Microbubble enhanced ozonation process for advanced treatment of wastewater produced in acrylic fiber manufacturing industry

Tianlong Zheng, Qunhui Wang, Tao Zhang, Zhining Shi, Yanli Tian, Shanshan Shi, Nicholas Smale, Juan Wang

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

This work investigated microbubble-ozonation for the treatment of a refractory wet-spun acrylic fiber wastewater in comparison to macrobubble-ozonation. CODcr, NH3-N, and UV254 of the wastewater were removed by 42%, 21%, and 42%, respectively in the microbubble-ozonation, being 25%, 9%, and 35% higher than the removal rates achieved by macrobubble-ozonation at the same ozone dose. The microbubbles (with average diameter of 45μm) had a high concentration of 3.9×105 counts/mL at a gas flow rate of 0.5L/min. The gas holdup, total ozone mass-transfer coefficient, and average ozone utilization efficiency in the microbubble-ozonation were 6.6, 2.2, and 1.5 times higher than those of the macrobubble-ozonation. Greater generation of hydroxyl radicals and a higher zeta potential of the bubbles were also observed in the microbubble ozonation process. The biodegradability of the wastewater was also significantly improved by microbubble-ozonation, which was ascribed to the enhanced degradation of alkanes, aromatic compounds, and the many other bio-refractory organic compounds in the wastewater. Microbubble-ozonation can thus be a more effective treatment process than traditional macrobubble-ozonation for refractory wastewater produced by the acrylic fiber manufacturing industry.
Original languageEnglish (US)
Pages (from-to)412-420
Number of pages9
JournalJournal of Hazardous Materials
Volume287
DOIs
StatePublished - Feb 2 2015

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Environmental Engineering
  • Health, Toxicology and Mutagenesis
  • Waste Management and Disposal

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