Suloshini, S, Ranathunga, AS orcid.org/0000-0001-8746-5326, Kulathilaka, SAS et al. (2 more authors) (2021) Utilization of Bottom Ash for Clay Mine Rehabilitation. In: Dissanayake, R, Mendis, P, Weerasekera, K, De Silva, S and Fernando, S, (eds.) ICSBE 2020: Proceedings of the 11th International Conference on Sustainable Built Environment. 11th International Conference on Sustainable Built Environment, 10-12 Dec 2020, Kandy, Sri Lanka. Lecture Notes in Civil Engineering, 174 . Springer , pp. 101-112. ISBN 9789811644115
Abstract
At the end of mining activities, clay mines were abandoned due to the cost and non-availability of filling materials. These abandoned clay mines cause adverse environmental and social impacts. In addition, large quantities of bottom ash (BA) are generated as a by-product of coal combustion process. This BA is disposed by open dumping in the lands, which creates severe environmental pollution. Therefore, conducted research on utilization of BA for mine rehabilitation is beneficial. The main focus of this research is applicability of BA generated from Lakvijaya power plant, Sri Lanka as a potential backfill material and a soil amendment during the clay mine rehabilitation. Initially tests were conducted to investigate the basic properties of BA. Next, chemical composition of BA was analysed to select the suitable crops for vegetation. Further pH, electrical conductivity and water holding capacity were checked and micro structural morphology of BA was determined through Scanning Electron Microscope. The results showed that BA has good engineering properties and the potential to improve agronomic characteristics of soil. It has better water holding capacity and permeability. BA can adjust soil pH to a desirable plant growth range. As BA has a very porous structure, the root system can easily develop and helps to uptake nutrients by the plant. However, a considerable percentage of trace metals is accumulated in BA which will increase the bioavailability of some trace metals to levels that poses risk to human. Thus, investigations were carried out to identify the heavy metal concentration in leachate of BA using column leaching test. Results showed that leachability potential of trace metals in BA does not exceed the allowable limits.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Editors: |
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Copyright, Publisher and Additional Information: | © The Author(s). This is an author produced version of a conference paper published in ICSBE 2020. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Bottom ash; Clay mines; Compaction; Soil amendment; Trace metals |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 19 Jun 2023 09:28 |
Last Modified: | 29 Jun 2023 10:22 |
Status: | Published |
Publisher: | Springer |
Series Name: | Lecture Notes in Civil Engineering |
Identification Number: | 10.1007/978-981-16-4412-2_9 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:199818 |