Lockwood, APG, Kok Shun, P, Warren, NJ orcid.org/0000-0002-8298-1417 et al. (5 more authors) (2019) Dissolved Air Flotation for Rapid Dewatering and Separation of Legacy Sludge Wastes. In: Proceedings of the 2019 Waste Management Conference. Waste Management 2019, 03-07 Mar 2019, Phoenix Arizona. WM Symposia
Abstract
As a low footprint, high efficiency separation process, Dissolved Air Floatation (DAF) could effectively be retrofitted into existing waste management facilities at nuclear sites such Sellafield and Hanford to rapidly separate particulates from aqueous suspensions. The simplicity (no moving parts) and size of this technology coupled with low cost of construction and reagent purchase would also be ideal for ease of facility decommissioning with minimum impact to secondary waste generation. For this study, methyl isobutyl carbinol (MIBC) was used in this research as a frothing agent to produce a preferable stable foam. Mg(OH)2 was selected as a test material as it is the result of long term corrosion of Magnox fuel in UK nuclear fuel storage ponds. Due to the cationic nature of the Mg(OH)2 test material, the anionic surfactant, Sodium Dodecyl Sulphate (SDS) was used as collector to modify the surface properties to increase hydrophobicity. The performance of anionic SDS in floating 2.5%v/v Mg(OH)2 was compared to the adsorption isotherm of SDS on Mg(OH)2 to determine monolayer coverage surfactant dose which was investigated using Total Organic Carbon (TOC). SDS was found to increase particulate recovery to 93% with some water carry-over observed and it was found that particle bubble attachment was optimum for a select particle size distribution. This study proved that potential application of flotation as an efficient viable dewatering technique for common magnesium hydroxide based legacy wastes, using cheap, readily available collector and frother agents.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This is an author produced version of a paper published in the Proceedings of the 2019 Waste Management Conference. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 26 Mar 2019 10:52 |
Last Modified: | 25 Jun 2023 21:45 |
Published Version: | http://amz.xcdsystem.com/A464D2CF-E476-F46B-841E41... |
Status: | Published |
Publisher: | WM Symposia |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:143959 |