Technology Innovation News Survey

Department of the Interior, Office of Surface Mining (OSMRE), Funding Opportunity S19AS00005, 2019

The Mine Drainage Technology Initiative (formerly the Acid Mine Drainage Initiative) provides a forum for collaboration and information exchange to enable members to develop (1) an understanding of acidic and toxic mine drainage (MD) for better prediction, avoidance, monitoring, and remediation; (2) innovative solutions to MD water-quality problems; (3) "best science" practices to predict MD prior to mining; and (4) successful remediation practices for existing sources of MD and optimum prevention technologies. OSMRE seeks studies that address the above-listed goals. About 10 awards are anticipated out of estimated program funding of $200,000. The closing date for applications is July 8, 2019. https://www.grants.gov/web/grants/view-opportunity.html?oppId=315483

Department of State, Bureau of Oceans and International Environmental and Scientific Affairs, Funding Opportunity SFOP0005869, 2019

Papua New Guinea (PNG) is preparing for obligations it will take on for its artisanal and small-scale gold mining (ASGM) sector once it joins the Minamata Convention on Mercury. Specifically, information obtained through this project will be instrumental in the development of PNG's National Action Plan for ASGM. This project will inventory the indigenous ASGM sector in PNG to determine how much mercury and what kinds of processing techniques are being used, as well as associated demographics. Only U.S. nonprofit/nongovernmental organizations [501(c)(3)], foreign nonprofit organizations, and public international organizations are eligible for this grant. A single award is anticipated from estimated funding of $398,000. The closing date for applications is July 8, 2019. https://www.grants.gov/web/grants/view-opportunity.html?oppId=315821

Dept. of Interior, Office of Surface Mining Reclamation and Enforcement, Lakewood, CO.
Federal Business Opportunities, Solicitation 140S0319R0001, 2019

The Office of Surface Mining Reclamation and Enforcement's Western Region Federal Reclamation Program (WR-FRP) intends to solicit for the services of a geotechnical engineering firm to provide A-E design services for the reclamation of hazardous abandoned coal mine sites under NAICS code 541330. The engineering work will include site investigations; exploratory drilling or excavation; sampling and analysis of mine gases and mine drainage; surveys, site map development, and historic mine map research; development of reclamation design alternatives; and other work elements as specified in the delivery orders. The WR-FRP is responsible for sites located primarily in the State of Washington; potentially in California, Oregon, Arizona, and South Dakota; and on reservation lands affected by historic coal mining. Go to FedConnect for solicitation details at https://www.fedconnect.net/FedConnect/?doc=140S0319R0001&agency=DOI [Note: It might be necessary to copy and paste the URL into your browser for direct access]. Release of the solicitation is anticipated in July 2019. https://www.fbo.gov/spg/DOI/OSM/1438/140S0319R0001/listing.html

Department of the Interior, Office of Surface Mining Reclamation and Enforcement (OSMRE), Funding Opportunity S19AS00003, 2019

The not-for-profit Acid Mine Drainage (AMD) Reclamation-Watershed Cooperative Agreement Program seeks applications from eligible participants to restore streams affected by AMD to a level that will support a diverse biological ecosystem and provide recreational opportunities for the community. Eligibility is limited to not-for-profit organizations with IRS 501(c)(3) status. Federal, state, or local governments and colleges or universities are not eligible to receive direct funding. Cost sharing is not required. About 20 awards are anticipated out of estimated total program funding of $3.5M (Award Ceiling: $100,000 -- Award Floor: $35,000). Applications will be considered on a continuing/rolling basis as they are received. Closing date: September 6, 2019, at 11:59 PM ET. https://www.grants.gov/web/grants/view-opportunity.html?oppId=315023

U.S. Environmental Protection Agency, Cincinnati Acquisition Division, OH.
Federal Business Opportunities, Solicitation 68HERC19R0052, 2019

U.S. EPA anticipates making about 20 Phase I SBIR awards of up to $100,000 each and not to exceed a 6-month term of performance. The likely contract start date is April 1, 2020. The Phase I effort is for "proof of concept" of the proposed technology. Among the 15 listed areas of interest are mining site characterization and remediation technologies; novel technologies for the destruction of PFAS in water and wastewater; and a 3-D gamma camera to map radiological contamination. The slides and Q&A follow-up from EPA's informational SBIR webinar of June 6 are available near the bottom of the page at https://www.epa.gov/sbir/informational-webinar-2019-2020-small-business-innovation-research-sbir-phase-i-solicitation. The attachments to this notice are available only on FedConnect at https://www.fedconnect.net/FedConnect/?doc=68HERC19R0052&agency=EPA [Note: It might be necessary to copy and paste the URL into your browser for direct access]. The entire SBIR proposal must be submitted in a single PDF file via FedConnect by 12:00 noon ET on July 31, 2019. https://www.fbo.gov/spg/EPA/OAM/OH/68HERC19R0052/listing.html

Environmental Protection Agency, Office of Acquisition Solutions, Region VII, Lenexa, KS.
Federal Business Opportunities, Solicitation 68HE0719R0016, 2019

EPA has posted a total small business set-aside presolicitation notice on FedBizOpps for a requirement for the Southwest Jefferson County Mining Superfund Site remediation of OU1 residential soils under NAICS code 562910. When additional details are available, they will be posted on FedConnect at https://www.fedconnect.net/FedConnect/?doc=68HE0719R0016&agency=EPA or under reference number 68HE0719R0016. https://www.fbo.gov/spg/EPA/OAM/RegVII/68HE0719R0016/listing.html

Jenkins, J. | Technical Sessions: Smart Mining: Resources for a Connected World, 24-27 Feb 2019, Denver, Colorado. p 76, 2019

A novel in-tunnel treatment remedy is operating at the Captain Jack Mill Superfund Site near Ward, Colorado. The remedy includes bulkhead with a flowthrough pipe, limestone-packed adit section, recirculation system, monitoring wells with in situ water quality monitoring, and an electroresistivity-tomography system. The concept involves flooding the mineralized zones along the adit, providing initial neutralization, recirculation, monitoring water quality changes near the adit, and determining if pre-mining conditions can be achieved. System design allows flexibility for additional amendments, if needed. Operations began in March of 2018. See more on this project in a video presented by Mary Boardman at the 2018 San Juan Mining & Reclamation Conference, Creede, Colorado: https://www.youtube.com/watch?v=bwKPSF8Sk30&list=PLXA4wMzLaGizkJ0RDi9TFs-ReuG6uXGyW&index=13&t=0s.

Bennett, M., T. Henderson, and A. Coleman.
36th Annual Meeting of the American Society of Mining & Reclamation, 3-7 June, Big Sky, MT, 73 slides, 2019

In late 1960, Soda Butte Creek was considered the most polluted stream entering Yellowstone National Park. The contamination source was the McLaren Tailings impoundment, constructed in the historic channel and floodplain of Soda Butte Creek from 1934 to 1953. A remedial design was developed to stabilize/remove 191,140 m³ of mine tailings, mine wastes, and impacted soils; construct an on-site repository, a site-wide dewatering system and water treatment system, and 1,219 linear meters (LM) of stormwater conveyance channels/infiltration systems; reconstruct 610 LM of Soda Butte Creek and Miller Creek; and revegetate 10 ha. The project turned a previously unusable area back to its historical landscape while cleaning up the contaminated Soda Butte Creek and preserving important fishery and natural resources of Yellowstone National Park. Construction began in June 2010, and the project was completed in fall 2015. After 4 years, the site is functioning as a stable landform. In 2018, the Montana Department of Environmental Quality delisted the creek from Montana's list of impaired waters 303d list. https://www.asmr.us/Portals/0/Documents/Meetings/2019/PowerPoints/1B_300_Bennett.pptx. See EPA fact sheet for more information https://www.epa.gov/sites/production/files/2018-11/documents/mt_sodabutte_1768_508.pdf

Barnes, M. | 36th Annual Meeting of the American Society of Mining & Reclamation, 3-7 June, Big Sky, MT, 48 slides, 2019

Restoration of French Gulch and Moose Creek was completed to support native fisheries reintroduction goals in the Mount Haggin Wildlife Management Area, MT. The area was mined extensively in the 19th century, resulting in large remnant tailings piles, a reduced aquatic habitat, and a confined French Gulch without connection to a functioning floodplain and lack of fluvial complexity. Stream reaches were identified for reference and varying levels of restoration based on the degree of impacts. Restoration areas were modeled to determine shear stress values and approximate particular areas requiring increased stability and roughness to withstand up to a 4% annual clearance flood. Areas of additional remnant tailings removal were identified during construction and completed to increase flood storage and riparian connection to French Gulch. Construction was completed in fall 2016 ahead of schedule and under budget. Monitoring of stream response was conducted in 2017 and compared to post-projects data. Pre-existing and post-project data were used to estimate % reduction in sediment load in tons/yr for total maximum daily loads allocations. https://www.asmr.us/Portals/0/Documents/Meetings/2019/PowerPoints/2B_430_Barnes.pptx. See final report http://www.bhwc.org/wp-content/uploads/French-Gulch_Moose-Creek-Final-Report-FINAL_web.pdf See video https://www.asmr.us/Watch-Video?v=201900100

Gamal, M., D. Hibbard, and M. Bautz.
36th Annual Meeting of the American Society of Mining & Reclamation, 3-7 June, Big Sky, MT, 23 slides, 2019

The recent backfilling of mine voids in areas that were previously mitigated in the late-1980s and mid-1990s was a challenging project. The mines are located within poor to very poor-quality bedrock at the Glenrock No. 1 and No. 2 Mines in Wyoming. Parts are flooded and were likely the cause of localized flooding within adjacent homes due to the unusually high water table. Grout was injected in areas to ensure that mine voids, rubble, and weak disturbed overburden rock were sufficiently filled with grout. The elasto-plastic rebound of the poor-quality rock caused grout to return to the ground surface upon cessation of grout injection. Recommendations were presented to minimize and control such events. Also presented was a detailed groundwater study to determine if the deformation associated with mine subsidence in Glenrock caused fracturing of the weak overburden rock allowing permeation of water to assist in creating artificial artesian conditions within and above the historic Glenrock No. 1 and No. 2 Mine. https://www.asmr.us/Portals/0/Documents/Meetings/2019/PowerPoints/8C_1100_Gamal.pptx

Beam, R.L. | 2019 West Virginia Mine Drainage Task Force Symposium, 26-27 March, Morgantown, WV, 49 slides, 2019

Coal mining began in Pennsylvania in the mid-18th century. As a result of mining activities, most of which occurred prior to any environmental regulations, significant damage to water resources has occurred. PA currently has in excess of 5,500 miles of streams impaired due to coal mine drainage. This presentation provides an overview of Pennsylvania's current and planned active treatment facilities. The history and treatment configurations of the sites are presented as well as cost-benefit analyses for each of the facilities. The presentation also shares some unique challenges, practical applications, and lessons learned. https://wvmdtaskforce.files.wordpress.com/2019/03/2019-1600-beam-bamr-active-treatment-systems-2019-wv_task_force_final-version.pdf. More information http://files.dep.state.pa.us/Mining/Abandoned%20Mine%20Reclamation/AbandonedMinePortalFiles/OperationScarlift/History_of_SL_AMD_Facilities_in_PA.pdf

Anton, N.R., D.T. Shanight, C.S. Storrar, M.J. Fischer, E.M. Janoviak, and B. Lala,
36th Annual Meeting of the American Society of Mining & Reclamation, 3-7 June, Big Sky, MT, 26 slides, 2019

At the mine waste repository for the Upper Tenmile Creek Mining Area Superfund Site, Montana, collected leachate water has been managed in an active water treatment plant and pilot biochemical reactor (BCR) system, with disposal to a land application disposal (LAD) system since 2003. In 2018, the design was completed for a full-scale leachate passive treatment system utilizing parallel BCR cells, post-treatment settling, aeration, limestone channels, and a gravity-operated LAD system. The new system construction will begin in 2019, and the existing water treatment infrastructure will be decommissioned after the new system is operational and functional. The presentation includes the critical passive treatment design components and provides details of the pre-design investigation and design approach for the LAD system, including field siting for the LAD, test pits, soil lithology logging, permeability testing, soil metal sorption studies, metal sorption capacity and water balance calculations, and hydraulic design of the LAD. https://www.asmr.us/Portals/0/Documents/Meetings/2019/PowerPoints/8A_1130_Anton.pptx More information: https://itrcweb.org/bcr-1/Content/Appendix%20B%20Case%20Studies/B15%20Luttrell%20Case%20Study.htm

Bouchard, E., C. Prentice, R. Herbert, R. Martz, B. Eisner, V. Friesen, and M. Simair.
41st British Columbia Mine Reclamation Symposium, 17-20 September, Williams Lake, BC, 2018

The Minto Mine is following a phased approach for the design and implementation of a constructed wetland treatment system (CWTS) for water treatment at closure. The CWTS is currently in the demonstration-scale and optimization stage preceding full-scale implementation. The CWTS has successfully treated constituents of potential concern in the mine site's sub-arctic continental climate. Carex aquatilis (aquatic sedge) and aquatic mosses (bryophytes) from natural wetlands onsite were used for planting, while water mine-impacted seepage water was used as feed water. The CWTS was designed to target specific physicochemical parameters for treatment (confirmed and refined through off-site pilot-scale testing), which enable denitrifying selenium- and sulfate-reducing bacteria to treat nutrients, metals, and metalloids in the water. The CWTS treated targeted constituents of potential concern in the following extents and percentages: cadmium 80% (from 0.0261 µg/L to 0.0092 µg/L), copper 65% (from 49.1 µg/L to 17.3 µg/L), molybdenum 58% (from 6.3 µg/L to 2.7 µg/L), selenium 89% (from 4.0 µg/L to 0.5 µg/L), zinc 98% (from 49.2 µg/L to 1.9 µg/L), and nitrate as N 97% (from 6.5 mg/L to 0.19 mg/L). Continued trials were underway in 2018 to investigate treatment under a wider range of operational conditions. https://open.library.ubc.ca/cIRcle/collections/59367/items/1.0374546 More information http://www.emr.gov.yk.ca/mining/pdf/mml-minto-rcp-v2018-01-appendix-a6.pdf

Drak, A. | Water in Mining Conference, 9-10 April, Toronto, ON, 34 slides, 2019

The MaxH₂O Desalter technology was pilot-tested to measure its effectiveness of treating acid mine drainage. The system removes sulfate ions by crystallization of calcium sulfate in the Crystalactor® while concentrating the wastewater in a reverse osmosis (RO) system. During the pilot, continuous crystallization of the calcium sulfate in the integrated salt precipitation unit maintained the saturation index in the range of 800%-1,200% during operation. The system operated without the addition of chemicals other than antiscalant and produced pellets of more than 90% dry solids content that do not require further sludge dewatering treatment. Depending on the effluent requirements, the obtained RO brine stream can be partially or completely blended with the RO product, further increasing the total recovery of the system. https://waterinmining.net/wp-content/uploads/sites/61/2019/04/Alex-Drak.pdf. Also see https://www.royalhaskoningdhv.com/crystalactor/-/media/crystalactor/files/articles-and-papers/2018-maxh2o-a-perfect-solution-for-treating-acid-mine-drainage-waste-water.pdf

U.S. EPA Region 8, 1050 pp, 2017

In 2014, two treatability studies were conducted for the Barker-Hughesville Mining District Superfund Site as part of the remedial investigation/feasibility study process. Year 2 of the Danny T Adit study continued the 2013 year 1 field pilot study to evaluate various passive and semi-passive methods for treatment of the Danny T Mine adit water. The bench-scale study for the Tiger Mine was focused on potential in situ-based treatments that could be deployed inside the underground mine workings area. A representative mine discharge water (Tiger mine adit TI-AD004, the "Firehose" adit) was collected in bulk and analyzed at the treatability laboratory in batch container tests with various reagents. The report summarizes each of these studies, including their objectives, experimental and sampling procedures, results, conclusions, and recommendations. https://semspub.epa.gov/work/08/1817788.pdf

Opara, A., J. Adams, J. Fudyma, and J. Bowden.
Journal of American Society of Mining and Reclamation 7(2):19-34(2018)

This study presents three bench- and onsite pilot-scale case studies using electro-biochemical reactor (EBR) technology for Se, U, and NO₃ bio-reduction and removal from mining wastewaters. The studies used different mining waters and each were contaminated with varying concentrations of Se, U, and NO3. The EBR technology treated the waters to <0.5-3.2 µg/L Se, <0.1-0.8 µg/L U, and <0.02-<2 mg/L NO₃ -N.https://www.asmr.us/Portals/0/Documents/Journal/Volume-7-Issue-2/Opara-UT.pdf

Walker, W.J., D. Tooke, M. Wright, J. Hamilton, C. Schreier, and J. Peterson.
Journal American Society of Mining and Reclamation 7(3):20-44(2018)

This bench study tested whether a permeable reactive barrier (PRB) could treat Se-contaminated groundwater and seep water from a phosphate mine in Idaho. The study consisted of: (1) a test to determine the chemistry of the site-water and the components of the proposed PRB, (2) batch leaching studies, and (3) vertical column studies testing the PRB media. The groundwater Se was reduced from 1 mg/L, to < 0.02 mg/L in the first 3 hours of column contact time, well below the 0.05 mg/L water quality goal. Aside from Se reduction, no significant deleterious changes to water quality were observed when compared to primary water quality standards. https://www.asmr.us/Portals/0/Documents/Journal/Volume-7-Issue-3/Walker-WA.pdf

Kiiskila, J.D., D. Sarkar, S. Panja, S.V. Sahi, and R. Datta.
Ecological Engineering 129:97-108(2019)

The study developed a cost-efficient and sustainable floating treatment wetland system using vetiver grass (Chrysopogon zizanioides). Year-long large- and small-scale hydroponic experiments were used to determine the effectiveness of vetiver for treating acid mine drainage-impacted waters from the Tab-Simco mine site in southern Illinois. For the large-scale mesocosm study, vetiver rafts were suspended in 100-gal containers. Water quality was monitored every 28 days and at the end of the experiment (364 days); plant health was monitored by measuring changes in biomass and recording visual changes in root and shoot coloration and morphology. There was higher net removal of Fe (81%) and Pb (81%) with lower removal of Ni (38%), Zn (35%), SO₄^2- (28%), Mn (27%), Cr (21%), Al (11%) and Cu (8.0%). Toxicity characteristic leaching procedure showed that vetiver biomass was not hazardous waste as a result of metal accumulation. From the small-scale experiment, there was near complete removal of SO₄^2- (91%) and metals (90-100%) with the exception of Pb (15%) and Cu (0.0%).

Gonzales, D., Y. Liu, D.V. Gomez, G. Southam, S. Hedrich, P. Galleguillos, C. Colipai, et al.
Minerals Engineering 131:370:375(2019)

This study tested the performance of a low pH sulfidogenic bioreactor inoculated with an indigenous microbial community to treat mine-impacted water. The inoculum was obtained from anaerobic sediments collected from an acidic river located in northern Chile. The sulfidogenic bioreactor system (2.3 L) was operated as a continuous flow mode unit for 99 days at 30°C and fed with synthetic water based on the chemical composition of the acidic river. The bioreactor pH was set to 4.5 initially and was increased in stages to pH 6.0 during the experiment. Results show that zinc concentrations in liquors draining the bioreactor were below the detection level in most of the samples analyzed. Increasing the glycerol concentration increased the removal of iron (70%), but generated acetic acid (from 1 to 5 mM). Microbial populations changed with varying operation parameters, and a known acetogenic sulfidogen (Desulfoporosinus acididurans) became more dominant over time.

Gugushe, A.S., A. Nqombolo, and P.N. Nomngongo.
Molecules 24:1792(2019)

This study tested the effectiveness of magnetic multi-walled carbon nanotube/zeolite nanocomposites to adsorb and remove arsenic ions in simulated and real acid mine drainage samples. Adsorption studies demonstrated that the nanoadsorbent can remove arsenic in simulated samples within 35 min. After separation from the solution, the nanoadsorbent was washed in a 0.05 mol/L HCL solution for regeneration, and was reusable for at least 10 cycles of adsorption-desorption with no significant decrease in the adsorption capacity. The nanoadsorbent was also used for the arsenic removal from acid mine drainage. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6539454/pdf/molecules-24-01792.pdf

Saha, S. and A. Sinha.
Global NEST Journal 20(3):512-528(2018)

The present study reviewed different aspects of treating acid mine drainage (AMD) with active treatment and waste materials and factors associated with the treatment process. The results from the investigation showed that fly ash, metallurgical slag, and cement kiln dust raise the pH of acidic solution more, in comparison to zero-valent iron and organic waste, due to their richness in lime content. Metal removal from AMD varied, due to the composition of AMD and the characteristics of waste materials. https://journal.gnest.org/sites/default/files/Submissions/gnest_02610/gnest_02610_published.pdf

Festin, E.S., M. Tigabu, M.N. Chileshe, S. Syampungani, and P.C. Oden.
Journal of Forestry Research 30(2):381-396(2019)

This review documents the state-of-knowledge and identifies gaps in the restoration of the post-mining landscape in Africa through literature review. Findings included substantial progress in identifying species suitable for phytoremediation, a lack of studies to evaluate the feasibility of organic amendments to promote autochthonous colonization of mine wastelands or growth of planted species, and successful cases of large-scale post-mining restoration practices for limestone quarries in Kenya, sand mining tailings in South Africa, and gold mine wastelands in Ghana. This article is Open Access at https://link.springer.com/article/10.1007/s11676-018-0621-x.

Zipper, C., J. Skousen, and C. Jage.
Virginia Cooperative Extension, Publication 460-133, 14 pp, 2018

This publication presents guidance to design passive treatment systems for acid mine drainage. The mechanisms governing these systems' treatment effectiveness and performance are clearly described. https://vtechworks.lib.vt.edu/bitstream/handle/10919/84252/CSES-216.pdf?sequence=1

Bolgrien, D.W., T.R. Angradi, J. Bousquin, T.J. Canfield, T.H. DeWitt, R.S. Fulford, et al.
EPA 600-R-18-167, 109 pp, 2018

Case studies, data tools, and models are presented to illuminate multiple lines of inquiry focused on improving the public's use of ecosystem goods and services (EGS) concepts for addressing environmental, social, and economic problems. The report summarizes current strategies for using EGS case studies and models to support community decision-making while highlighting the broad use of the EnviroAtlas and Eco-Health Relationship Browser. https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100VBW0.txt

Williams, K.C., D.W. Bolgrien, J.C. Hoffman, T.R. Angradi, J. Carlson, R. Clarke, et al.
EPA 600-R-17-292, 61 pp, 2018

This report summarizes a systematic and comprehensive investigation of Remediation to Restoration to Revitalization (R2R2R) in the Great Lakes region. R2R2R is a place-based practice that requires ongoing communication amongst federal and state agencies, local governments, and citizens. Data from the Great Lakes Area of Concern collaboration were analyzed to identify forces that shaped decisions, participation, and the inclusion of stakeholder and public values. Two frameworks were then created that can be used to facilitate interpretation and transparency. One framework can be applied to decision contexts to discuss who-what-how decision outcomes. The second framework can be used to interpret distinct values and facilitate communication or comparison across boundaries of experience or responsibility. The frameworks are designed to improve transparency and facilitate conversations about decisions and ecosystem services. https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100VWI8.txt

U.S. EPA, Office of Research and Development, Gulf Breeze, FL.
EPA 600-R-18-183, 41 pp, 2018

Research outputs from the Community-Based Final Ecosystem Goods and Services Project in the Sustainable and Healthy Communities National Research Program are presented. The report summarizes how community-based studies have previously utilized ecosystem services to inform aspects of their decision-making, identify best practices that might transfer to other communities, and identify gaps in those practices. https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100UOIR.txt

U.S. EPA, Office of Research and Development, Gulf Breeze, FL.
EPA 600-R-18-189, 32 pp, 2018

Research and development conducted under the Sustainable and Healthy Communities Research Program is intended to inform and empower decision-makers to weigh and integrate human health, socio-economic, environmental, and ecological factors to foster sustainability in the built and natural environments. This report describes EPA's research to incorporate the sustainability of final ecosystem goods and services production and benefits into community-scale decision making at study sites around the United States. https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100UOJW.txt

Ali, H.E.B., C.M. Neculita, J.W. Molson, A. Maqsoud, G.J. Zagury.
Minerals Engineering 134:325-344(2019)

This paper reviews the principal parameters and processes that influence the quality of mine drainage (MD) and the performance of passive treatment of MD in cold climates. Major factors that affect treatment performance of passive systems are highlighted, such as low temperature, contamination level, and salinity. This review also discusses the effect of MD contamination level on passive biochemical reactor (PBR) efficiency. The effect of high salinity is discussed, with its potential to increase or decrease metal and sulfate removal depending on the major ions present. Reactive transport models used to predict long-term MD treatment efficiency are also considered. Further studies are needed to evaluate the simultaneous combined effect of these parameters on the performance of PBRs. https://www.imwa.info/docs/imwa_2018/IMWA2018_BenAli_245.pdf

Naidu, G., S. Ryu, R. Thiruvenkatachari, Y. Choi, S. Jeong, and S. Vigneswaran.
Environmental Pollution 247:1110-1124(2019)

This review underscores characteristics and implication of acid mine drainage (AMD), remediation approaches in mining sites, alternative treatment technologies for water reuse, and resource recovery. The role of membrane processes and alternative treatment technologies to produce water for reuse from AMD is highlighted. This review provides insights in establishing reuse and resource recovery as the holistic approach towards sustainable AMD treatment. Finally, integrated technologies that deserve in-depth future exploration are highlighted.

Skousen, J.G., P.F. Ziemkiewicz, and L.M. McDonald.
The Extractive Industries and Society 6(1):241-249(2019)

This article discusses the process of acid mine drainage (AMD) formation and use of preventive and control measures and describes treatment methods for existing AMD discharges. This article is Open Access at https://reader.elsevier.com/reader/sd/pii/S2214790X18302156?token=A3BE69AB229BC63A39426B9553D03F4461A550E708323360211B572373D0AD06712EDBC689AFE7B6DFC13A886437321E.

Tigue, A.A., R.A. Malenab, and M.A. Promentilla.
MATEC Web of Conferences 268:06019(2019)

This paper identifies what has been studied and what the biggest challenges and limitations are on the use of permeable reactive barrier for acid mine drainage treatment. The reactive media used in permeable reactive barriers are organized into five categories: iron-based, organic-based, inorganic minerals-based, industrial waste-based, and combined media. The majority of research used combined media as the reactive substrate. The future direction is toward the use of combined media as a reactive material for acid mine drainage treatment. https://www.matec-conferences.org/articles/matecconf/pdf/2019/17/matecconf_rsce18_06019.pdf

Park, I., C.B. Tabelin, S. Jeon, X. Li, K. Seno., M.Ito, and N. Hiroyoshi.
Chemosphere 219:588-606(2019)

This paper reviews two alternative strategies-prevention techniques and mine waste recycling-for the management of acid mine drainage (AMD) and mine tailings. In this review, recent advances in AMD prevention techniques like oxygen barriers, utilization of bactericides, co-disposal and blending, and passivation of sulfide minerals are discussed. In addition, the paper introduces the recycling of mine tailings as construction and geopolymer materials to reduce the amounts of wastes for disposal.