tests of cadmium and lead with and without colloids were carried out. The adsorption tests showed that soil colloids adsorbed more cadmium and lead than the silty clay. The dye tracing tests showed that moderate preferential flow in the soil column can be obtained by choosing clod-size distribution and dry density. The co-leaching test showed that the outflow of cadmium and lead was 1.49 and 33.88 times greater with colloids than without, respectively. The heavy metals adsorbed onto clay and the pore concentrations were both lower with colloids than without, indicating more heavy metals migrated downward with colloids. The migration of cadmium and lead was greatly enhanced by colloids under preferential flow conditions. HIGHLIGHTS Soil columns with preferential flow path were constructed with soil clods.; Preferential flow in the soil column was investigated by dye tracing tests.; The mobility of soil colloids in the soil column was studied.; Leaching tests of Cd2+ and Pb2+ with and without colloids were carried out.; Breakthrough curves, the adsorbed heavy metals and pore solution concentrations were analyzed.;Wenjie ZhangFengyong JiangWenjing SunIWA Publishingarticleco-leachingheavy metalspreferential flowsoil colloidEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 9, Pp 2486-2498 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	co-leaching heavy metals preferential flow soil colloid Environmental technology. Sanitary engineering TD1-1066
spellingShingle	co-leaching heavy metals preferential flow soil colloid Environmental technology. Sanitary engineering TD1-1066 Wenjie Zhang Fengyong Jiang Wenjing Sun Investigating colloid-associated transport of cadmium and lead in a clayey soil under preferential flow conditions
description	Colloids have a high adsorption capacity and can be mobile under preferential flow, and so may facilitate heavy metal migration. Heavy metal migration with soil colloids in a clayey soil under preferential flow conditions was investigated through experiments. Adsorption tests were carried out to determine the adsorption of Cd2+ and Pb2+ to the clay and colloids. The preferential flow characteristics in the soil column were investigated by dye tracing tests. The mobility of soil colloids in the soil column was studied by breakthrough tests. Leaching tests of cadmium and lead with and without colloids were carried out. The adsorption tests showed that soil colloids adsorbed more cadmium and lead than the silty clay. The dye tracing tests showed that moderate preferential flow in the soil column can be obtained by choosing clod-size distribution and dry density. The co-leaching test showed that the outflow of cadmium and lead was 1.49 and 33.88 times greater with colloids than without, respectively. The heavy metals adsorbed onto clay and the pore concentrations were both lower with colloids than without, indicating more heavy metals migrated downward with colloids. The migration of cadmium and lead was greatly enhanced by colloids under preferential flow conditions. HIGHLIGHTS Soil columns with preferential flow path were constructed with soil clods.; Preferential flow in the soil column was investigated by dye tracing tests.; The mobility of soil colloids in the soil column was studied.; Leaching tests of Cd2+ and Pb2+ with and without colloids were carried out.; Breakthrough curves, the adsorbed heavy metals and pore solution concentrations were analyzed.;
format	article
author	Wenjie Zhang Fengyong Jiang Wenjing Sun
author_facet	Wenjie Zhang Fengyong Jiang Wenjing Sun
author_sort	Wenjie Zhang
title	Investigating colloid-associated transport of cadmium and lead in a clayey soil under preferential flow conditions
title_short	Investigating colloid-associated transport of cadmium and lead in a clayey soil under preferential flow conditions
title_full	Investigating colloid-associated transport of cadmium and lead in a clayey soil under preferential flow conditions
title_fullStr	Investigating colloid-associated transport of cadmium and lead in a clayey soil under preferential flow conditions
title_full_unstemmed	Investigating colloid-associated transport of cadmium and lead in a clayey soil under preferential flow conditions
title_sort	investigating colloid-associated transport of cadmium and lead in a clayey soil under preferential flow conditions
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/207af06f93e4486d96ff27afb49bfd4d
work_keys_str_mv	AT wenjiezhang investigatingcolloidassociatedtransportofcadmiumandleadinaclayeysoilunderpreferentialflowconditions AT fengyongjiang investigatingcolloidassociatedtransportofcadmiumandleadinaclayeysoilunderpreferentialflowconditions AT wenjingsun investigatingcolloidassociatedtransportofcadmiumandleadinaclayeysoilunderpreferentialflowconditions
_version_	1718416140273713152

Investigating colloid-associated transport of cadmium and lead in a clayey soil under preferential flow conditions

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