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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
Sustainable, highly effective selenate removal using electrochlorination facility-obtained magnesium precipitate: An
Han Gyeol Jeon1, Jin-Seok Kim2, Seonggyu Choi3
1Department of Environment and Energy Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea.
Abstract:
We proposed a sustainable selenate (Se(VI)) removal method using in situ layered double hydroxide (LDH) formation and calcined magnesium precipitate (CMP) derived from an electrochlorination facility. During kinetic experiments, the optimal removal conditions were identified by adjusting pH and Al dosage, which enabled a notable Se(VI) removal efficiency (127 mg/g-CMP). The initial release of Mg ions from CMP was confirmed to occur via Al-ion hydrolysis. Subsequently, after the pH adjustment process, Se(VI) could be sequestered via outer-sphere complexation within the interlayer space of the brucite-like sheets in LDH. The reusability of precipitated sludges (LDHS and calcined LDHS (LDOS)), which can be secondary wastes, was also evaluated as Se(VI) adsorbents. The results confirmed the high maximum adsorption capacity of LDOS (42.1 mg/g), demonstrating its performance comparable to that of reported adsorbents. This study highlights the potential of the in situ LDH formation method for Se(VI) removal and the possibility of transforming magnesium precipitate into sustainable resources.
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