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Experimental Investigation of Microbially Induced Carbonate Precipitation on Fine Mineral Tailings.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Experimental Investigation of Microbially Induced Carbonate Precipitation on Fine Mineral Tailings./
作者:	Liu, Qianwen.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	177 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-05, Section: B.
Contained By:	Dissertations Abstracts International83-05B.
標題:	By products. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28814845
ISBN:	9798494454973

Experimental Investigation of Microbially Induced Carbonate Precipitation on Fine Mineral Tailings.
Liu, Qianwen.

Experimental Investigation of Microbially Induced Carbonate Precipitation on Fine Mineral Tailings. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 177 p.

Source: Dissertations Abstracts International, Volume: 83-05, Section: B.

Thesis (Ph.D.)--North Carolina State University, 2021.

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

Microbially induced carbonate precipitation (MICP) is a sustainable biological ground improvement technique that provides cohesive bonds between soil particles through microbial metabolism. Most MICP applications were applied on sands or silty sands, which showed that calcium carbonate precipitation improved the strength and stiffness of the soil matrix. However, the use of MICP on fine-grained materials is quite limited. Currently, augmented-MICP (bioaugmentation) and stimulated-MICP (bio-stimulation) are used for MICP application generally. In addition to ureolysis, alternative bio-mediated processes such as denitrification, iron reduction, and sulfate reduction were used or proposed for MICP. Oil sands fine tailings (FT) are the by-products of oil sands extraction. By using the water-based extraction method, bitumen is extracted from oil sands, and in return large quantities of FTs are produced. FT was deposited into tailings ponds as a form of fluid fine tailings (FFT) that contains sands, fines, water, and residual bitumen. With the settlement of the coarse materials in FFT, the FT forms as mature fine tailings (MFT) that is a stable suspension with solids content more than 30%. MFTs need decades or even a hundred years to reach an appropriate strength and solid content for terrestrial reclamation because of the extremely low strength and highly dispersed fabric. Although many treatment methods were applied to MFT, an alternative method is still needed to shorten the reclamation of the tailings ponds. This study mainly investigated the application of MICP on mature fine tailings (MFT). Both augmented-MICP and stimulated-MICP were used to accelerate the flocculating process and increase the strength of MICP treated MFT.For the augmented-MICP approach, the self-weight consolidation column test and largestrain consolidation test were used to evaluate the performance and mechanisms of the MICP treated tailings. The self-weight consolidation column test results presented that the MICP treated accelerated the flocculation process of the treated tailings via decreasing the diffuse double layer thickness and bonding soil particles by precipitation. And the large-strain consolidation test indicated that the MICP-treated specimens maintained a higher permeability compared to untreated MFT and MFT treated by other treatment methods. And because of the precipitation, the soil-to-soil connections were built earlier than the chemically induced consolidation (Chem) treated specimens. Also, the precipitation strengthened the soil skeleton of MFT, which reduced the maximum excess pore water pressure.For a stimulated-MICP approach, ureolysis and sulfate reduction metabolism were evaluated. Culturing factors for the bio-stimulation process included air availability, initial solution pH, and methanogens inhibitor. To evaluate the performance of the treatments, physicochemical characteristics estimation, mineral identification, macro and fabric observation, and microbiome analysis were used. The results of the urea-based stimulated-MICP treated MFT demonstrated that air and neutral initial pH promoted the indigenous microorganisms such as Bacillus jeotgali to produce precipitation and densify the fabric of MFT. For the sulfate reduction driven MICP, an increase of precipitation and decrease of sulfate and lactate were observed at the end of incubation showing the stimulation of sulfate-reducing bacteria (SRB) in MFT. The stimulation of SRB was inhibited by the high initial pH of the sulfate-based medium. Further tests evaluating the effects of the sulfate reduction driven MICP on MFT are needed.Lastly, to facilitate field applications, an upscaling inoculation method of Sporosarcina pasteurii was developed and evaluated for its efficacy.

ISBN: 9798494454973Subjects--Topical Terms:

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Experimental Investigation of Microbially Induced Carbonate Precipitation on Fine Mineral Tailings.
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245 1 0 $a Experimental Investigation of Microbially Induced Carbonate Precipitation on Fine Mineral Tailings.
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300 $a 177 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-05, Section: B.
500 $a Advisor: Montoya, Brina.
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506 $a This item must not be sold to any third party vendors.
520 $a Microbially induced carbonate precipitation (MICP) is a sustainable biological ground improvement technique that provides cohesive bonds between soil particles through microbial metabolism. Most MICP applications were applied on sands or silty sands, which showed that calcium carbonate precipitation improved the strength and stiffness of the soil matrix. However, the use of MICP on fine-grained materials is quite limited. Currently, augmented-MICP (bioaugmentation) and stimulated-MICP (bio-stimulation) are used for MICP application generally. In addition to ureolysis, alternative bio-mediated processes such as denitrification, iron reduction, and sulfate reduction were used or proposed for MICP. Oil sands fine tailings (FT) are the by-products of oil sands extraction. By using the water-based extraction method, bitumen is extracted from oil sands, and in return large quantities of FTs are produced. FT was deposited into tailings ponds as a form of fluid fine tailings (FFT) that contains sands, fines, water, and residual bitumen. With the settlement of the coarse materials in FFT, the FT forms as mature fine tailings (MFT) that is a stable suspension with solids content more than 30%. MFTs need decades or even a hundred years to reach an appropriate strength and solid content for terrestrial reclamation because of the extremely low strength and highly dispersed fabric. Although many treatment methods were applied to MFT, an alternative method is still needed to shorten the reclamation of the tailings ponds. This study mainly investigated the application of MICP on mature fine tailings (MFT). Both augmented-MICP and stimulated-MICP were used to accelerate the flocculating process and increase the strength of MICP treated MFT.For the augmented-MICP approach, the self-weight consolidation column test and largestrain consolidation test were used to evaluate the performance and mechanisms of the MICP treated tailings. The self-weight consolidation column test results presented that the MICP treated accelerated the flocculation process of the treated tailings via decreasing the diffuse double layer thickness and bonding soil particles by precipitation. And the large-strain consolidation test indicated that the MICP-treated specimens maintained a higher permeability compared to untreated MFT and MFT treated by other treatment methods. And because of the precipitation, the soil-to-soil connections were built earlier than the chemically induced consolidation (Chem) treated specimens. Also, the precipitation strengthened the soil skeleton of MFT, which reduced the maximum excess pore water pressure.For a stimulated-MICP approach, ureolysis and sulfate reduction metabolism were evaluated. Culturing factors for the bio-stimulation process included air availability, initial solution pH, and methanogens inhibitor. To evaluate the performance of the treatments, physicochemical characteristics estimation, mineral identification, macro and fabric observation, and microbiome analysis were used. The results of the urea-based stimulated-MICP treated MFT demonstrated that air and neutral initial pH promoted the indigenous microorganisms such as Bacillus jeotgali to produce precipitation and densify the fabric of MFT. For the sulfate reduction driven MICP, an increase of precipitation and decrease of sulfate and lactate were observed at the end of incubation showing the stimulation of sulfate-reducing bacteria (SRB) in MFT. The stimulation of SRB was inhibited by the high initial pH of the sulfate-based medium. Further tests evaluating the effects of the sulfate reduction driven MICP on MFT are needed.Lastly, to facilitate field applications, an upscaling inoculation method of Sporosarcina pasteurii was developed and evaluated for its efficacy.
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