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Treatment of mine water for the fast removal of zinc and lead by wood ash amended biochar
,
Patrick Byrne,
Tom Dunlop
Environmental Science: Advances, Volume: 1, Pages: 506 - 516
Swansea University Authors:
Stuart Cairns, STUART CAIRNS, Iain Robertson , Tom Dunlop
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DOI (Published version): 10.1039/d2va00085g
Abstract
Lead and zinc mines are a primary source of environmental (post)-transition metal contamination resulting in major water pollution. In this study, the use of biochar amended with wood ash (WAS) was evaluated as a method to remediate zinc and lead contaminated mine water. Water from Nantymwyn lead mi...
| Published in: | Environmental Science: Advances |
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| ISSN: | 2754-7000 |
| Published: |
Royal Society of Chemistry (RSC)
2022
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa60891 |
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| Abstract: |
Lead and zinc mines are a primary source of environmental (post)-transition metal contamination resulting in major water pollution. In this study, the use of biochar amended with wood ash (WAS) was evaluated as a method to remediate zinc and lead contaminated mine water. Water from Nantymwyn lead mine, with zinc and lead concentrations as high as 12.1 mg L−1 and 1.7 mg L−1 respectively was used. The contact time for WAS to immobilise zinc and lead (1 min to 24 h), immobilisation mechanisms and maximum measured removal of lead and zinc were studied. FTIR spectroscopy and XPS was used to characterise WAS and the aqueous modelling program PHREEQC (pH redox equilibrium) was used to analyse mine water speciation. The fast removal performance of a biochar is a key indicator of its viability to be used as a green remediator. If the required contact time to remediate contaminated water is too long the sorbent becomes impractical. This study demonstrated that WAS removed 97% of zinc and 86% of lead within the first minute of contact with the mine water (0.5 g of WAS per 20 mL of mine water), with a maximum measured removal of 14.8 mg g−1 for zinc and 23.7 mg g−1 for lead (using 0.1–0.002 g of WAS per 40 mL of mine water). Fast removal was primarily a result of precipitation, and subsequent capture by WAS, and ion exchange. These findings show that WAS has the potential to be scaled up and deployed at mine sites to remediate contaminated water. |
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| Item Description: |
Erratum: Treatment of mine water for the fast removal of zinc and lead by wood ash amended biochar (Environmental Science: Advances (2022) 1 (506-516) DOI: 10.1039/d2va00085g)Environmental Science: Advances, Volume 1, Issue 5, Pages 862 - 863, 1 December 2022 |
| College: |
Faculty of Science and Engineering |
| Funders: |
Knowledge Economy Skills Scholarships (KESS) is a pan-Wales
higher level skills initiative led by Bangor University on behalf
of the HE sector in Wales. It is part funded by the Welsh
Government's European Social Fund (ESF) convergence programme for West Wales and the Valleys. This work is part
funded by the Welsh Government's European Social Fund (ESF)
convergence programme for West Wales and the Valleys. The
authors thank Richard Haine (Frog Environmental), Sion
Brackenbury (TerrAffix Soil Solutions), Peter Lanfear (TerrAffix
Soil Solutions) and Dr Ian Mabbett (Swansea University) for
their continued support. |
| Start Page: |
506 |
| End Page: |
516 |