title: Microbubble enhanced ozonation process for advanced treatment of wastewater produced in acrylic fiber manufacturing industry.
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 3.9×10(5) 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.
authors: Department of Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China. Electronic address: skytal_03@sina.com.
authors: Tianlong
authors: T
authors: Zheng
authors: Department of Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China; Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China. Electronic address: wangqh59@sina.com.
authors: Qunhui
authors: Q
authors: Wang
authors: Water Desalination and Reuse Center, King Abdullah University of Science and Technology, Thuwal 4700, Saudi Arabia. Electronic address: tao.zhang@kaust.edu.sa.
authors: Tao
authors: T
authors: Zhang
authors: School of Earth and Environmental Sciences, The University of Adelaide, South Australia 5005, Australia. Electronic address: zhining.shi.career@gmail.com.
authors: Zhining
authors: Z
authors: Shi
authors: Department of Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China. Electronic address: tianli5921@126.com.
authors: Yanli
authors: Y
authors: Tian
authors: Department of Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China. Electronic address: shishanshan727@gmail.com.
authors: Shanshan
authors: S
authors: Shi
authors: School of Earth and Environmental Sciences, The University of Adelaide, South Australia 5005, Australia. Electronic address: NSmale@bionicsinstitute.org.
authors: Nicholas
authors: N
authors: Smale
authors: Department of Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China. Electronic address: pizi0909@163.com.
authors: Juan
authors: J
authors: Wang
mesh_terms: D000180:Acrylic Resins; D066192:Manufacturing Industry; D045423:Microbubbles; D010126:Ozone / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; D010126:Ozone; D062065:Wastewater
keywords: Acrylic fiber manufacturing wastewater; Advanced treatment; Macrobubble-ozonation; Microbubble-ozonation