Title
Impact of microbial activities on the mineralogy and performance of column-scale permeable reactive iron barriers operated under two different redox conditions Impact of microbial activities on the mineralogy and performance of column-scale permeable reactive iron barriers operated under two different redox conditions
Author
Faculty/Department
Faculty of Applied Engineering Sciences
Publication type
article
Publication
Easton, Pa ,
Subject
Engineering sciences. Technology
Source (journal)
Environmental science and technology / American Chemical Society. - Easton, Pa
Volume/pages
41(2007) :16 , p. 5724-5730
ISSN
0013-936X
ISI
000248886000027
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
The present study focuses on the impact of microbial activities on the performance of various long-term operated laboratory-scale permeable reactive barriers. The barriers contained both aquifer and Fe0 compartments and had received either sulfate or iron(III)-EDTA to promote sulfatereducing and iron(III)-reducing bacteria, respectively. After dismantlement of the compartments after almost 3 years of operation, DNA-based PCR-DGGE analysis revealed the presence of methanogenic, sulfate-reducing, metalreducing, and denitrifying bacteria within as well as up- and downgradient of the Fe0 matrix. Under all imposed conditions, the main secondary phases were vivianite, siderite, ferrous hydroxy carbonate, and carbonate green rust as found by scanning electron microscopy (SEM) combined with energy dispersive X-ray analysis (EDX), and X-ray diffraction (XRD). Under sulfate-reduction promoting conditions, iron sulfides were formed in addition, resulting in 7 and 10 times higher degradation rates for PCE and TCE, respectively, compared to unreacted iron. These results indicate that the presence of sulfate-reducing bacteria in or around iron barriers and the subsequent formation of iron sulfides might increase the barrier reactivity.
E-info
https://repository.uantwerpen.be/docman/iruaauth/ab5a1f/48fdab59db6.pdf
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