Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1007/s11356-016-6368-z
Volltext Shareable Link
Titel (primär) Remediation of trichloroethylene-contaminated groundwater by three modifier-coated microscale zero-valent iron
Autor Han, Y.; Xin, J.; Zheng, X.; Kolditz, O. ORCID logo ; Shao, H. ORCID logo
Quelle Environmental Science and Pollution Research
Erscheinungsjahr 2016
Department ENVINF
Band/Volume 23
Heft 14
Seite von 14442
Seite bis 14450
Sprache englisch
Keywords Microscale zero-valent iron (mZVI); Xanthan gum (XG); Guar gum (GG); Carboxymethyl cellulose (CMC); Trichloroethylene (TCE); Groundwater
UFZ Querschnittsthemen RU5;
Abstract

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.

dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=17707
Han, Y., Xin, J., Zheng, X., Kolditz, O., Shao, H. (2016):
Remediation of trichloroethylene-contaminated groundwater by three modifier-coated microscale zero-valent iron
Environ. Sci. Pollut. Res. 23 (14), 14442 - 14450 10.1007/s11356-016-6368-z