TY - JOUR
T1 - Microbubble enhanced ozonation process for advanced treatment of wastewater produced in acrylic fiber manufacturing industry
AU - Zheng, Tianlong
AU - Wang, Qunhui
AU - Zhang, Tao
AU - Shi, Zhining
AU - Tian, Yanli
AU - Shi, Shanshan
AU - Smale, Nicholas
AU - Wang, Juan
N1 - KAUST Repository Item: Exported on 2020-10-01
PY - 2015/2/2
Y1 - 2015/2/2
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/347289
UR - http://linkinghub.elsevier.com/retrieve/pii/S0304389415000801
UR - http://www.scopus.com/inward/record.url?scp=84922454330&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2015.01.069
DO - 10.1016/j.jhazmat.2015.01.069
M3 - Article
C2 - 25681716
SN - 0304-3894
VL - 287
SP - 412
EP - 420
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -