Combined abiotic and biotic in-situ reduction of hexavalent chromium in groundwater using nZVI and whey: A remedial pilot test

0455606 - MBÚ 2016 RIV NL eng J - Journal Article
Němeček, J. - Pokorný, P. - Lacinová, L. - Černík, M. - Masopustová, Z. - Lhotský, O. - Filipová, Alena - Cajthaml, Tomáš
Combined abiotic and biotic in-situ reduction of hexavalent chromium in groundwater using nZVI and whey: A remedial pilot test.
Journal of Hazardous Materials. Roč. 300, DEC 2015 (2015), s. 670-679. ISSN 0304-3894. E-ISSN 1873-3336
R&D Projects: GA TA ČR TE01020218
Grant - others:Advanced Technologies and Innovation(CZ) CZ.1.05/2.1.00/01.0005
Institutional support: RVO:61388971
Keywords : Hexavalent chromium * nZVI * Geofixation
Subject RIV: EE - Microbiology, Virology
Impact factor: 4.836, year: 2015

The paper describes a pilot remediation test combining two Cr(VI) geofixation methods - chemical reduction by nanoscale zero-valent iron (nZVI) and subsequent biotic reduction supported by whey. Combination of the methods exploited the advantages of both - a rapid decrease in Cr(VI) concentrations by nZVI, which prevented further spreading of the contamination and facilitated subsequent use of the cheaper biological method. Successive application of whey as an organic substrate to promote biotic reduction of Cr(VI) after application of nZVI resulted in a further and long-term decrease in the Cr(VI) contents in the groundwater. The effect of biotic reduction was observed even in a monitoring well located at a distance of 22 m from the substrate injection wells after 10 months. The results indicated a reciprocal effect of both the phases - nZVI oxidized to Fe(III) during the abiotic phase was microbially reduced back to Fe(II) and acted as a reducing agent for Cr(VI) even when the microbial density was already low due to the consumed substrate.
Permanent Link: http://hdl.handle.net/11104/0256195