Hexahydro-1,3,5-trinitro-1,3,5-triazine mineralization by zerovalent iron and mixed anaerobic cultures

B T Oh; C L Just; P J Alvarez

doi:10.1021/es010852e

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Hexahydro-1,3,5-trinitro-1,3,5-triazine mineralization by zerovalent iron and mixed anaerobic cultures

Journal article

Peer reviewed

Hexahydro-1,3,5-trinitro-1,3,5-triazine mineralization by zerovalent iron and mixed anaerobic cultures

B T Oh, C L Just and P J Alvarez

Environmental science & technology, Vol.35(21), pp.4341-4346

11/01/2001

DOI: 10.1021/es010852e

PMID: 11718353

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Abstract

Soil microcosms were used to evaluate the potential benefits of an integrated microbial-Fe0 system to treat groundwater contamination by RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine). Microcosms amended with both Fe0 filings and municipal anaerobic sludge mineralized RDX faster and to a greater extent than separate treatments, with up to 51% 14CO2 recovery after 77 d. The nitroso byproducts 1,3-dinitro-5-nitroso-1,3,5-triazacyclohexane (MNX), 1,3-dinitroso-5-nitro-1,3,5-triazacyclohexane (DNX), and 1,3,5-trinitroso-1,3,5-triazacyclohexane (TNX) were detected in all microcosms, although these compounds never accumulated above 5% of the added RDX on a molar basis. A soluble intermediate that was tentatively identified as methylenedinitramine [(O2NNH)2CH2] was relatively persistent, although it accumulated to a much lower extent in combined-treatment reactors than in sets with Fe0 or sludge alone. Some of the radiolabel was bound to soil and Fe0 and could not be extracted with CH3CN. This fraction, which was recovered by combustion with a biological oxidizer, was also found at lower concentrations in combined-treatment reactors. This work suggests that permeable reactive Fe0 barriers might be an effective approach to intercept and degrade RDX plumes and that treatment efficiency might be enhanced by biogeochemical interactions through bioaugmentation.

Anaerobiosis

Triazines - metabolism

Carbon Dioxide - metabolism

Soil Microbiology

Sewage - analysis

Models, Molecular

Fresh Water - chemistry

Soil - analysis

Water Pollutants, Chemical - analysis

Biodegradation, Environmental - drug effects

Drug Synergism

Nitroso Compounds - metabolism

Ferrous Compounds - metabolism

Fresh Water - analysis

Minerals - metabolism

Iron - pharmacology

Water Pollution - analysis

Water Purification - methods

Details

Title: Subtitle: Hexahydro-1,3,5-trinitro-1,3,5-triazine mineralization by zerovalent iron and mixed anaerobic cultures
Creators: B T Oh - Department of Civil and Environmental Engineering, The University of Iowa, Iowa City 52242-1527, USA
C L Just
P J Alvarez
Resource Type: Journal article
Publication Details: Environmental science & technology, Vol.35(21), pp.4341-4346
Publisher: United States
DOI: 10.1021/es010852e
PMID: 11718353
ISSN: 0013-936X
eISSN: 1520-5851
Language: English
Date published: 11/01/2001
Academic Unit: Civil and Environmental Engineering
Record Identifier: 9983992090102771

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