Effect of salinity on air dissolution, size distribution of microbubbles, and hydrodynamics of a dissolved air flotation (DAF) system

Fanaie, Vahid Reza; Khiadani, Mehdi

doi:10.1016/j.colsurfa.2020.124547

Cited by 30 publications

(9 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Increased viscosity in this case is due to the addition of sodium salt whereby the inorganic Na + ions of high surface charge density may be capable of holding enough water molecules around them to increase the overall amount of structured water, even reducing the electrostatic repulsion between PFAS molecules leading to a decrease in CMC and improved foam formation (Michaux et al, 2018). The increased viscosity also results in decreased bubble size which would increase the total bubble surface area available (Fanaie & Khiadani, 2020) for PFAS attachment for a constant air flowrate. In addition to conductivity, the increase in removal efficiency may also have been affected by the differing initial PFAS concentrations, especially for the two runs with the highest removal efficiency which had the greatest total PFAS concentrations.…”

Section: Effect Of Conductivitymentioning

confidence: 99%

Foam fractionation removal of multiple per‐ and polyfluoroalkyl substances from landfill leachate

McCleaf¹,

Kjellgren

Ahrens

2021

AWWA Water Science

View full text Add to dashboard Cite

Per-and polyfluoroalkyl substances (PFAS) are a common contaminant in municipal landfill leachate and are recognized as a pollutant on global scale.The present work examined foam fractionation (FF) in batch and continuous modes as an appropriate treatment technique for PFAS removal for the landfill leachate and found stable removal efficiency of greater than 90% for PFOA (C 7 ), PFOS (C 8 ), PFHxS (C 6 ), and PFHpA (C 6 ) and 6:2 FTSA (C 6 ). For other PFAS such as PFNA (C 8 ), PFPeS (C 4 ), PFHxA (C 5 ), PFHpS (C 7 ), and PFBS (C 4 ), a less stable removal between 80% and 50% was achieved while between 50% and 20% removal was observed for EtFOSAA (C 8 ), PFBA (C 3 ), PFDA (C 9 ), FOSA (C 8 ), PFPeA (C 4 ), and MeFOSAA (C 8 ). Increased air flowrate, addition of iron (III) oxide (Fe +3 ) coagulant, conductivity, and greater untreated leachate PFAS concentration were factors resulting in increased removal efficiency for the majority of PFAS.

show abstract

Section: Effect Of Conductivitymentioning

confidence: 99%

Foam fractionation removal of multiple per‐ and polyfluoroalkyl substances from landfill leachate

McCleaf¹,

Kjellgren

Ahrens

2021

AWWA Water Science

View full text Add to dashboard Cite

show abstract

“…Furthermore, Fanaie and Khiadani studied the effect of salinity on the size distribution of microbubbles of a dissolved air flotation system and observed a reduction from 40–250 μm (freshwater) to 20–160 μm (saline water).…”

Section: Microscopic Aspects Of Gas Flotationmentioning

confidence: 99%

Gas Flotation of Petroleum Produced Water: A Review on Status, Fundamental Aspects, and Perspectives

et al. 2020

View full text Add to dashboard Cite

Produced water is a major byproduct in oil production and the largest waste stream generated in the petroleum industry. At the Norwegian Continental Shelf, produced water is still mostly discharged to the sea, but some installations re-inject produced water into the reservoir for pressure support or disposal. Gas flotation is a separation technology widely used both onshore and offshore that generally reduces the oil concentration to <25 ppmv. It is also a promising technology for subsea water treatment. The aim of this review is to give an overview and provide a link between the industrial use and the fundamental aspects of gas flotation. The industrial analysis examines the development and design of gas flotation technologies: induced, dissolved, and compact flotation units. Several aspects of subsea water separation are also discussed. The fundamental aspects are dedicated to the fluid dynamics of bubble−droplet collisions and the phenomena involved after their encounter, i.e., film drainage, forces involved in this process, and spreading of oil on the surface of gas bubbles. Moreover, a detailed analysis of parameters that can affect gas flotation, like gas bubble and oil droplet sizes, droplet−bubble attachment mechanisms, interfacial properties, water composition, oil and gas properties, pressure, and temperature, is provided.

show abstract

“…High-speed photography studies are commonly used to perform such characterization [29]. There are various ways to process bubble images, such as with process image using software ImageJ [26,30,31], using software MATLAB [32,33], using computational fluid dynamic (CFD) [16,34], and Particle image velocimetry (PIV) [28,35,36].…”

Section: Introductionmentioning

confidence: 99%

Effect of Lens Aperture for Analysis of Bubble Image Size Microbubble Generator Aeration System

Taukhid

Trijuno

Karim

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

Investigates Microbubble characterization is an essential component of any experimental investigation of new microbubble generator design. The use of microbubble generators as aeration systems often experiences blockages. That is caused by the broad cross-section of nozzles and air holes with small diameters. The microbubble generator was redesigned by increasing the cross-sectional area and diameter of the air hole. The method of investigating the bubble process uses image capture with three aperture speeds of the lens of 1/125f, 1/160f, and 1/200f with a combined airflow rate of 0.5 Lpm, 1.5 Lpm, and 2.5 Lpm. The result was characterized with multiple lens apertures with 1/160f bubble results ranging from 5.4 - 94.3 μm at all airflow rates.

show abstract

Effect of salinity on air dissolution, size distribution of microbubbles, and hydrodynamics of a dissolved air flotation (DAF) system

Cited by 30 publications

References 54 publications

Foam fractionation removal of multiple per‐ and polyfluoroalkyl substances from landfill leachate

Foam fractionation removal of multiple per‐ and polyfluoroalkyl substances from landfill leachate

Gas Flotation of Petroleum Produced Water: A Review on Status, Fundamental Aspects, and Perspectives

Effect of Lens Aperture for Analysis of Bubble Image Size Microbubble Generator Aeration System

Contact Info

Product

Resources

About