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

Abstract

Microbubble enhanced ozonation process for advanced treatment of wastewater produced in acrylic fiber manufacturing industry, Journal of Hazardous Materials http://dx.doi.org/10.1016/j.jhazmat. 2015.01.069 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThis work investigated microbubble-ozonation for the treatment of a refractory wet-spun acrylic fiber wastewater in comparison to macrobubble-ozonation. COD cr , NH 3 -N, and UV 254 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 45 μm) had a high concentration of 3.9 × 10 5 counts/mL at a gas flow rate of 0.5 L/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.

Separation of Pollutants from Oil-Containing Restaurant Wastewater by Novel Microbubble Air Flotation and Traditional Dissolved Air Flotation

“…In addition, the retention time of microbubbles of both processes was also investigated. According to the Stokes' law, the rising speed of bubbles which determines their retention time in the water is mainly related to the bubble size [19]. In the current study, the Stokes' law was applied to determine the rising velocity of bubbles.…”

“…Therefore, the removal efficiencies of contaminants in MAF were highly enhanced. A c c e p t e d M a n u s c r i p t 19 …”

A bibliometric analysis of micro/nano-bubble related research: current trends, present application, and future prospects

“…It is well known that micro/nano-bubbles have many more advantages, such as huge interfacial area, low bubble rising speed, pressurization dissolution capacity, charging surface, high mass transfer coefficient, high dissolution ability, and the release of hydroxyl radicals (Agarwal et al 2011;Zheng et al 2015d). Due to its unmatched superiority, micro/nano-bubbles have been widely used in various applications in many fields of science and technology.…”

“…Microbubbles with diameters ranging from a few micrometers to tens of micrometers have drawn significant attention (Zheng et al 2015d). The diameters of nanobubbles with less than 200 nm are far removed from these of microbubbles (Agarwal et al 2011).…”

Influence of microbial floatation on membrane fouling due to particles and organic matters in submerged microfiltration

“…For instance, microbubbles have high-specific surface area (the ratio of surface area to the volume), allowing the high efficiency of pollutant adhesion [7,10]. Due to its high effectiveness of pollutant removal, microbubble floatation has drawn attention for not only wastewater treatment [11][12][13] but also water purification [14,15] and pretreatment for seawater desalination [16][17][18].…”