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Evaluation of coal fly ash for use i...

Yeheyis, Muluken B.

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Evaluation of coal fly ash for use in mine waste management.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Evaluation of coal fly ash for use in mine waste management./
Author:	Yeheyis, Muluken B.
Description:	212 p.
Notes:	Source: Dissertation Abstracts International, Volume: 69-11, Section: B, page: 7011.
Contained By:	Dissertation Abstracts International69-11B.
Subject:	Engineering, Civil. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR43105
ISBN:	9780494431054

Evaluation of coal fly ash for use in mine waste management.
Yeheyis, Muluken B.

Evaluation of coal fly ash for use in mine waste management. - 212 p.

Source: Dissertation Abstracts International, Volume: 69-11, Section: B, page: 7011.

Thesis (Ph.D.)--The University of Western Ontario (Canada), 2008.

This study investigates the utilization of alkaline coal fly ash as an alternative mine waste management strategy to control acid mine drainage (AMD). A series of laboratory experiments were carried out to identify suitable geotechnical and geoenvironmental properties of fresh and landfilled coal fly ash from Atikokan Thermal Generating Station (Atikokan TGS), Ontario that are required for use in mine waste management. Two possible schemes of coal ash utilization for mine waste management were also investigated: (i) as a barrier material to retard the migration of heavy metals and acidity into the surrounding environment, and (ii) as an additive to mine tailings to prevent AMD formation and metal release.

ISBN: 9780494431054Subjects--Topical Terms:

783781
Engineering, Civil.

Evaluation of coal fly ash for use in mine waste management.
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020 $a 9780494431054
035 $a (UMI)AAINR43105
035 $a AAINR43105
040 $a UMI $c UMI
100 1 $a Yeheyis, Muluken B. $3 1672638
245 1 0 $a Evaluation of coal fly ash for use in mine waste management.
300 $a 212 p.
500 $a Source: Dissertation Abstracts International, Volume: 69-11, Section: B, page: 7011.
502 $a Thesis (Ph.D.)--The University of Western Ontario (Canada), 2008.
520 $a This study investigates the utilization of alkaline coal fly ash as an alternative mine waste management strategy to control acid mine drainage (AMD). A series of laboratory experiments were carried out to identify suitable geotechnical and geoenvironmental properties of fresh and landfilled coal fly ash from Atikokan Thermal Generating Station (Atikokan TGS), Ontario that are required for use in mine waste management. Two possible schemes of coal ash utilization for mine waste management were also investigated: (i) as a barrier material to retard the migration of heavy metals and acidity into the surrounding environment, and (ii) as an additive to mine tailings to prevent AMD formation and metal release.
520 $a The feasibility of using coal fly ash and bentonite-fly ash mixtures as a barrier material for mine waste was investigated using a constant flow fixed-ring permeameter. The measured hydraulic conductivity of the coal fly ash was of the order of 2 x 10-9 m/s when the fly ash was permeated with deionized water, and significantly decreased when the permeant was switched to AMD. Addition of bentonite to the coal fly ash lowered its hydraulic conductivity during water permeation but no further significant change was observed upon switching the permeant to AMD. Chemical analysis of the effluent from the hydraulic conductivity tests indicated that heavy metals present in AMD were attenuated and were well below the leachate criteria set by the Ontario Government.
520 $a This study also evaluated the efficiency of coal fly ash addition to reactive mine tailings to control the AMD formation and subsequent heavy metal mobilization. Atikokan coal fly ash and Musselwhite mine tailings were mixed at different proportions and the drainage chemistry and the optimal mix was investigated using static (acid base accounting (ABA)) and kinetic (column) testings. The ABA results indicated that fly ash possessed strong alkaline (neutralization) potential and could be used in the management of reactive mine tailings, thus ensuring prevention of AMD in the long term. Column tests conducted in the laboratory to further investigate the long-term performance of fly ash in the neutralization and mitigation of AMD from tailings similarly showed that mixing fly ash with mine tailings reduces dissolution of heavy metals by providing alkalinity to the system.
520 $a Keywords. coal fly ash; mine waste; acid mine drainage; acid base accounting; acid neutralization capacity, sorption capacity; hydraulic conductivity; saturation index.
590 $a School code: 0784.
650 4 $a Engineering, Civil. $3 783781
650 4 $a Engineering, Mining. $3 1035560
650 4 $a Engineering, Environmental. $3 783782
690 $a 0543
690 $a 0551
690 $a 0775
710 2 $a The University of Western Ontario (Canada). $3 1017622
773 0 $t Dissertation Abstracts International $g 69-11B.
790 $a 0784
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR43105