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Removal of Microplastics using Ground Granulated Blast Furnace Slag
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Lab tests mixed polyethylene microplastic particles with ground granulated blast furnace slag, a leftover material from steelmaking, in water samples. Adding more slag reduced microplastic levels in the water, while larger microplastic particles were harder to remove. Researchers concluded the slag shows potential for microplastic removal but said more research is needed.
In this study, microplastic removal using ground granulated blast furnace slag was investigated.Blast furnace slag is a waste material that requires sustainable disposal or reuse alternatives.Microplastics of polyethylene have been the focus of this study.Batch adsorption experiments were conducted to evaluate the ability of ground-granulated blast furnace slag to adsorb and remove microplastics from water.Primary microplastic particles were procured in different sizes and colors for this study to ensure quality control.Experiments were conducted with 2, 4, 6, 8, and 10 g/L of ground granulated blast furnace slags were used in the study.All the experiments were conducted with 500 mg/L of microplastic concentrations.The experimental setups were operated on the shaker table and waited until they reached equilibrium.Standard analytical methods were used to test microplastic concentrations.Even though the experimental results indicated effective microplastic removal using ground granulated blast furnace slag, Fourier Transform Infrared Spectrometer couldn't identify and recognize the adsorption process with clarity.The experimental results indicated that an increase in the blast furnace slag decreased the microplastics concentrations.It was revealed that the increase in the microplastic size reduced the adsorptive capacity of the ground granulated blast furnace slag.The results also indicated that the freundlich isotherm model was better suited to represent the adsorption process than the Langmuir isotherm model.The study concluded that ground granulated blast furnace slag has the potential for microplastic removal from water.However, further investigation will be needed.
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