Conference Agenda

Overview and details of the sessions of this Conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

Please note that all times are shown in the time zone of the conference. The current conference time is: 17th Aug 2022, 06:12:09am BST

Session Overview
Passive Treatment & Mine Closure
Wednesday, 14/July/2021:
9:50am - 11:55am

Session Chair: Carl Banton
Location: Meeting Room 2

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9:50am - 10:15am
ID: 568 / S_5_2: 1
Full Paper - Oral Presentation
Topic: 2 Passive Treatment Innovation, Bio-Geochemical Systems, 5 Mine Water Treatment Systems
Way of Presentation: Pre-Recorded
Keywords: mine wastes, arsenic removal, bio-oxidation, field-pilot

🎓 Performances of a semi-passive field-pilot for bioremediation of As-rich Acid Mine Drainage at the Carnoulès mine (France)

Camila Diaz-Vanegas1,2, Corinne Casiot1, Liming Lin3, Laurent De Windt4, Adam Djibrine2,3, Amandine Malcles3, Marina Héry1, Angelique Desoeuvre1, Odile Bruneel1, Fabienne Battaglia-Brunet2, Jerome Jacob2

1HydroSciences Montpellier, University of Montpellier, CNRS, IRD, Montpellier, France; 2French Geological Survey (BRGM), Water, Environment, Process and Analyses Division, Orléans, France; 3France LGEI (Laboratoire de Génie de l’Environnement Industriel), Institut Mines-Télécom Alès, Alès, France; 4MINES ParisTech, PSL University, Centre de Géosciences, Fontainebleau, France

Passive and semi-passive treatment systems show great potential to treat AMD originating from abandoned mines. The aim of this study was to determine iron and arsenic removal yields of two field treatment devices, which were designed to optimize natural process of bio-oxidation and co-precipitation to clean-up mine waste water. Almost one year of monitoring showed efficiency and stability of the treatment under environmental and operational variations. Using assisted aeration and bacterial support in the devices, average arsenic and iron removals of 67% and 43% were achieved. Additional steps will be considered to reach water quality and sludge disposal requirements.

Casiot C, Pedron V, Bruneel O, et al (2006) A new bacterial strain mediating As oxidation in the Fe-rich biofilm naturally growing in a groundwater Fe treatment pilot unit. Chemosphere 64:492–496.

Egal M, Casiot C, Morin G, et al (2010) An updated insight into the natural attenuation of As concentrations in Reigous Creek (southern France). Appl Geochemistry 25:1949–1957.

Elbaz-Poulichet F, Bruneel O, Casiot C (2006) The Carnoules mine. Generation of As-rich acid mine drainage, natural attenuation processes and solutions for passive in-situ remediation. Difpolmine (Diffuse Pollut From Min Act

España JS, Pamo EL, Santofimia E, et al (2005) Acid mine drainage in the Iberian Pyrite Belt (Odiel river watershed, Huelva, SW Spain): Geochemistry, mineralogy and environmental implications. Appl Geochemistry 20:1320–1356.

Fernandez-Rojo L, Casiot C, Laroche E, et al (2019) A field-pilot for passive bioremediation of As-rich acid mine drainage. J Environ Manage 232:910–918.

Fernandez-Rojo L, Casiot C, Tardy V, et al (2018) Hydraulic retention time affects bacterial community structure in an As-rich acid mine drainage (AMD) biotreatment process. Appl Microbiol Biotechnol 102:9803–9813.
Fernandez-Rojo L, Héry M, Le Pape P, et al (2017) Biological attenuation of arsenic and iron in a continuous flow bioreactor treating acid mine drainage (AMD). Water Res 123:594–606.

Laroche E, Casiot C, Fernandez-Rojo L, et al (2018) Dynamics of Bacterial Communities Mediating the Treatment of an As-Rich Acid Mine Drainage in a Field Pilot. Front. Microbiol. 9

Méndez-García C, Peláez AI, Mesa V, et al (2015) Microbial diversity and metabolic networks in acid mine drainage habitats. Front Microbiol 6:1–17.

van der Lee J, De Windt L, Lagneau V, Goblet P (2003) Module-oriented modeling of reactive transport with HYTEC. Comput Geosci 29:265–275.

10:15am - 10:40am
ID: 640 / S_5_2: 2
Full Paper - Oral Presentation
Topic: 2 Passive Treatment Innovation, Bio-Geochemical Systems, 5 Mine Water Treatment Systems, 11 Decarbonisation, Sustainability, Circular Economy in Mine Water Treatment (inc. Mine Water Enthalpy & Device Development), Mine Wastes, Sludges (inc. Valorisation & Harvesting), Mine Sites
Keywords: Semi-passive bioprocess, biological sulphate reduction, partial sulphide oxidation, sulphur recovery

Performance Of The Hybrid Linear Flow Channel Reactor: Effect Of Reactors In Series For Enhanced Biological Sulphate Reduction And Sulphur Recovery

Tynan Steven Marais1, Rob John Huddy1, Rob Paul van Hille2, Susan Therese Largier Harrison1

1University of Cape Town, South Africa; 2Moss Group

Acid rock drainage (ARD) is a global crisis that will have long-lasting environmental consequences. The application of semi-passive biological sulfate reduction (BSR) is a potential solution for the remediation of persistent low-volume ARD effluents. However, major challenges of BSR, including slow reaction kinetics and management of the generated sulfide, still need to be addressed. The development of a hybrid Linear Flow Channel Reactor (LFCR) has shown promise for remediation of sulfate-rich effluents. In this study, the operation of two hybrid LFCRs connected as a dual reactor system was assessed for the improved removal of residual sulfide and COD.

Marais, T.S., Huddy, R.J., Harrison, S.T.L. van Hille, R.P. (2020) Demonstration of simultaneous biological sulphate reduction and partial sulphide oxidation in a hybrid linear flow channel reactor. Journal of Water Process Engineering.

Marais, T.S., Huddy, R.J., Harrison, S.T.L., van Hille, R.P. (2020) Effect of hydraulic residence time on biological sulphate reduction and elemental sulphur recovery in a single-stage hybrid linear flow channel reactor. Biochemical Engineering Journal.

Marais, T.S., Huddy, R.J., van Hille, R.P., Harrison, S.T.L. (2020) Effects of reactor geometry and electron donor on performance of the hybrid linear flow channel reactor. Hydrometallurgy.

10:40am - 11:05am
ID: 638 / S_5_2: 3
Full Paper - Oral Presentation
Topic: 6 Ecology: Opportunities from Stabilisation, Erosion Control, Ecological Indicators for verifying River Health (i.e. following interventions) + Design and Management of Wetlands to enhance Biodiversity, 7 Mine Closure
Keywords: macroinvertebrates, coal, plankton, diatoms, water quality

Saline Pit Lakes – What Biodiversity Values Can They Offer At Closure And Beyond?

Mark Lund, Melanie Blanchette

Mine Water and Environment Research Centre, Edith Cowan University, Australia

Closure of saline pit lakes is problematic as they are considered to have few prospects for future uses. In 2019, we assessed limnology and biodiversity of a two saline pit lakes (≈3.2-10.5 mS cm-1) from each of Australia’s main coal regions (Hunter Valley and Bowen Basin), one of which was rehabilitated.

Quarterly concentrations of nutrients, metal/metalloids and major ions were measured top and bottom with physico-chemical profiles throughout the water column. Aquatic biodiversity was assessed through macroinvertebrates, diatoms, and plankton communities.

Lakes were temperature but not salinity stratified and had limited metal/metalloid concentrations of concern. Salinity did not appear to limit biodiversity.

Associate Professor Mark Lund is the Mine Water and Environment Research Centre (MiWER) principal at Edith Cowan University. He and his team have been studying the ecology of pit lakes for over 25 years. He is particularly interested in applied approaches to ecosystem development that can be used in pit lakes to improve outcomes following closure.

11:05am - 11:30am
ID: 612 / S_5_2: 4
Full Paper - Oral Presentation
Topic: 7 Mine Closure, 8 Mine Hydrogeology
Way of Presentation: Pre-Recorded
Keywords: IMWA2021, Ireland, limestone, recharge, underground, porosity, storage, closure

Recharge-driven Underground Dewatering And Post-closure Groundwater Recovery

Simon Sholl1, Stephen Wheston2, Geoff Beale1

1Piteau Associates, Canon Court West, Abbey Lawn, Shrewsbury SY5 8AN, United Kingdom; 2Tembusu Ltd, 1 Killastafford Cross, Cashel, Co Tipperary, Ireland

Lisheen Mine, located in Tipperary, Ireland, was operational between 1999 and 2015. Through most of mine life, dewatering rates were typically within a seasonal range of 60 to 90 MLD, and rapidly changed with precipitation, which reflected the low storage of the limestone bedrock. After closure, groundwater levels in the mine workings rose over 120 m in the first three months, further demonstrating the low storage of the bedrock. Full recovery of the workings was confirmed in early 2018, 2 years after closure, when the natural seasonal variation in groundwater levels had re-established.

Sholl S (2020) Applied Water Balance Modelling and Surface Water Management. Geological Society of South Africa Mine Water Management webinar series.

11:30am - 11:55am
ID: 634 / S_5_2: 5
Full Paper - Oral Presentation
Topic: 7 Mine Closure, 8 Mine Hydrogeology
Keywords: groundwater rebound, finite-element modelling, flooding, underground mine, hard coal

Finite-element Modelling Approach To Study Flow Processes During Groundwater Rebound In Abandoned Underground Hard Coal Mines

Timo Kessler, Maria-Theresia Schafmeister

University of Greifswald, Germany

Groundwater rebound is one of the key challenges for the renaturation of underground mines. Numerical models can support the computation of rebound curves and the identification of long-term groundwater levels after steady-state conditions are reached. The present finite-element model case was to test the combination of different flow types and parameter configurations inside mine workings in order to optimally represent the flow patterns in cavity volumes and fractured rock masses. The approach may be an alternative to common pond-and-pipe models, particularly, if estimated cavity volumes of mine workings are uncertain or if groundwater levels in the surroundings are precarious.

Kessler T, Mugova E, Jasnowski-Peters H, et al (2020) Grundwasser in ehemaligen deutschen Steinkohlenrevieren – ein wissenschaftlicher Blickwinkel auf Grubenflutungen. Grundwasser 25:259–272.

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