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The In Situ Bioremediation of an In Situ Recovery Mining Site for the Reduction/Immobilization of Uranium Utilizing Gaseous Hydrogen.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The In Situ Bioremediation of an In Situ Recovery Mining Site for the Reduction/Immobilization of Uranium Utilizing Gaseous Hydrogen./
作者:	Haynes, Lewis Lester, IV.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	120 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-03, Section: B.
Contained By:	Dissertations Abstracts International83-03B.
標題:	Environmental engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28715787
ISBN:	9798538123568

The In Situ Bioremediation of an In Situ Recovery Mining Site for the Reduction/Immobilization of Uranium Utilizing Gaseous Hydrogen.
Haynes, Lewis Lester, IV.

The In Situ Bioremediation of an In Situ Recovery Mining Site for the Reduction/Immobilization of Uranium Utilizing Gaseous Hydrogen. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 120 p.

Source: Dissertations Abstracts International, Volume: 83-03, Section: B.

Thesis (Ph.D.)--Texas A&M University - Kingsville, 2021.

This item must not be sold to any third party vendors.

The most common method currently used for restoring groundwater at in-situ recovery (ISR) uranium mining sites is reverse osmosis (RO) and reinjection of the permeate. However, this practice does not restore the formation to its original reduced state, and in many cases groundwater uranium concentrations are not restored to pre-mining baseline levels. This study was performed to evaluate the effectiveness of introducing dissolved hydrogen into a post-mined formation at an ISR mining site to stimulate the chemical reduction and immobilization of residual soluble uranium. The main objectives of this research project were: 1) to develop and optimize a system for minimizing air entrainment during water injection when employing a membrane gas-transfer device for down-hole hydrogen infusion; 2) to assess whether injecting dissolved hydrogen using the membrane gas-transfer device can promote immobilization of dissolved uranium in groundwater to near or below pre-mining concentrations; and 3) to model the extent to which the presence of solid-phase ferric iron in the formation would consume reducing equivalents and adversely affect the radial transport of hydrogen into the formation. Approximately 30,000 gallons of groundwater were pumped to the surface and then re-injected into the subsurface while being supplied with dissolved hydrogen using the down-hole membrane gas infusion device. The groundwater was pumped back to the surface after a month to evaluate the extent to which dissolved uranium had been removed. Results indicated an approximately 86% reduction in soluble uranium concentration was achieved and sustained for one year. Microbial analyses indicated a significant increase in iron-reducing bacteria, but less significant increases in sulfate-reducing bacteria. A bromide tracer study was performed concurrently with the hydrogen injection study so that the effective zone of influence of the push-pull test could be estimated, while pump tests were performed before and after the hydrogen injection study so the effect of the injected hydrogen on the formation permeability could also be assessed. An additional hydrogen injection showed limited additional results and a decrease in hydraulic conductivity. Finally, geochemical and hydraulic modeling was conducted to predict the zone of influence surrounding the injection well, the redox potential of the groundwater within the zone of influence, and the potential longevity of this remediation treatment process to give a more comprehensive picture of its effectiveness.

ISBN: 9798538123568Subjects--Topical Terms:

548583
Environmental engineering.
Subjects--Index Terms:

Dissolved hydropen

The In Situ Bioremediation of an In Situ Recovery Mining Site for the Reduction/Immobilization of Uranium Utilizing Gaseous Hydrogen.
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245 1 4 $a The In Situ Bioremediation of an In Situ Recovery Mining Site for the Reduction/Immobilization of Uranium Utilizing Gaseous Hydrogen.
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300 $a 120 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-03, Section: B.
500 $a Advisor: Clapp, Lee.
502 $a Thesis (Ph.D.)--Texas A&M University - Kingsville, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a The most common method currently used for restoring groundwater at in-situ recovery (ISR) uranium mining sites is reverse osmosis (RO) and reinjection of the permeate. However, this practice does not restore the formation to its original reduced state, and in many cases groundwater uranium concentrations are not restored to pre-mining baseline levels. This study was performed to evaluate the effectiveness of introducing dissolved hydrogen into a post-mined formation at an ISR mining site to stimulate the chemical reduction and immobilization of residual soluble uranium. The main objectives of this research project were: 1) to develop and optimize a system for minimizing air entrainment during water injection when employing a membrane gas-transfer device for down-hole hydrogen infusion; 2) to assess whether injecting dissolved hydrogen using the membrane gas-transfer device can promote immobilization of dissolved uranium in groundwater to near or below pre-mining concentrations; and 3) to model the extent to which the presence of solid-phase ferric iron in the formation would consume reducing equivalents and adversely affect the radial transport of hydrogen into the formation. Approximately 30,000 gallons of groundwater were pumped to the surface and then re-injected into the subsurface while being supplied with dissolved hydrogen using the down-hole membrane gas infusion device. The groundwater was pumped back to the surface after a month to evaluate the extent to which dissolved uranium had been removed. Results indicated an approximately 86% reduction in soluble uranium concentration was achieved and sustained for one year. Microbial analyses indicated a significant increase in iron-reducing bacteria, but less significant increases in sulfate-reducing bacteria. A bromide tracer study was performed concurrently with the hydrogen injection study so that the effective zone of influence of the push-pull test could be estimated, while pump tests were performed before and after the hydrogen injection study so the effect of the injected hydrogen on the formation permeability could also be assessed. An additional hydrogen injection showed limited additional results and a decrease in hydraulic conductivity. Finally, geochemical and hydraulic modeling was conducted to predict the zone of influence surrounding the injection well, the redox potential of the groundwater within the zone of influence, and the potential longevity of this remediation treatment process to give a more comprehensive picture of its effectiveness.
590 $a School code: 1187.
650 4 $a Environmental engineering. $3 548583
650 4 $a Environmental geology. $3 535218
650 4 $a Metals. $3 601053
650 4 $a Bioremediation. $3 677632
650 4 $a Bacteria. $3 550366
650 4 $a Dissertations & theses. $3 3560115
650 4 $a Hydrogen. $3 580023
650 4 $a Sulfur. $3 1027219
650 4 $a Environmental impact. $3 3564810
650 4 $a Metabolism. $3 541349
650 4 $a Objectives. $3 3561496
650 4 $a Aquifers. $3 551140
650 4 $a Field study. $3 3546147
650 4 $a Oxidation. $3 714629
650 4 $a Hypotheses. $3 3560118
650 4 $a Groundwater. $3 566494
650 4 $a Uranium. $3 832831
650 4 $a Experiments. $3 525909
650 4 $a Carbon. $3 604057
650 4 $a Methods. $3 3560391
650 4 $a Hydraulics. $3 669758
650 4 $a Geochemistry. $3 539092
650 4 $a Mining. $3 3544442
650 4 $a Bioengineering. $3 657580
653 $a Dissolved hydropen
653 $a Post-mined formation
653 $a Immobilization and reduction
653 $a Residual soluble uranium
690 $a 0775
690 $a 0407
690 $a 0551
690 $a 0202
690 $a 0996
710 2 $a Texas A&M University - Kingsville. $b Environmental Engineering. $3 2097677
773 0 $t Dissertations Abstracts International $g 83-03B.
790 $a 1187
791 $a Ph.D.
792 $a 2021
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28715787