Effects of influent physicochemical characteristics on air dissolution, bubble size and rise velocity in dissolved air flotation: A review

Rajapakse, Nalaka; Zargar, Masoumeh; Sen, Tushar Kanti; Khiadani, Mehdi

doi:10.1016/j.seppur.2022.120772

Cited by 55 publications

(10 citation statements)

References 90 publications

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“…Additionally, not all parameters which will affect removal rate in real world applications were varied. Whilst this work has already investigated the effects of MB characteristics, MP particle characteristics, salinity and surfactant concentration, studies have shown that other parameters such as influent viscosity, temperature, pH, surface tension, solid content, and organic matter will all have an effect on the MB characteristics as well as flotation performance [77][78][79]. Further work on analyzing MP removal in lab scale continuous flotation tanks with a greater range of solution types, including industrial waste streams, and further variation and measurement of parameters would aid in further understanding of real-world removal of MP particles.…”

Section: Applicability Of Experimental Methods and Image Analysismentioning

confidence: 99%

Microbubble-microplastic interactions in batch air flotation

Swart

Pihlajamäki²,

Chew³

et al. 2022

Chemical Engineering Journal

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Section: Applicability Of Experimental Methods and Image Analysismentioning

confidence: 99%

Microbubble-microplastic interactions in batch air flotation

Swart

Pihlajamäki²,

Chew³

et al. 2022

Chemical Engineering Journal

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“…Nevertheless, it has been noted that the latter two factors do not have substantial importance in relation to the coalescence process for the bubble growth . The bubbles size is related to the surface tension of continuous phase and pressure drop, − which is shown in eq : d b ∝ σ normalΔ P …”

Section: Resultsmentioning

confidence: 99%

Novel Method for Desulfurization of Mixed Fuel via Microbubble Oxidation Followed by Microtube Extraction

Adhami,

Movahedirad,

Sobati

2024

Energy Fuels

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In this study, a novel method for the sulfur removal of the mixed fuel (70% vacuum gas oil and 30% natural gas condensate) using ozone microbubbles as the oxidant followed by solvent extraction in a millichannel has been investigated. In this regard, the mixed fuel was saturated with a gaseous oxidant (i.e., ozone) in a pressurized saturation chamber. After that, dissolved ozone appeared in the form of microbubbles by passing through a pressure-reducing valve, which could perform the oxidation of sulfur-containing compounds efficiently. It was revealed that ∼75% sulfur removal was achieved by oxidation of fuel for 60 min with an ozone saturating pressure of 2.5 barg, while the same level of the desulfurization was attained for 90 min of oxidation at 1.5 barg. Afterward, the oxidized sulfur compounds were removed by extraction inside a millichannel. It was found that the sulfur removal efficiency could be enhanced by 12% in comparison with solvent extraction using a batch contactor. Chemical consumption and energy input requirement are the other factors characterized in this study and compared with the conventional oxidative desulfurization process. The results have revealed that applying a saturating pressure of 1.5 barg for 120 min of ozonation has decreased the energy consumption by about 15% to achieve a certain desulfurization level.

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“…This affects the overall separation efficiency of a micro-bubble flotation system. If the rise velocity is too high, it will result in high turbulence and can break bubble-floc particles, which could result in low separation efficiency [33,35].…”

Section: Effect Of Hydraulic Retention Timementioning

confidence: 99%

Chemical-Free Biologically Enhanced Primary Treatment of Raw Wastewater for Improved Capture Carbon

Azhar

Nolan

Cadee

et al. 2022

Water

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Conventional wastewater treatment processes require extensive energy inputs for their operations. Biologically enhanced primary treatment (BEPT) is a promising technology to capture incoming organics that may be utilized to produce biogas and potentially hydrogen with further downstream processing. This study involved a biologically enhanced primary treatment (BEPT) of raw wastewater at bench and pilot-scale using activated sludge (AS) addition and dissolved air flotation (DAF) using raw wastewater at a municipal wastewater facility in Western Australia with average chemical oxygen demand of ~800 mg/L. The results of pilot-scale testing showed an improved removal performance for total chemical oxygen demand (COD-T), soluble chemical oxygen demand (COD-S), and total suspended solids (TSS) compared to conventional primary treatment (PT). Specifically, average COD-T, COD-S and TSS removals for BEPT were 33.3%, 13.5% and 45%, respectively which was 10%, 100% and 6% higher than PT. Moreover, the sludge produced from BEPT had a high solids content of 4.8 g/L, which might not need further thickening prior to anaerobic digestion. It is important to note that no chemicals were used during BEPT testing, which makes the process very cost-effective.

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Effects of influent physicochemical characteristics on air dissolution, bubble size and rise velocity in dissolved air flotation: A review

Cited by 55 publications

References 90 publications

Microbubble-microplastic interactions in batch air flotation

Microbubble-microplastic interactions in batch air flotation

Novel Method for Desulfurization of Mixed Fuel via Microbubble Oxidation Followed by Microtube Extraction

Chemical-Free Biologically Enhanced Primary Treatment of Raw Wastewater for Improved Capture Carbon

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