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Beneficiation of wastewater streams from gold mine process water systems with recovery of value-adding liquid waste products
Dissertation (MEng)--University of Pretoria, 2013.
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University of Pretoria
2013
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| _version_ | 1867613465147867136 |
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| access_status_str | Open Access |
| author2 | Chirwa, Evans M.N. |
| author_browse | Chirwa, Evans M.N. |
| author_facet | Chirwa, Evans M.N. |
| collection | Thesis |
| dc_rights_str_mv | © 2012, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria |
| description | Dissertation (MEng)--University of Pretoria, 2013. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/29883 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:36:34.553Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/29883 Beneficiation of wastewater streams from gold mine process water systems with recovery of value-adding liquid waste products Chirwa, Evans M.N. lelanie.bester@goldfields.co.za Bester, Lelanie Weak acid cationic resins Strong acid cationic resins Ion exchange Liquid fertilizers Recovery system optimization Crystalactor Wastewater beneficiation UCTD Dissertation (MEng)--University of Pretoria, 2013. A strategy for beneficiation of wastewater streams from fissure and process water developed for a gold mine operation in the west of Johannesburg was tested for viability in a pilot study. The investigation was aimed at evaluating the compliance of the finally discharged effluent streams with the current Water Use Licence (WUL). The core of the water recovery process consisted of softening to remove divalent cationic species, followed by ion exchange processes employing Strong Acid Cationic (SAC) resins and Weak Acid Cationic (WAC) resins. An operational design limitation was that the crystalactor used in the softening stage had a minimum capacity of 20 000 L/h, whereas the rest of the system could be operated at flow rates of as low as 2 000 L/h. For this reason, the softening step was done in semi-batch mode. Calcium hardness was decreased from 70 mg/L to values lower than 40 mg/L (as Ca2+). During the ion exchange (water recovery) process, columns using SAC resin produced better quality water than the WAC resins. The SAC columns produced water compatible with South African Water Quality Standards. Additionally, the use of SAC proved to be a more financially favourable option, since the regenerant stream contained high concentrations of calcium nitrate, magnesium nitrate and sodium nitrate fertilizer. The latter could be sold as a liquid fertilizer to farmers. In addition to the above findings, the pilot system reduced the concentration of toxic and radiotoxic metals such as uranium. The final concentration of the uranium in the effluent (0.01 mg/L) was below the regulation limit 0.07 mg/L. The selective removal of uranium is crucial in order to produce high-quality fertilizer from the ion exchange regeneration streams. Copyright Chemical Engineering unrestricted 2013-09-07T17:04:51Z 2013-01-09 2013-09-07T17:04:51Z 2012-09-06 2013-01-09 2012-11-27 Dissertation Bester, L 2012, Beneficiation of wastewater streams from gold mine process water systems with recovery of value-adding liquid waste products, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/29883 > E12/9/254/gm http://hdl.handle.net/2263/29883 http://upetd.up.ac.za/thesis/available/etd-11272012-183749/ © 2012, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria application/pdf University of Pretoria |
| spellingShingle | Weak acid cationic resins Strong acid cationic resins Ion exchange Liquid fertilizers Recovery system optimization Crystalactor Wastewater beneficiation UCTD Beneficiation of wastewater streams from gold mine process water systems with recovery of value-adding liquid waste products |
| title | Beneficiation of wastewater streams from gold mine process water systems with recovery of value-adding liquid waste products |
| title_full | Beneficiation of wastewater streams from gold mine process water systems with recovery of value-adding liquid waste products |
| title_fullStr | Beneficiation of wastewater streams from gold mine process water systems with recovery of value-adding liquid waste products |
| title_full_unstemmed | Beneficiation of wastewater streams from gold mine process water systems with recovery of value-adding liquid waste products |
| title_short | Beneficiation of wastewater streams from gold mine process water systems with recovery of value-adding liquid waste products |
| title_sort | beneficiation of wastewater streams from gold mine process water systems with recovery of value adding liquid waste products |
| topic | Weak acid cationic resins Strong acid cationic resins Ion exchange Liquid fertilizers Recovery system optimization Crystalactor Wastewater beneficiation UCTD |
| url | http://hdl.handle.net/2263/29883 http://upetd.up.ac.za/thesis/available/etd-11272012-183749/ |