title: Incentive effect of bentonite and concrete admixtures on stabilization/solidification for heavy metal-polluted sediments of Xiangjiang River.
abstract: Solidification is a very effective way to alleviate heavy metal impacts to the environment. In this paper, an improved method was adopted herein for the solidification/stabilization (S/S) of sediments with cement-based additives and low content of cement in S/S materials. Sediments in Xiangjiang River, containing high concentrations of Cu, Cd, and Pb, were solidified/stabilized by binders of cement, fly ash, and bentonite. Admixtures such as sodium lignosulfonate, sodium lauryl sulfate, and triethanolamine were used to improve the bonding properties of S/S, which had never been investigated before. Results demonstrated that the addition of concrete admixtures had significant effects on the S/S of sediments. Sequential extraction method indicates that the concentrations of heavy metals changed significantly after solidification and were more stable over time, with the exception of Pb. In addition, SEM images indicated that the main hydrated product was ettringite. Large quantities of calcium silicate hydrates (CSH) formed and filled the solidified sediment in 60 days. The results provide further insights into the transformation of heavy metals during S/S.
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China.
authors.forename: Ming
authors.initials: M
authors.lastname: Yan
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China. zgming@hnu.edu.cn.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China. zgming@hnu.edu.cn.
authors.forename: Guangming
authors.initials: G
authors.lastname: Zeng
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China. xmli@hnu.edu.cn.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China. xmli@hnu.edu.cn.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Li
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China. 499923379@qq.com.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China. 499923379@qq.com.
authors.forename: Jianmin
authors.initials: J
authors.lastname: He
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China.
authors.forename: Guiqiu
authors.initials: G
authors.lastname: Chen
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China.
authors.forename: Danlian
authors.initials: D
authors.lastname: Huang
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China.
authors.forename: Lin
authors.initials: L
authors.lastname: Tang
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China.
authors.forename: Cui
authors.initials: C
authors.lastname: Lai
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China.
authors.forename: Chang
authors.initials: C
authors.lastname: Zhang
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Li
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China.
authors.forename: Lichao
authors.initials: L
authors.lastname: Wang
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Guo
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Tao
mesh_terms: D001546:Bentonite / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry; D002681:China; D060729:Coal Ash / Q000737:chemistry; D003252:Construction Materials; D019015:Geologic Sediments / Q000737:chemistry*; D019216:Metals, Heavy / Q000032:analysis*; D045483:Rivers / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D017610:Calcium Compounds; D060729:Coal Ash; D019216:Metals, Heavy; D017640:Silicates; D014874:Water Pollutants, Chemical; D001546:Bentonite; C031293:calcium silicate
keywords: Bentonite; Concrete admixtures; Heavy metals; Sediments; Solidification/stabilization