Intelligent Mine Water Management Advanced solutions for nowadays challenges iminewa 1.1.2014 31.12.2018 Tampere Vesi ja emissioseminaari 20 21.05.2015 Professor Mika Sillanpää Head of Professor Christian Wolkersdorfer (FiDiPro) PhD students: Daniela Lopes Phuong Nguyen Elham Nariyan Evgenia Iakovleva
Intelligent Mine Water Management User need Water and waste minimization in mining and exploration Lower investment cost to mining, exploration and mine water management Solution To enhance mine water management Reuse of extracted valuables The mine water treatment inside a mine Optimization of geothermal mine water applications Valorization of mine water Benefits Lower environmental impacts due to optimized mining and exploration processes Users Mining and exploration companies Research institutes Chemical reagents and process equipment manufacturers
Solutions and challenges Nitrogenous compounds with further using them as a fertilizer Production of Struvite (MgNH 4 PO 4.6H 2 O) and Niter (KNO 3 ) Electro remeditation of sulphates The reduction of NO 3- to NH 4+ by iron wastes The passivation process decreasing during the sulphates removal by electro remediation The sulphates removal by electrocoagulation Optimizing tracer tests for mine water Tracer quantification method New tracer development Quantification method is currently time and labour consuming, and also is a sensitivity method, especially for fluorescent microspheres Unstable tracer: recovery rate is low due to ph, temperature, sediment adsorption, and other impact factors
Approach Nitrogenous compounds removal from mine water Mine water characterization from several mine sites in order to find the highest NO 3- -concentration Aim of the research Transformation of an environmental issue into something useful attempt to produce a fertilizer from NO 3- present in the mine water
Nitrogenous compounds removal from mine water Use of iron nanoparticles in comparison with an iron waste for NO 3- reduction to NH 4 + Stream wastes rich in PO 4 3- and Mg 2+ will be used to precipitate Struvite (fertilizer) from mine water Expectations Removing nitrate from mine water in a more sustainable way Besides Struvite production, other fertilizeres will be taken into consideration (e.g. KNO 3 ) according to their economic feasibility to create a fertilizer with economical interest
Nitrogenous compounds removal from mine water Param Water Param Water Param Water ph 7.80 PO 4 3-0.03 Al < 0.01 EC (µs/cm) Redox (mv) DO (mg/l) TDS 1057 NO 3-150 Ba 0.091 200 Mg 2+ 19 Co 0.00077 10.20 Ca 2+ 100 Mn 0.015 760 K + 65 Mo 0.0058 (mg/l) Fe Tot 0.06 Na + 76 Ni < 0.001 Fe 2+ 0.02 SO 2-4 200 Si 5.60 NH 3 3.33 Cl 30 Se < 0.001 NH + 4 3.50 F 1.10 Others <0.001 NO 4Fe 10H 4Fe NH 3H O 0 2 3 4 2 nzvi slurry ph 2 Anoxic conditions 30.5 g/l of nzvi 94.9% of NO 3 - removal 7
Approach Sulphate electromediation Mine water sampling in several Finnish mine sites Optimizing gap between electrodes for avoiding passivation process Choosing of catalisators for coagulation process
Sulphate removal by electrocoagulation Main aim Avoid passivation of electrocoagulation process to increase its efficiency for metal and sulfate removal Solution Using LED lamp and hydrogen peroxide to produce peroxicoagulation and pseudo-peroxi coagulation process Expectations Passivation will not occur in long period of time compared with electrocoagulation process and energy consumption will be much lesser
a a a b V=9.05 v, I=2A, P= 18.1 w V=0.81 v, I= 2 A, P=1.62 w
Approach Optimizing tracer tests for mine water Studying geochemistry and hydrogeology of an abandoned underground mine in Finland Conducting a tracer test with fluorescent microspheres for the abandoned underground mine, including planning, injection, sampling and quantification for a tracer test Optimizing fluorescent microspheres tracers quantification through the dye extraction method by dissolving in a organic solvent and measuring fluorescent intensity to quantify fluorescent microspheres tracers Studying new tracer for mine water, especially a DNA tracer
Approach Optimizing tracer tests for mine water The main aim is the improvement of a tracer test for an abandoned underground mine for hydrodynamic and geothermal studying The solution is focused on optimization of tracer quantification and new tracer development The expectations are fluorescent microspheres tracer quantification procedure in the optimal conditions conducting tracer test for an abandoned underground mine in Finland DNA tracer feasibility studying for mine water
Optimizing tracer tests for mine water
Publications Removal of nitrogenous compounds from mine water Nitrate reduction from a real mine water with an iron waste Review on the removal of nitrogenous compounds from mine water Studies on the struvite production from mine water Struvite fertilizer production from a real mine water by using wastes as raw materials Production of niter fertilizer from real mine water
Publications Removal of sulphate from mine water Electrocoagulation assisted fenton (photo fenton process) with LED lamp (EC,LED, in-situ and ex-situ H 2 O 2 ) Production of ferrate (VI) for removal of metals of mine water and investigating about their magnetic properties Effect of acidic and basic solution for removing metals by ferrates Investigating of removing simultaneously metals and sulfate from mine water by barium ferrate BaFeO 4 Producing H 2 SO 4 assisted BDD with membrane
Publications Optimizing tracer tests for mine water Optimizing dye extraction method for tracer quantification Optimizing tracer tests for an abandoned underground mine in Finland with different fluorescent microspheres Feasibility study of DNA tracer for mine water Comparison of fluorescent microspheres and DNA tracers behavior for mine water Optimizing DNA tracer tests for an abandoned underground mine in Finland
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