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Effects of Contact Time and Flow Configuration on the Acid Mine Drainage Remediation Capabilities of Pervious Concrete

1
Department of Mechanical and Industrial Engineering Technology, University of Johannesburg, Johannebsurg 2006, South Africa
2
School of Biological and Environmental Sciences, Liverpool John Moores University, Liverpool L2 2QP, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Gujie Qian
Sustainability 2021, 13(19), 10847; https://doi.org/10.3390/su131910847
Received: 20 July 2021 / Revised: 19 September 2021 / Accepted: 20 September 2021 / Published: 29 September 2021
This paper investigates the Acid Mine Drainage (AMD) remediation capabilities of pozzolanic pervious concrete Permeable Reactive Barriers (PRBs) with a specific focus on the effects of flow configuration and contact time on the remediation efficiency. Raw AMD was collected from an abandoned coal mine. Two flow configurations, gravity flow and column flow, were tested at a laboratory scale with gradually increasing contact times. The gravity flow configuration with two orders of magnitude less liquid-concrete contact time achieved AMD treated water quality equivalent to the high retention column flow configuration. Concentrations of iron, aluminium, sulphate, magnesium and sodium were reduced by more than 99%, 80%, 17%, 22% and 20%, respectively, at the tested limits while calcium and potassium concentrations were increased by up to 16% and 300%, respectively. The study findings indicate that the lifecycle costs of pervious concrete PRBs can be significantly reduced when the PRBs are operated under gravity flow. View Full-Text
Keywords: Acid Mine Drainage; pervious concrete; Permeable Reactive Barrier; contact time; flow configuration Acid Mine Drainage; pervious concrete; Permeable Reactive Barrier; contact time; flow configuration
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MDPI and ACS Style

Thisani, S.K.; Kallon, D.V.V.; Byrne, P. Effects of Contact Time and Flow Configuration on the Acid Mine Drainage Remediation Capabilities of Pervious Concrete. Sustainability 2021, 13, 10847. https://doi.org/10.3390/su131910847

AMA Style

Thisani SK, Kallon DVV, Byrne P. Effects of Contact Time and Flow Configuration on the Acid Mine Drainage Remediation Capabilities of Pervious Concrete. Sustainability. 2021; 13(19):10847. https://doi.org/10.3390/su131910847

Chicago/Turabian Style

Thisani, Sandisiwe K., Daramy V.V. Kallon, and Patrick Byrne. 2021. "Effects of Contact Time and Flow Configuration on the Acid Mine Drainage Remediation Capabilities of Pervious Concrete" Sustainability 13, no. 19: 10847. https://doi.org/10.3390/su131910847

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