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Effects of contact time and flow configuration on the acid mine drainage remediation capabilities of pervious concrete

Thisani, SK, Von Kallon, DV and Byrne, PA (2021) Effects of contact time and flow configuration on the acid mine drainage remediation capabilities of pervious concrete. Sustainability, 13 (19). ISSN 2071-1050

Effects of Contact Time and Flow Configuration on the Acid Mine Drainage Remediation Capabilities of Pervious Concrete.pdf - Published Version
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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.

Item Type: Article
Uncontrolled Keywords: 12 Built Environment and Design
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
T Technology > TN Mining engineering. Metallurgy
Divisions: Biological & Environmental Sciences (new Sep 19)
Publisher: MDPI
Date Deposited: 01 Oct 2021 09:34
Last Modified: 01 Oct 2021 09:45
DOI or Identification number: 10.3390/su131910847
URI: https://researchonline.ljmu.ac.uk/id/eprint/15585

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