The influence of some parameters on bubble average diameter in an electroflotation cell by laser diffraction method

Cruz, Samantha Grisol da; Dutra, Achilles Junqueira Bourdot; Monte, Marisa Bezerra de Mello

doi:10.1016/j.jece.2016.05.017

Cited by 22 publications

(7 citation statements)

References 24 publications

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“…Hydrogen bubble size commonly conforms to a normal distribution, and the bubbles have minimal size when pH is neutral [89]. The results of experiments carried out in da Cruz et al [31] and Hacha et al [32] show that the Sauter mean diameter of hydrogen bubbles decreases with increase of pH. On the contrary, the Sauter mean diameter of oxygen bubbles increases with increase of pH [31,32,89].…”

Section: Factors That Influence the Choice Of Flotator Type 231 Param...mentioning

confidence: 97%

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Common Issues in Aeration System Choice for Flotation Wastewater Treatment

Сазонов

Antonova

2023

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Flotation wastewater treatment is widely used in various treatment systems. The choice of aeration system plays a considerable role in the development of highly efficient flotation tanks. The objective of this work is to point out factors that influence the choice of flotator type, and to offer recommendations based on literature review and data analysis. In this paper, the various types of aeration systems used in flotation tanks are considered: mechanical, pneumatic, pneumohydraulic and ejection systems as well as dissolved air flotation and electroflotation systems. Their main advantages and disadvantages are pointed out. The specific features of flotation tank constructions are considered. The factors that influence the choice of aeration system such as the parameters of wastewater (pH, conductivity, temperature), requirements for the quality of treated water, reliability and simplicity of maintenance, capital and operating costs are defined. The peculiarities of various aeration system applications in different conditions are revealed. A comparison of the energy consumption of the considered systems of aeration is presented. In conclusion, practical recommendations for the choice of aeration system depending on various factors are offered.

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Section: Factors That Influence the Choice Of Flotator Type 231 Param...mentioning

confidence: 97%

“…In case of electroflotation, hydrogen bubbles are formed on the cathode and oxygen bubbles are formed on the anode due to the electrolysis of water caused by a direct electric current. The bubble sizes generated are approximately in the range of 40-80 μm, depending on the current density, pH, and conductivity [31][32][33][34][35].…”

Section: Electroflotationmentioning

confidence: 99%

Common Issues in Aeration System Choice for Flotation Wastewater Treatment

Сазонов

Antonova

2023

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“…Meegoda et al (2018) determined the distribution of NBs and MBs over a size range of 0.3 nm to 10 μm using a Dynamic Light Scattering (DLS) instrument (Zetasizer Nano ZS, Malvern Instruments Ltd.). da Cruz et al (2016) used laser diffraction (LD) method (Mastersizer 2000SM device, Malvern Instruments Ltd.) to determine the average bubble size generated in an electrolytic flotation (EF) system. Compared with LD, DLS can be used to measure samples with much smaller particle sizes (Badger 2019).…”

Section: Size Measurementmentioning

confidence: 99%

Microbubble and nanobubble-based gas flotation for oily wastewater treatment: a review

et al. 2022

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Gas flotation for oily wastewater treatment is based on the attachment of gas bubbles to oil droplets to produce lighter aggregates that rise to the wastewater surface. It is a feasible, promising, and effective method for oily wastewater treatment due to its high separation efficiency with no secondary contamination, cost-effectiveness, and simple operation. This review focuses on separating oil from emulsions by gas flotation using microbubbles and nanobubbles which offer the advantages of small bubble size, large specific surface area, and slow rising velocity. The properties of different types of gas bubbles and their generation methods were discussed. Different gas flotation system designs and operational parameters were summarized for dissolved gas flotation, induced gas flotation, and electrolytic flotation. The review illustrated that oil removal efficiency in microbubble and nanobubble-based gas flotation was affected by various factors including initial oil concentration, pH, temperature, flotation time, and oil droplet size.

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“…A smaller gas bubble size is more effective on the floating of suspended particles [8,9]. Various methods have been used to measure the diameter of gas bubbles formed, such as the laser diffraction method [10], which requires high maintenance of operation costs. Measuring the bubble diameter using a digital camera with the aid of a magnifying glass has been evaluated manually [14].…”

Section: Introductionmentioning

confidence: 99%

Segmentation on Electrode Surface: Enhancement of Electroflotation on Laboratory of Wastewater Treatment

Jumrah¹,

Putra²

2023

Atlantis Highlights in Chemistry and Pharmaceutical Sciences

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Performance of the electroflotation process is strongly influenced by the size and number of the hydrogen and oxygen gas bubbles that form during the electrolysis of water. In this study, the analysis of the size distribution of gas bubbles by the segmentation of the electrode surface was evaluated. Further results as the optimum condition were then applied in the laboratory of wastewater treatment. Stainless Steel electrode was used as the cathode, and Titanium was used as an anode at a constant voltage of 20 V for 30 min process. The results showed that the average gas bubble size was found to vary in the range of 0.15-0.4 mm, which impacted the maximum collision between the gas bubbles and colloidal particles during the electroflotation process. In addition, the number of gas bubbles that formed has affected the performance of this process. The effectiveness of the electroflotation process was evaluated by decreasing the turbidity, total dissolved solid (TDS), Pb concentration, and light intensity. The initial conditions of chemical laboratory wastewater with a 20-times dilution showed that the turbidity, TDS, Pb concentration, and light intensity were 41.8 NTU, 680 mg/L, 1.291 mg/L, and 782 lx, respectively. The optimum results obtained by the electroflotation process under the same parameters were 0.22 NTU (99.47%), 534 mg/L (21.47%), 0.443 mg/L (65.59%), and increased light intensity by 1031 lx. Based on these results, it can be concluded that the electroflotation process has proven to reduce pollutants.

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The influence of some parameters on bubble average diameter in an electroflotation cell by laser diffraction method

Cited by 22 publications

References 24 publications

Common Issues in Aeration System Choice for Flotation Wastewater Treatment

Common Issues in Aeration System Choice for Flotation Wastewater Treatment

Microbubble and nanobubble-based gas flotation for oily wastewater treatment: a review

Segmentation on Electrode Surface: Enhancement of Electroflotation on Laboratory of Wastewater Treatment

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