scholarly journals Improvement of Adsorption-Ion-Exchange Processes for Waste and Mine Water Purification

2019 ◽  
Vol 13 (3) ◽  
pp. 372-376 ◽  
Author(s):  
Myroslav Malovanyy ◽  
◽  
Kateryna Petrushka ◽  
Ihor Petrushka ◽  
◽  
...  
Keyword(s):  
Ion Exchange ◽  
Water Purification ◽  
Mine Water ◽  
Exchange Processes

Sorption and Membrane Technologies for Mine Water Purification

2019 ◽  
Vol 946 ◽  
pp. 621-627
Author(s):  
Konstantin L. Timofeev ◽  
Vasilii Kurdiumov ◽  
Gennady Maltsev
Keyword(s):  
Ion Exchange ◽  
Reverse Osmosis ◽  
Water Purification ◽  
Mine Water ◽  
Large Scale ◽  
Potable Water ◽  
Water Hardness ◽  
Membrane Technologies ◽  
Large Scale Tests

The importance of the research is due to the lack of potable water (~1.6 million m3 per year) in a rapidly developing city in the Urals. One way to solve this problem is to purify water from the spent copper mine with a debit of ~4.4 million m3 of water per year. The most advanced techniques recently used for obtaining drinking water of a high quality are based on ion exchange and reverse osmosis, which can ensure an obtainment of water with initial contents of impurities much below the maximum permissible values. Based on the real experience the article compares sorption and membrane technologies in terms of water purification efficiency and cost of potable water production. The large-scale tests of mine water purification were carried out at sorption and reverse osmosis pilot plants with the capacity of 1 m3 per hour for the incoming flow. The source water had the following composition, mg/dm3: 0.5–0.9 Mn; 1.0–1.7 Ni; 80-140 Ca; 30-40 Na; 40-70 Mg; 0.2–0.6 Cu; 8.1–9.5 Si; 0.01–0.03 Zn; 0.01–1.70 Fe; <0.01 Al; < 0.005 As; < 0.005 Pb. At the same time the salinity was 640–680 mg/dm3, the water hardness was 9.5–11.5 mmol/dm3 and pH was 7.0-7.5. The content of non-mentioned impurities was below the detection limit. The resulting treated water met the requirements for the quality of potable water for both purification techniques. It was concluded, that the best option for treatment of mine water is ion exchange.

scholarly journals Modeling of Ion Exchange Processes to Optimize Metal Removal from Complex Mine Water Matrices

Water ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3109
Author(s):  
Angela Isabel Pedregal Montes ◽  
Janith Abeywickrama ◽  
Nils Hoth ◽  
Marlies Grimmer ◽  
Carsten Drebenstedt
Keyword(s):  
Ion Exchange ◽  
Mine Water ◽  
Reactive Transport ◽  
Metal Removal ◽  
Transport Model ◽  
Breakthrough Curves ◽  
Exchange Capacity ◽  
Operating Conditions ◽  
Mine Waters ◽  
Exchange Processes

The modeling of ion exchange processes could significantly enhance their applicability in mine water treatment, as the modern synthetic resins give unique advantages for the removal of metals. Accurate modeling improves the predictability of the process, minimizing the time and costs involved in laboratory column testing. However, to date, the development and boundary conditions of such ion exchange systems with complex mine waters are rarely studied and poorly understood. A representative ion exchange model requires the definition of accurate parameters and coefficients. Therefore, theoretical coefficients estimated from natural exchange materials that are available in geochemical databases often need to be modified. A 1D reactive transport model was developed based on PhreeqC code, using three case scenarios of synthetic mine waters and varying the operating conditions. The first approach was defined with default exchange coefficients from the phreeqc.dat database to identify and study the main parameters and coefficients that govern the model: cation exchange capacity, exchange coefficients, and activity coefficients. Then, these values were adjusted through iterative calibration until a good approximation between experimental and simulation breakthrough curves was achieved. This study proposes a suitable methodology and challenges for modeling the removal of metals from complex mine waters using synthetic ion exchange resins.

scholarly journals Theoretical Modelling of Ion Exchange Processes in Glass: Advances and Challenges

2021 ◽  
Vol 11 (11) ◽  
pp. 5070
Author(s):  
Xesús Prieto-Blanco ◽  
Carlos Montero-Orille
Keyword(s):  
Ion Exchange ◽  
Diffusion Coefficients ◽  
Molten Salts ◽  
Theoretical Modelling ◽  
Copper Films ◽  
Theoretical Frameworks ◽  
Self Diffusion ◽  
Exchange Processes ◽  
The One ◽  
Made In

In the last few years, some advances have been made in the theoretical modelling of ion exchange processes in glass. On the one hand, the equations that describe the evolution of the cation concentration were rewritten in a more rigorous manner. This was made into two theoretical frameworks. In the first one, the self-diffusion coefficients were assumed to be constant, whereas, in the second one, a more realistic cation behaviour was considered by taking into account the so-called mixed ion effect. Along with these equations, the boundary conditions for the usual ion exchange processes from molten salts, silver and copper films and metallic cathodes were accordingly established. On the other hand, the modelling of some ion exchange processes that have attracted a great deal of attention in recent years, including glass poling, electro-diffusion of multivalent metals and the formation/dissolution of silver nanoparticles, has been addressed. In such processes, the usual approximations that are made in ion exchange modelling are not always valid. An overview of the progress made and the remaining challenges in the modelling of these unique processes is provided at the end of this review.

Ion exchange processes in aqueous-organic media

1969 ◽  
Vol 41 (14) ◽  
pp. 2047-2050 ◽  
Author(s):  
J. L. Pauley ◽  
D. D. Vietti ◽  
C. C. Ou-Yang ◽  
D. A. Wood ◽  
R. D. Sherrill
Keyword(s):  
Ion Exchange ◽  
Organic Media ◽  
Exchange Processes

scholarly journals Chemical composition of groundwaters in the Hornsund region, southern Spitsbergen

2012 ◽  
Vol 44 (1) ◽  
pp. 117-130 ◽  
Author(s):  
Tomasz Olichwer ◽  
Robert Tarka ◽  
Magdalena Modelska
Keyword(s):  
Chemical Composition ◽  
Ion Exchange ◽  
Shallow Groundwater ◽  
Mineralogical Composition ◽  
Deep Groundwater ◽  
Exchange Processes ◽  
Groundwater Circulation ◽  
Initial Chemical Composition ◽  
The University ◽  
Intermediate System

Chemical composition of groundwaters was investigated in the region of the Hornsund fjord (southern Spitsbergen). The investigations were conducted during polar expeditions organized by the University of Wroclaw in two summer seasons of 2003 and 2006. Three zones of groundwater circulation: suprapermafrost, intrapermafrost and subpermafrost, were identified in areas of perennial permafrost in the region of Hornsund. The zone of shallow circulation occurs in non-glaciated (suprapermafrost) and subglacial areas. In this zone, the chemical composition of groundwater originates from initial chemical composition of precipitation, mineralogical composition of bedrock, oxidation of sulphides and dissolution of carbonates. The intermediate system of circulation is connected with water flow inside and below perennial permafrost (intrapermafrost and subpermafrost). In this zone, the chemical composition of groundwater is mainly controlled by dissolution of carbonates, ion exchange processes involving Ca2+ substitution by Na+, and oxidation of sulphides under oxygen-depleted conditions. The subpermafrost zone (deep groundwater circulation) occurs in deep-tectonic fractures, which are likely conduits for the descent of shallow groundwater to deeper depths. In this zone, the groundwater shows lower mineralization comparing to intrapermafrost zone and has a multi-ion nature Cl–HCO3–Na-Ca–Mg.

scholarly journals Studies of factors affecting stability and efficiency of anion exchanger

2020 ◽  
Vol 177 ◽  
pp. 03020
Author(s):  
Nigora Mukhtarova ◽  
Bakhodir Aliev ◽  
Sadritdin Turabdzhanov ◽  
Latofat Rakhimova
Keyword(s):  
Ion Exchange ◽  
Anion Exchanger ◽  
Analytical Data ◽  
Polycondensation Reaction ◽  
Water And Wastewater Treatment ◽  
Factors Affecting ◽  
Exchange Processes ◽  
Physicochemical Factors ◽  
Swelling Capacity ◽  
Water And Wastewater

Various industries such as mining and the chemical industry are one of the most used ion exchange processes for water and wastewater treatment. The first section of this work presents the mechanism of the polycondensation reaction to obtain the polymer matrix of anion exchanger. Elemental analytical data conformed that anion exchanger holds 34,99% of nitrogen atoms and 44,47% oxygen atoms in the structure. In addition to the synthesis of the anion exchanger, physicochemical factors have a significant effect. The temperature of reactions for a certain time using a Lewis catalyst, the choice of the optimal solvent for improving swelling capacity of the starting monomers, due to their advantages as effective materials at a low price, are described in the second section. The information in the last section of the paper is devoted to the sorption properties and the ion-exchange processes in where the obtained anion exchanger was studied and used.

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