AustralieFrV1, Main, Exploration, bibRecord, 00A449

Sequential reactive barrier remediation of ammonium-contaminated groundwater using polymer mats

Identifieur interne : 00A449 ( Main/Exploration ); précédent : 00A448; suivant : 00A450

Sequential reactive barrier remediation of ammonium-contaminated groundwater using polymer mats

Auteurs : Bradley M. Patterson [Australie] ; Michelle E. Grassi [Australie] ; Blair Robertson [Australie] ; Gregory B. Davis [Australie] ; Allan J. Mckinley [Australie]

Source :

IAHS-AISH publication [ 0144-7815 ] ; 2005.

RBID : Pascal:05-0414714

Descripteurs français

Pascal (Inist)
- Remédiation, Ammonium, Eau souterraine, Aquifère, Polymère, Etude expérimentale, In situ, Biotraitement, Oxygène, Diffusion, Nitrite, Nitrate, Dénitrification, Azote, Solubilité, Interface, Pollution, Contamination, Barrière déchet, Instrumentation, Barrière réactive.
Wicri :
- topic : Eau souterraine, Polymère, Oxygène, Azote, Pollution.

English descriptors

KwdEn :
- ammonium, aquifers, bioremediation, contamination, denitrification, diffusion, disposal barriers, experimental studies, ground water, in situ, instruments, interfaces, nitrates, nitrites, nitrogen, oxygen, pollution, polymers, remediation, solubility.

Abstract

Large-scale column experiments and a pilot-scale field trial were undertaken to evaluate the potential of in situ polymer mats (installed in series) as permeable reactive barriers within a "treatment wall" remediation system to induce sequential bioremediation of ammonium-contaminated groundwater. The first upgradient polymer mat was used to deliver oxygen via diffusion to induce bacterial nitrification of the ammonium to nitrite/nitrate as the groundwater moved past, and the downgradient polymer mat was used to deliver ethanol, to induce bacterial denitrification of the nitrite/nitrate to produce nitrogen gas. In these large-scale column experiments, nitrification rates increased and stabilized over the six-month experiment, with stable nitrification half-lives in the range 0.06-0.25 days. Based on the mass of ammonium converted and oxygen aqueous solubility data, nitrification most likely occurred in a biologically active zone at the polymer wall/aqueous interface. When ethanol was delivered via the downgradient polymer mat, denitrification half-lives in the range 0.12-0.34 days were observed. Nitrification/ denitrification rates were maintained for groundwater flow rates up to 300 m year^-1, suggesting oxygen and ethanol delivery rates via the polymer mats were sufficient not to limit nitrification or denitrification. In the pilot-scale field trial, a 7-m deep treatment wall was constructed with 10-m wide impermeable wings either side of a 0.75-m wide permeable reactive zone "flow-through box" containing an oxygen and an ethanol delivery polymer mat. Sequential remediation of ammonium was observed with a >90% reduction in total N. The location and rate of nitrification (half-life of 1.2 days) suggested nitrification may not have occurred at a discrete biologically active zone. An average denitrification half-life of 0.4 days was similar to laboratory column results.

Affiliations:

Australie

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Le document en format XML

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>ammonium</term>
<term>aquifers</term>
<term>bioremediation</term>
<term>contamination</term>
<term>denitrification</term>
<term>diffusion</term>
<term>disposal barriers</term>
<term>experimental studies</term>
<term>ground water</term>
<term>in situ</term>
<term>instruments</term>
<term>interfaces</term>
<term>nitrates</term>
<term>nitrites</term>
<term>nitrogen</term>
<term>oxygen</term>
<term>pollution</term>
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<term>remediation</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Remédiation</term>
<term>Ammonium</term>
<term>Eau souterraine</term>
<term>Aquifère</term>
<term>Polymère</term>
<term>Etude expérimentale</term>
<term>In situ</term>
<term>Biotraitement</term>
<term>Oxygène</term>
<term>Diffusion</term>
<term>Nitrite</term>
<term>Nitrate</term>
<term>Dénitrification</term>
<term>Azote</term>
<term>Solubilité</term>
<term>Interface</term>
<term>Pollution</term>
<term>Contamination</term>
<term>Barrière déchet</term>
<term>Instrumentation</term>
<term>Barrière réactive</term>
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<term>Polymère</term>
<term>Oxygène</term>
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<front><div type="abstract" xml:lang="en">Large-scale column experiments and a pilot-scale field trial were undertaken to evaluate the potential of in situ polymer mats (installed in series) as permeable reactive barriers within a "treatment wall" remediation system to induce sequential bioremediation of ammonium-contaminated groundwater. The first upgradient polymer mat was used to deliver oxygen via diffusion to induce bacterial nitrification of the ammonium to nitrite/nitrate as the groundwater moved past, and the downgradient polymer mat was used to deliver ethanol, to induce bacterial denitrification of the nitrite/nitrate to produce nitrogen gas. In these large-scale column experiments, nitrification rates increased and stabilized over the six-month experiment, with stable nitrification half-lives in the range 0.06-0.25 days. Based on the mass of ammonium converted and oxygen aqueous solubility data, nitrification most likely occurred in a biologically active zone at the polymer wall/aqueous interface. When ethanol was delivered via the downgradient polymer mat, denitrification half-lives in the range 0.12-0.34 days were observed. Nitrification/ denitrification rates were maintained for groundwater flow rates up to 300 m year<sup>-1</sup>
, suggesting oxygen and ethanol delivery rates via the polymer mats were sufficient not to limit nitrification or denitrification. In the pilot-scale field trial, a 7-m deep treatment wall was constructed with 10-m wide impermeable wings either side of a 0.75-m wide permeable reactive zone "flow-through box" containing an oxygen and an ethanol delivery polymer mat. Sequential remediation of ammonium was observed with a >90% reduction in total N. The location and rate of nitrification (half-life of 1.2 days) suggested nitrification may not have occurred at a discrete biologically active zone. An average denitrification half-life of 0.4 days was similar to laboratory column results.</div>
</front>
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<tree><country name="Australie"><noRegion><name sortKey="Patterson, Bradley M" sort="Patterson, Bradley M" uniqKey="Patterson B" first="Bradley M." last="Patterson">Bradley M. Patterson</name>
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<name sortKey="Davis, Gregory B" sort="Davis, Gregory B" uniqKey="Davis G" first="Gregory B." last="Davis">Gregory B. Davis</name>
<name sortKey="Grassi, Michelle E" sort="Grassi, Michelle E" uniqKey="Grassi M" first="Michelle E." last="Grassi">Michelle E. Grassi</name>
<name sortKey="Grassi, Michelle E" sort="Grassi, Michelle E" uniqKey="Grassi M" first="Michelle E." last="Grassi">Michelle E. Grassi</name>
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Sequential reactive barrier remediation of ammonium-contaminated groundwater using polymer mats

Sequential reactive barrier remediation of ammonium-contaminated groundwater using polymer mats

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri