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Abstract

There is often a need to improve the taste of mineral water by reducing the sulphate ion content. It was found that for such an effect, nanofiltration (NF) process can be used. In the case, the proposed formula was assumed obtaining a mineral water with reduction of H2S and SO42- content through the following processes: stripping - UF/MF or rapid fi ltration - nanofiltration - mixing with raw water or filtration through calcium bed. The paper shows the results of the tests, with use of mineral waters and nanofiltration. Commercial nanofiltration membranes NF-270 Dow Filmtec and NF-DK GE Infrastructure Water&Process Technologies were applied. NF was carried out for mixed water from both water intakes (1 and 2), recovery of 50%, at transmembrane pressure of 0.8-1.2 MPa in the dead-end fi ltration mode. In addition, the permeate obtained in NF was filtered through a column fi lled with 1.0-3.0 mm limestone rock, in order to improve the composition of mineral water. The tested mineral water is the sulphate-chloride-sodium-calcium-magnesium in nature and contains 991 mg/L of SO42- and 2398 mg/L of TDS, while the permeate after NF showed the chloride - sodium hydrogeochemical type (TDS: 780-1470 mg/L, sulfate 10-202.7 mg/L, calcium 23-39.7 mg/L, magnesium 11-28 mg/L). As a result of water treatment in the NF process, high reduction of SO42- ions was obtained (79-98.7%), while the TDS was reduced in 51-64%. Because the process of NF allows for relatively high reduction of bivalent ions, a significant reduction in calcium ion content (84-88%) and magnesium (84-89%) has been also obtained. Monovalent ions were reduced to a lesser extent, i.e. sodium in 46% and bicarbonates in 39-64.1%. Despite obtaining the positive effect of the sulphate ions content reduction, the NF process significantly changed the mineralogy composition of water. The permeate filtration (DK-NF membrane) on the CaCO3 deposit led to a correction of the hydrogeochemical type of water from chloridesodium to chloride-bicarbonate-sodium. The concentration of calcium ions was increased by 60.5% and was 28.2 mg/L, and bicarbonate ions by 7.78% (increased to 195 mg/L). Based on a morphological assessment of the deposits in the SEM image and their chemical composition, the presence of gypsum crystals was detected on the surface of the NF-270 membrane. The deposits formed on the NF-DK membrane were of a completely different character as aggregations of iron and aluminium oxides/hydroxides were found. Such significant mineralogical differences between the secondary deposits crystallising on the surface of the membranes point to the impact of several factors, including membrane characteristics, concentration polarisation, mass transport mechanisms, etc.

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Authors and Affiliations

Michał Bodzek
Mariola Rajca
Barbara Tomaszewska
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Abstract

Waters with mineralization above 1000 mg/dm3, classified as mineral waters, are exploited in many regions of Poland. Their resources are usually not renewable and their excessive exploitation can lead to the deterioration of their physical and chemical properties and negatively affect their quantitative status.

The stages in the life of a groundwater deposit involve prospecting, exploration, development, and exploitation. Deposit management is the basis for a sustainable and economically successful process of using water resources.

The problem of effective management of mineral water deposit management has not been raised so far, which is why the authors decided to address issues that should be taken into account in the abovementioned process. An integrated approach to the prospecting, exploration, opening, and exploitation of mineral waters combining the knowledge of specialists from various disciplines (hydrogeologists, geologists, drillers and producers) will enable the appropriate management of these resources.

The article describes the basic elements of the process, special attention has been paid to the mineral water deposit development plan conditioning the correct and economically justified exploitation of these waters. This plan should take the development strategy and legal and environmental conditions into account. Hydrogeological and mathematical models of mineral water deposits developed as part of the plan provide the basis for determining the extent of the mining area and estimating water resources. The deposit opening, exploitation, and monitoring methods are important elements of the deposit development plan.

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Authors and Affiliations

Barbara Uliasz-Misiak
ORCID: ORCID
Elżbieta Wojna-Dyląg
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Abstract

A method to improve the quality of purifi ed water, reduce the cost of reagents for the regeneration of resin and create low-waste processes have been developed. This paper presents the results of ion exchange separation of sulfates and nitrates using AV-17-8 anion exchange resin in NO3 form. The effi ciency of anion separation on the highly basic anion exchange resin AV-17-8 depends on the magnitude and ratio of their concentrations in water. Separation on the AV-17-8 anion exchange resin has been shown to be eff ective at concentrations of sulfates up to 800 mg/dm3 and nitrates up to 100 mg/dm3. Conditions for regeneration of 10% NaNO3 anion exchange resin were determined. Reagent precipitation of sulfates from the used regeneration solution in the form of calcium sulfate was carried out. Calcium sulfate precipitate can be used in the manufacturing of building materials. The regeneration solution is suitable for reuse. The developed results will allow to introduce low-waste desalination technology of highly mineralized waters.
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Authors and Affiliations

Inna Trus
1
ORCID: ORCID
Mukola Gomelya
1
ORCID: ORCID
Viktoria Vorobyova
1
ORCID: ORCID
Margarita Skіba
2
ORCID: ORCID

  1. National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Kyiv, Ukraine
  2. Ukrainian State Chemical-Engineering University, Dnipro, Ukraine

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