Phuong Thao Dang¹, Van Thao Le²

¹ Hanoi University of Mining and Geology, 18 Vien Street, Duc Thang Ward, Bac Tu Liem District, Hanoi, Vietnam; E-mail: dangphuongthao@humg.edu.vn

²Vietnam Mining Science and Technology Association, 655 Pham Van Dong, Co Nhue 1 Ward, Bac Tu Liem District, Hanoi, Vietnam; E-mail: thaolv51@gmail.com

Corresponding author: dangphuongthao@humg.edu.vn

ABSTRACT.  In recent years, in Quang Ninh coal underground mine, longwall mining has been increasingly applied to meet the energy demand. This has resulted in the potential for increased mining dust. Coal dust is not only harmful to workers but also creates a risk for coal dust explosions in the mine. Therefore, in order to control the mine dust problem, it is necessary to develop a set of dust removal equipment suitable for underground coal mining. High-pressure water ejector system is selected to control dust in Quang Ninh mine. In addition, parameters and criteria for the design of the high-pressure water jet ejector systems have been presented.

Key words: high pressure water ejector system; dust control; air dust reduction; dust hazard

https://doi.org/10.58903/u17190825

Appling high water pressures ejector system to control dust in Quang Ninh underground coal mine

References

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Bałaga, D. (2019). Assessment of efficiency in reduction of dust concentration in mineral processing plants using the state-of-the-art technical measures. New trends in production engineering, 2(1) 11-19. https://doi.org/10.2478/ntpe-2019-0001

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Wu,^, L., Chen, H., Li, J., Fu, S. & Zhuang Y. (2021). Dust concentration changing regularities and dust reduction technology by spray negative pressure in fully mechanized mining face. Hindawi Geofluids, 2021, Article 1391673. https://doi.org/10.115/2021/1391673

Angel Zabchev, Romeo Alexandrov

University of Mining and Geology “St. Ivan Rilski”, Sofia 1700, email: angel.zabtchev@mgu.bg

Abstract: Based on a patented electromagnetic separator with six electromagnets (EM), a supply voltage and thyristor rectifier are proposed for generating current through the electromagnets. The currents in the six electromagnets create a travelling magnetic field that transports the magnetic material. The control pulses and the harmonic composition of the current are analytically determined.

Keywords: electromagnetic separation, travelling magnetic field, thyristor rectifier control, harmonic composition of voltage and current

DOI: https://doi.org/10.58903/u17190835

CURRENT CONTROL OF THE ELECTROMAGNETIC SEPARATOR

References:

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Fabris, L. A. & Cappelli, M. A. (2013). Travelling magnetic field plasma accelerator, Proceedings of the 33rd International Electric Propulsion Conference, The George Washington University, Washington, D.C., USA, IEPC–2013-86, October 6-10, 2013.

Kumar, H. S., Takahashi, M., & Ohnishi, N. (2020). Numerical simulation of particle acceleration in travelling magnetic field thruster. Transactions of the Japan Society for Aeronautical and Space Science. Aerospace Tech. Japan, 18, (6), 317-322, DOI: 10.2322/tastj.18.317

Berdyshev, A. S., Djumabayeva, Z. Z., Abdullaev, A. A. & Mussabekov, A. (2021). Study on the travelling magnetic field water purifier, ICECAE 2021, IOP Conf. Series: Earth and Environmental Science, 939 (2021) 012022, doi:10.1088/1755-1315/939/1/012022

Xu, Y., Wei, L., Han, B., Guo, E., Wang, M. & Su, Y. (2018). Effect of a traveling magnetic field on micropore formation in Al-Cu alloys. Metals, 8(6), 448; https://doi.org/10.3390/met8060448

Shvydkiy, E., Baake, E. & Koppen D. (2020). Liquid metal flow under travelling magnetic field—solidification simulation and pulsating flow analysis. Metals 10(4), 532, https://doi.org/10.3390/met10040532

Li, L. (2010). Electrical and magnetic separation of particles. ETDs. https://openscholarship.wustl.edu/etd/210

Stener, J. (2015). Wet low-Intensity magnetic separation: measurement methods and modelling. Lulea University of Technology, ISBN 978-91-7583-464-1 (print), ISBN 978-91-7583-465-8 (pdf).

Cao, S., Wei, D. & Li, J. (2019). Effect of magnetic field in magnetic separation column on particle separation process based on numerical simulation. Journal of Engineering Science and Technology Review 12 (2) 2019 53 – 58, doi:10.25103/jestr.122.08.

Singh, V., Nag, S., Srikakulapu, N. G. & Mukherjee, A. K. (2023). Development of a novel magnetic separator for segregation of minerals of dissimilar electromagnetic properties. Minerals Engineering 193, 108009 https://doi.org/10.1016/j.mineng.2023.108009.

Nikolay Stoyanov, Stefan Dimovski

University of Mining and Geology “St. Ivan Rilski”, 1700 Sofia, e-mail: nts@mgu.bg; dimovski@mgu.bg

ABSTRACT. Until the end of the 20th century, the uncontrolled discharge of highly polluted emissions from the non-ferrous metals companies in Bulgaria was the cause of heavy contamination in vast areas around these industrial sites. In the last two decades, after the introduction of good environmental practices and the closure of polluting industries, a deceleration of the negative processes and a gradual cleaning of the already polluted waters and soils are observed. In order to evaluate and predict these processes, numerical 2D models of the conditions for the subsurface transport of contaminants from the wastewater in the effluent channel of KCM AD-Plovdiv are developed using the VS2DI computer programme. The scheme of convection-diffusion mass-transport is applied, taking into account the concomitant processes of reversible elimination, mechanical dispersion and mixing. Employing the developed models, the fate and transport of pollutants typical for this type of industrial sites – sulphate ions and cadmium (SO₄ and Cd) are studied, taking into account their concentration in the wastewater before and after the application of modern technologies and equipment for remediation of contaminated water. The computer simulation encompasses the period from the construction of the effluent channel till 2035.

Keywords: environment protection, mass transport models, groundwater and soil contamination, heavy metal pollution.

DOI: https://doi.org/10.58903/u17190834

MODELS FOR ASSESSING AND PREDICTING THE SUBSURFACE TRANSPORT OF CONTAMINANTS FROM THE WASTEWATER IN THE EFFLUENT CHANNEL OF KCM AD – PLOVDIV, SOUTHERN BULGARIA

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Mykola Stadnichuk¹, Oleksandr Krukovskyi², Serhii Kurnosov³, Serhii Makeiev⁴

 ¹Department of Mine Energy Complexes, M.S. Polyakov Institute of Geotechnical Mechanics NAS of Ukraine, Dnipro, Ukraine, E-mail: krosh1983@gmail.com

²Department of Rock Mechanics, M.S. Polyakov Institute of Geotechnical Mechanics NAS of Ukraine, Dnipro, Ukraine, E-mail: igtm@ukr.net

³Department of Mineral Mining at Great Depths, M.S. Polyakov Institute of Geotechnical Mechanics NAS of Ukraine, Dnipro, Ukraine, E-mail: sakurnosov@gmail.com

⁴Department of Mineral Mining at Great Depths, M.S. Polyakov Institute of Geotechnical Mechanics NAS of Ukraine, Dnipro, Ukraine, E-mail: smakeev@ukr.net

Corresponding author: Serhii Makeiev, E-mail: smakeev@ukr.net

ABSTRACT. The current paper is devoted to experimental tests of working protection means in the construction of which concrete in liquid state is used. Such means of protection are most vulnerable to irreversible deformations during the period of their hardening, which coincides with the period of intensive growth of pressure on them from the side of the rock massif. Studies have shown that the pressure of fake rocks on the working protection means depends significantly on the depth of its location and the category of collapse of the roof of the coal seam. The maximum pressure is reached at the moment before the collapse of the roof, that is, at the maximum values of the length of the console of fake rocks, which hangs over the produced longwall space and rests on the working protection means. It was established that the pressure of the fake roof of the coal seam and the relative vertical deformation of the district roadway protection means increase according to the logarithmic dependence of the distance to the longwall outcrop and the time of concrete hardening. With heavy and medium roof collapse, these processes are divided into two stages: in the first stage (the length of which corresponds to the step of the roof collapse), as the longwall moves, the pressure increases intensively, at the moment of collapse it drops by 15-20%, and in the second stage again increases, but 6-8 times more slowly than in the first one, and, provided the relative vertical deformation of the protective device stabilises, passes into a stable mode. With an easily collapsed roof, the step of its collapse does not have a significant effect on the growth and stabilisation of the stress-deformed state of the protective device. The mechanism was revealed and the regularities of loading and deformation of district roadway protection means from a quick-setting mixture depending on the time of its hardening and the distance to the outcrop of longwall, taking into account the category of stability of the roof of the coal seam, were established. Implementation of recommendations for the parameters and technology of the construction of a guard-isolation wall in the conditions of the “Chervonogradska” and “Lisova” mines of the SE “Lvivvugilya” made it possible to reduce the costs of cement-mineral mixture by 27% and save the belt roadways No. 562 and No. 166 for reuse in the production as ventilation during the working out of the adjacent trench column.

Key words: means of protection of district roadways, quick-setting mixtures, concrete packaged protection wall, load intensity of protection means.

DOI: https://doi.org/10.58903/u17190833

EXPERIMENTAL TESTS OF CONCRETE MEANS OF PROTECTION FOR COAL MINES DISTRICT ROADWAYS

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Stadnychuk, M. M., Kurnosov S. A., Makeiev, S.Y. Justification of the conformity of the quick-setting mmixture parameters to the conditions of using safety means for the district workings, Szkoła Eksploatacji Podziemnej 2023: Materiały Konferencyjne, Kraków, 27.02–1.03.2023, Kraków: Instytut Gospodarki Surowcami Mineralnymi i Energią Polskiej Akademii Nauk, (pp. 632-636). https://szkolaeksploatacji.pl/wp-content/uploads/2023/02/materialy_sep_2023.pdf.

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Rosen Ivanov, Petia Genova

University of Mining and Geology “St. Ivan Rilski”, 1700 Sofia; E-mail: r.ivanov@mgu.bg

Corresponding author: r.ivanov@mgu.bg

ABSTRACT. Sediment microbial fuel cells (SMFCs) are bio-electrochemical systems in which the anode is placed in the anaerobic sediment and the cathode is immersed in the surface layer of water. Natural exoelectrogenic bacteria decompose organic compounds in sediment, producing electrons and protons. The electrons reach the cathode through an external electrical circuit, while the protons pass through the soil layer, which acts as a kind of membrane. Oxygen is in many cases the preferred electron acceptor due to its presence in the cathode region and its high potential. Heavy metal ions and other compounds can also be reduced on the cathode, which will increase the energy generated. Based on the above characteristics, SMFCs would be suitable for application as biosensors for monitoring water pollution with heavy metals. In the present study, the possibility of application of SMFCs as biosensors for water pollution with copper has been studied. A high correlation was found between the concentration of copper ions in the range 0,1 – 100 mg/L and the voltage generated by SMFC. The constructed SMFC based biosensor showed wider detection limits for copper compared to other authors’ studies as the coefficient of determination reached 0,9911. Native exoelectrogenic bacteria were represented mainly by Geobacter, Clostridium, Anaeromixobacter and Bacillus.

Key words: sediment microbial fuel cell, biosensors, heavy metals detection

DOI: https://doi.org/10.58903/u17190693

Sediment microbial fuel cell based biosensor for real time detection of Cu²⁺ in industrial wastewaters – operation and effectiveness

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Emmanuel Ababio Ofosu-Mensah

Department of History, University of Ghana, Legon, Accra, Ghana, West Africa;
E-mail: eaofosu-mensah@ug.edu.gh ORCID: 0000-0003-4376-1849

Corresponding author: eaofosu-mensah@ug.edu.gh

ABSTRACT: This study examines precolonial gold mining in Akyem Abuakwa in Ghana’s Eastern Region. It uses a historiographical approach, combining primary and secondary data and oral interviews to show the mineral processing and metallurgical technology used in mining Abuakwa gold in the historic period. It also demonstrates that precolonial gold mining in Akyem Abuakwa was less destructive to the environment, compared to the modern mining. It also highlights the techniques utilised by native Africans to mine gold, before the advent of Western technology and finance.

Key words: Small-scale artisanal gold mining, mineral processing, metallurgical technology, Akyem Abuakwa, Ghana

DOI: https://doi.org/10.58903/u17190832

TRADITIONAL GOLD MINING IN AKYEM ABUAKWA IN GHANA’S EASTERN REGION

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Dimitar Kaykov¹, Danail Terziyski², Kremena Arsova-Borisova³, Milan Stajić⁴

¹University of Mining and Geology “St. Ivan Rilski”, 1700 Sofia; E-mail: dimitar.kaykov@mgu.bg
²University of Mining and Geology “St. Ivan Rilski”, 1700 Sofia; E-mail: d.terziyski @mgu.bg
³University of Mining and Geology “St. Ivan Rilski”, 1700 Sofia; E-mail: kremena.arsova@mgu.bg
⁴University of Belgrade, Technical Faculty in Bor, 19210 Bor; E-mail: mstajic@tfbor.bg.ac.rs
Corresponding author: dimitar.kaykov@mgu.bg

ABSTRACT. Truck haul costs, as one of the predominant operational costs for mining and quarrying operations, are known to be heavily dependent on the design parameters of haul roads. Furthermore, in-pit haul road design parameters determine the pit limits and therefore, the potential feasibility of the mining operation. Thus, when in search of an optimal solution in terms of in-pit haul roads, one should primarily consider the location of the in-pit haul road, its design features and the deriving operational costs regarding extraction and haul costs. A suitable objective function in this case may be the undiscounted profit for the ultimate pit design. However, for each considered scenario, truck and excavator operational costs can be calculated using simulation techniques for better accuracy. Furthermore, finding an optimal solution requires the execution of a reliable and efficient algorithm, depending on the shape of the objective function. Hence, a non-linear optimisation approach was proposed in this paper for solving the in-pit haul road optimisation problem, based on a simulation of the materials allocation, which was used for calculating the objective function. Design parameters were assumed to be predetermined, while the only variable used for finding an optimal solution was the location of the in-pit haul road inside the pit contour. In addition, two 1-D algorithms were compared for finding the optimal solution (Search with accelerated step size and 1-D Simplex method). Furthermore, two regression models are proposed (Multiple Linear Regression – MLR and Non-Linear Regression – NLR), which could identify the more feasible region for the in-pit haul road location and reduce the number of iterations required for convergence.

Key words: in-pit haul road, open-pit mine, design parameters, non-linear optimisation, simulation

DOI: https://doi.org/10.58903/u17190831

A NON-LINEAR OPTIMISATION APPROACH TO IN-PIT HAUL ROAD DESIGN

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Plamen Georgiev, Marina Nicolova, Irena Spasova, Stoyan Groudev

University of Mining and Geology “St. Ivan Rilski”, 1700 Sofia; E-mail: ps_georgiev@mgu.bg
Corresponding author: ps_georgiev@mgu.bg

ABSTRACT. Laden leach solution, generated from bioleaching of pyrometallurgical copper slags with a mixed culture of moderately thermophilic bacteria in a bioreactor, contains several base metals (Cu, Co, Zn) and a very high concentration of iron (33,9 g/ L). Further processing of cobalt and zinc to the respective final products requires preparatory iron removal from the laden leach solution. The direct iron removal from that solution as goethite was unacceptable because of the significant co-precipitation of copper and cobalt from the solution. The main aim of this paper is to study magnetite (Fe₃O₄) synthesis as an approach for iron removal to a value-added product as a step of the processing of a laden solution generated due to the bioleaching of non-ferrous metals in a bioreactor. Ferrous iron oxidation to ferric state was efficient when the addition of H₂O₂ (30 %) was combined with maintaining the pH 3,1-3,3 with NaOH and air purging. Solvent extraction with 25 % D2EHPA and 7,5 % TBP dissolved in kerosene efficiently separated the dissolved iron and the base metals from the processed solution. However, in the presence of H₂, the iron was stripped from the organic solvent with low acid consumption. The applied precise control of the chemical precipitation and oxidation processes at 50 degrees Celsius allowed the iron content (11,7 g/ L) in the stripping solution to be removed efficiently as magnetite (Fe₃O₄). Based on the chemical content of iron, copper and sulphur, the synthesised nanoparticles of magnetite could be applicable in many sectors (steel, chemical, and electronics).

Keywords: iron, bioleaching, solvent extraction, magnetite

DOI: https://doi.org/10.58903/u17190829

IRON REMOVAL FROM LADEN BIOLEACHING SOLUTION BY PROCESSES OF SOLVENT EXTRACTION AND MAGNETITE SYNTHESIS

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Petia Genova¹, Katerina Nikolova¹, Anatoliy Angenov¹, Svetlana Bratkova¹, Nato Mirdzveli²

 ¹University of Mining and Geology “St. Ivan Rilski”, 1700 Sofia; Bulgaria
² Petre Melikishvili Institute of Physical and Organic Chemistry, I. Javakhishvili Tbilisi State University, 1086, Tbilisi, Georgia
Corresponding author: Svetlana Bratkova, E-mail: s_bratkova@mgu.bg

 ABSTRACT. One of the commonly used methods for removing sulphates from mine waters is the precipitation. The classical approach for the treatment of acid mine drainage (AMD) rich in heavy metals and sulphates at about of 2000 mg/L is based on using Ba added in different forms – Ba(Cl)₂, Ba(OH)₂, BaCO₃, BaS. In the present study, barite precipitation with the use of BaS was implemented in a laboratory installation in continuous mode. The scheme of the installation includes series-connected chemical reactors and settlers, which allows the sequential implementation of three processes – liming, barite precipitation and recarbonation. Real AMD containing high concentrations of sulphates and heavy metals has been effectively treated by the laboratory installation. The application of BaS effectively reduces the concentration of sulphates below 200 mg/L and the electrical conductivity of the treated waters is significantly reduced.

Key words: AMD, barite precipitation, sulphates, heavy metals.

DOI: https://doi.org/10.58903/u17190828

BARITE PRECIPITATION FOR TREATMENT OF MINE WATERS WITH HIGH SULPHATE CONCENTRATIONS

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Santander-Muñoz, M., Cardozo-Castillo, P. & Valderrama-Campusano L. (2021). Removal of sulphate ions by precipitation and flotation. Ingenieria e Investigacion, 41(3), (e90349). https://doi.org/10.15446/ing.investig.v41n3.90349

Spaldon, T., Hanculak, J., Sestinova, O., Findorakova L.&  Fedorova E. (2017). Barium use for sulphates eemoval at various pH Values. Inzynieria Mineralna, (1), 65-69. DOI: 10.29227/IM-2017-01-12

Fîță Nicolae Daniel¹, Stănilă Daniela Sorina², Păsculescu Dragoș³, Lazăr Teodora⁴, Popescu Florin Gabriel⁵,  Mureșan-Grecu Florin⁶

¹University of Petroșani, 332006 Petroșani; E-mail: daniel.fita@yahoo.com
²University of Petroșani, 332006 Petroșani; E-mail: sorina_stanila@yahoo.com
³University of Petroșani, 332006 Petroșani; E-mail: pdragos_74@yahoo.com
⁴University of Petroșani, 332006 Petroșani; E-mail: teomititica@yahoo.com
⁵University of Petroșani, 332006 Petroșani; E-mail: floringabriel82@yahoo.com
⁶University of Petroșani, 332006 Petroșani; E-mail: flomavon2002@yahoo.com
Corresponding author: daniel.fita@yahoo.com

ABSTRACT. The need for analysis of the nuclear subsector, which generates critical nuclear infrastructure, comes in the context in which the possible occurrence of non-supply cases with uranium raw materials, nuclear fuels and nuclear electricity, could generate major issues of national interest, with European and NATO implications. The authors consider that addressing the uranium mining subsector is a strict national security issue because the lack of nuclear raw materials, their prefabricated materials or nuclear electricity can cause enormous damage to domestic consumers, industry and the national economy, which are dependent on electricity.

Key words: uranium mining subsector, ensuring energy security

DOI: https://doi.org/10.58903/u17190827

STRUCTURE AND ANALYSIS OF THE URANIUM MINING SUBSECTOR IN THE CONTEXT OF ENSURING OF ROMANIAN ENERGY SECURITY

References

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Wu Y., Chen Z., Wang Z., Chen, S., Ge, D., Chen, C., Jia, J., Li, Y., Jin, M.,  Zhou, T., Wang, F., & Hu. L. (2019). Nuclear safety in the unexpected second nuclear era,  Proceedings of the National Academy of Sciences – USA,   116(36): 17673–17682. doi: 10.1073/pnas.1820007116

O.V. Fedoskina, M.M. Yerisov, V.O. Fedoskin

 Dnipro University of Technology, Dnipro, Ukraine. Emails: erisov@ukr.net, fedoskin.va@ukr.net

Corresponding author: fedoskina.ev@gmail.com

 ABSTRACT. An innovative method of vibro-impact grinding of geological samples, implemented in a vibrating jaw crusher with an inclined crushing chamber, is considered to obtain a product of -1 mm in one crushing cycle. The technique consisted in comparing the results of crushing quartzite and magnetite with a particle size of 60…80 mm according to the existing multi-stage technology using jaw and roller crushers, as well as the proposed single-stage technology using a vibrating jaw crusher. Three technological schemes for the preparation of samples of quartzite and magnetite were modelled with obtaining granulometric characteristics after each piece of equipment. The analysis of the results showed almost the same particle size distribution of the samples according to the multi-stage scheme: jaw crusher, screening -2mm, roller crusher, screening -1mm and single-stage: vibrating jaw crusher, screening -1mm. The output of the finished material was 80%. The studies substantiated the feasibility of creating a small-sized vibrating jaw crusher with a crushing ratio of i ≥ 100 for the preparation of geological samples, operating in an open cycle and replacing at least two pieces of crushing equipment, two screens and mounting elements, which significantly reduces the metal consumption of the structure, the occupied area and simplifies maintenance.

Key words: vibratory jaw crusher, grinding, geological sample, sample preparation, degree of crushing

DOI: https://doi.org/10.58903/u17190826

FEATURES OF VIBRATION CRUSHING OF GEOLOGICAL SAMPLES OF MATERIAL

References

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Sidor, J., & Mazur, M. (2013). Zastosowanie kruszarki wibracyjnej w procesach bardzo drobnego kruszenia surowców mineralnych i przemysłowych odpadów ceramicznych [The use of a vibratory crusher in processes of very fine crushing of raw materials and industrial waste ceramics]. Ceramic Materials, 65(1), 71-75 (in Poland). https://journals.indexcopernicus.com/search/article?articleId=1183014

Sidor, J., & Mazur, M. (2014). Badania procesu rozdrabniania kryształu górskiego w wibracyjnej kruszarki [Examination of crushing rock crystal in a vibratory jaw crusher]. Ceramic Materials, 66(1), 32-36 (in Poland). https://journals.indexcopernicus.com/search/article?articleId=1176611

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Alexander Brodt

MLTS Group of Kairos Development International Inc., 31 Oakland Av. Pontiac, MI 48324 USA, E-mail: alexander.brodt@gmail.com

ABSTRACT. Existing coal hydro-transport technologies require preliminary grinding of coal into powder. The same circumstance prevents the use of pipeline transport for the delivery of granite, limestone and other building materials from mining sites to the consumer. With an increase in the density of the carrier medium it becomes possible to supply through the pipeline coal and other solid materials in lumpy form. After the complete regeneration of the carrier medium, the delivered coal or lump material in such a water-salt liquid is no different from that transported by rail. The regenerated working liquid is completely returned to the head of the process.

Key words: hydro-transport, water-salt heavy liquid, pipeline

DOI: https://doi.org/10.58903/u17190824

INCREASE IN THE DENSITY OF CARRIER MEDIUM AS A WAY TO CREATE HYDROTRANSPORT OF MINERALS IN LARGE LUMP FORM

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Velichka Arahangelova¹, Alexandre Loukanov^1,2

 ¹ Laboratory of Engineering NanoBiotechnology, Department of Eng. Geoecology, University of Mining and Geology “St. Ivan Rilski” – Sofia, Bulgaria, E-mails: w.mitova@abv.bg, a.loukanov@mgu.bg
² Department of Chemistry and Materials Science, National Institute of Technology, Gunma College, 580 Toriba, Maebashi, Gunma 371-8530 Japan, E-mails: loukanov@gunma-ct.ac.jp

ABSTRACT. The bioaccumulation and environmental toxicity of colloidal contaminants have always been the focus of extensive research. Here we report efficient extraction of iron oxide colloidal contaminants from mine drainage effluents by phytoremediation with legume plants. The smallest fine particles with size less than 10 nm exhibit two wide absorption peaks at 350 and 495 nm, respectively. They have good dispersibility in aqueous environment and are highly resistant to removing or purification by any gravitational settings. The ultra-small nanosized particles (with average diameter 2-3 nm) can be bioaccumulated into the roots of soybean sprouts and might cause physiological stress and inhibition of the germination process. All experimental data found delayed growth, as well as decreased biomass production, which was observed in both the stem and root system of treated sprouts. Nevertheless, the immersed in mine effluent plants showed some resistance to the colloid toxicity. The light microscopic analysis also revealed the occurrence of more intensive symbiosis between the root tubers and the rhizosphere microbial communities in the case of phytorenmediation. The absorbance spectroscopic measurement demonstrated about 90 % efficient colloidal removement from the suspension within 10 days treatment. The atomic absorption spectroscopy analysis of mineralised sprouts cultured in synthetic mine effluents found that the highest concentration of accumulated iron in the legume plants was 258,02 ± 23,48 mg/100 g, which was achieved in suspension of 25 mM FeSO₄. The presented report enables potential practical application of legume plants in the circumneutral passive treatment systems for remediation of mine effluents.

Key words: Mine effluents, colloidal contaminants, bioaccumulation, circumneutral passive treatment systems

DOI: https://doi.org/10.58903/u17190823

PHYTOREMEDIATION AND EXTRACTION OF COLLOIDAL CONTAMINANTS FROM MINE EFFLUENTS THROUGH LEGUME PLANTS

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