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Applying Nanofiltration to Decrease Energy Consumption and Sensitivity toward Feed Composition Fluctuations in Salt

Marian Turek¹, Krzysztof Mitko¹, Paweł Skóra¹

¹Department of Inorganic, Analytical Chemistry and Electrochemistry, Faculty of Chemistry, Silesian University of Technology, ul. B. Krzywoustego 6, 44-122 Gliwice, Poland.

|May 24, 2024

Summary

This study models coal mine brine treatment using Zakład Odsalania Dębieńsko (ZOD) technology. Nanofiltration pretreatment significantly reduces energy consumption and improves salt production stability.

Keywords:

coal mine water evaporated salt production nanofiltration

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Area of Science:

Environmental Engineering
Chemical Engineering
Industrial Chemistry

Background:

Coal mine brines pose disposal challenges and represent a potential resource.
Current industrial-scale ZOD technology for brine treatment is energy-intensive.
ZOD technology utilizes mechanical vapor compression evaporators for salt production.

Purpose of the Study:

To model the energy consumption of ZOD technology for 'Ziemowit-650' coal mine brine.
To evaluate the impact of nanofiltration pretreatment on ZOD technology's energy efficiency and stability.
To assess the sensitivity of ZOD technology to variations in brine composition.

Main Methods:

Mathematical modeling of ZOD technology.
Bench-scale nanofiltration of coal mine brine.
Energy consumption estimation for two treatment scenarios.
Sensitivity analysis of key ion concentrations (Cl-, SO42-, Mg2+, Ca2+).

Main Results:

Nanofiltration pretreatment significantly reduces the energy required per ton of salt produced.
The ZOD technology becomes less sensitive to fluctuations in feed brine composition after nanofiltration.
Modeled energy consumption was estimated for direct ZOD treatment and ZOD treatment of nanofiltration permeate.

Conclusions:

Nanofiltration is a viable pretreatment method to enhance the efficiency of ZOD technology for coal mine brine treatment.
Pretreatment improves the economic feasibility and operational stability of salt production from coal mine brines.
Optimizing brine treatment processes is crucial for sustainable resource management in mining operations.