NDLI: Remediation of trichloroethylene-contaminated groundwater by three modifier-coated microscale zero-valent iron.

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Remediation of trichloroethylene-contaminated groundwater by three modifier-coated microscale zero-valent iron.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Zheng, Xilai Shao, Haibing Han, Jun Kolditz, Olaf Xin, Jia
Description	Country affiliation: China Author Affiliation: Han J ( Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Qingdao, 266100, China.); Xin J ( College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China.); Zheng X ( Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Qingdao, 266100, China.); Kolditz O ( College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China.); Shao H ( Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Qingdao, 266100, China. zhxilai@ouc.edu.cn.)
Abstract	Building a microscale zero-valent iron (mZVI) reaction zone is a promising in situ remediation technology for restoring groundwater contaminated by trichloroethylene (TCE). In order to determine a suitable modifier that could not only overcome gravity sedimentation of mZVI but also improve its remediation efficiency for TCE, the three biopolymers xanthan gum (XG), guargum (GG), and carboxymethyl cellulose (CMC) were employed to coat mZVI for surface modification. The suspension stability of the modified mZVI and its TCE removal efficiency were systematically investigated. The result indicated that XG as a shear-thinning fluid showed the most remarkable efficiency of preventing mZVI from gravity sedimentation and enhancing the TCE removal efficiency by mZVI. In a 480-h experiment, the presence of XG (3 g L(-1)) increased the TCE removal efficiency by 31.85 %, whereas GG (3 g L(-1)) and CMC (3 g L(-1)) merely increased by 15.61 and 9.69 % respectively. The pH value, Eh value, and concentration of ferrous ion as functions of the reaction time were recorded in all the reaction systems, which indicated that XG worked best in buffering the pH value of the solution and inhibiting surface passivation of mZVI.
ISSN	09441344
Issue Number	14
Journal	Environmental Science and Pollution Research
Volume Number	23
e-ISSN	16147499
Language	English
Publisher	Springer
Publisher Date	2016-07-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Environmental Science Discipline Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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