A novel membrane-integrated sustainable technology for downstream recovery of molybdenum from industrial wastewater

Ramesh Kumar, Chengjia Liu, Geon Soo Ha, Kwang Ho Kim, Sankha Chakrabortty, Suraj K. Tripathy, Young Kwon Park, Moonis Ali Khan, Krishna Kumar Yadav, Marina M.S. Cabral-Pinto, Byong Hun Jeon

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

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-surface-optimized conditions of critical parameters of NH4+/Mo ratio (1.32), pH (1.7), temperature (62 °C), and time (15.7 h). Further, ammonium molybdate was converted into MoO3 of high purity (99.4%) using thermal decomposition at 500 °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.

Original languageEnglish
Article number107035
JournalResources, Conservation and Recycling
Volume196
DOIs
StatePublished - Sep 2023

Keywords

  • Circular economy
  • Industrial wastewater
  • Molybdenum trioxide
  • Nanofiltration
  • Resource recovery
  • Sustainable technology

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