Journal
RESOURCES CONSERVATION AND RECYCLING
Volume 196, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.resconrec.2023.107035
Keywords
Industrial wastewater; Resource recovery; Nanofiltration; Molybdenum trioxide; Sustainable technology; Circular economy
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An experimental investigation successfully recovered and recycled 96.5% of molybdenum from industrial wastewater using a novel membrane-integrated hybrid technology. The wastewater volume was reduced by 94%, and molybdenum concentration was increased from 1.32 g/L to 10.2 g/L. The molybdenum was efficiently recovered as ammonium molybdate and further converted into high-purity MoO3 through chemical precipitation and thermal decomposition.
An experimental investigation was conducted to recover and recycle a precious metal (molybdenum) while treating industrial wastewater using a novel membrane-integrated hybrid technology. Hollow-fiber crossflow modules containing ultrafiltration and nanofiltration membranes in the recirculation mode successfully separated 96.5% of the molybdenum from industrial wastewater. The volume of feed wastewater (250 L) was reduced by -94%, and the molybdenum concentration was increased from 1.32 to 10.2 g/L using a VNF-1 membrane for its smooth recovery (98.7%) as ammonium molybdate by chemical precipitation under response-surfaceoptimized conditions of critical parameters of NH4+/Mo ratio (1.32), pH (1.7), temperature (62 degrees C), and time (15.7 h). Further, ammonium molybdate was converted into MoO3 of high purity (99.4%) using thermal decomposition at 500 degrees C for 30 min. This is the first proof-of-concept demonstrating the use of a membrane system to recover molybdenum from industrial wastewater to promote a circular economy for recycling and regenerating valuable resources.
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