Evaluation on simultaneous removal of particles and off-flavors using population balance for application of powdered activated carbon in dissolved air flotation process

Kwak, Dong-Heui; Yoo, Seung-Joon; Lee, E. J.; Lee, J. W.

doi:10.2166/wst.2010.830

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…For constant flow conditions, the model Averaged has an analytical solution which is derived in the Appendix A. The analytical solution includes the dimensionless groups Π 1 and Π 3 The separation efficiencies of the heteroaggregation models are calculated with Equation (16) and plotted over the two dimensionless groups Π 1 and Π 3 ( Figure 2). If Π 3 = 0, the efficiency is zero, because no aggregation can occur.…”

Section: Comparison Of the Different Aggregation Modelsmentioning

confidence: 99%

“…The particle-bubble aggregates either float into the froth of the tank or are entrained within the clear or recycle stream [12,13]. DAF is already a widely used separation technique in water and wastewater treatment dealing with the removal of cells, algea, and flocs of organic or inorganic materials from water [1,12,[14][15][16][17]. In order to yield high separation efficiencies, a pre-flocculation process with coagulants can be favorable [1,18,19].…”

Section: Introductionmentioning

confidence: 99%

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Modeling the Separation of Microorganisms in Bioprocesses by Flotation

Schmideder¹,

Kirse²,

Hofinger³

et al. 2018

Preprint

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Bioprocesses for the production of renewable energies and materials lack efficient separation processes for the utilized microorganisms such as algae and yeasts. Dissolved air flotation (DAF) and microflotation are promising approaches to overcome this problem. The efficiency of these processes depends on the ability of microorganisms to aggregate with microbubbles in the flotation tank. In this study, different new or adapted aggregation models for microbubbles and microorganisms are compared and investigated for their range of suitability to predict the separation efficiency of microorganisms from fermentation broths. The complexity of the heteroaggregation models range from an algebraic model to a 2D population balance model (PBM) including the formation of clusters containing several bubbles and microorganisms. The effect of bubble and cell size distributions on the flotation efficiency is considered by applying PBMs, as well. To determine the impact of the model assumptions, the modeling approaches are compared and classified for their range of applicability. Evaluating computational fluid dynamics (CFD) of a DAF system shows the heterogeneity of the fluid dynamics in the flotation tank. Since analysis of the streamlines of the tank show negligible backmixing, the proposed aggregation models are coupled to the CFD data by applying a Lagrangian approach.

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Section: Comparison Of the Different Aggregation Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling the Separation of Microorganisms in Bioprocesses by Flotation

Schmideder¹,

Kirse²,

Hofinger³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…The removal of microorganisms requires a hydrophobic surface, which might require usage of an appropriate surfactant [20]. DAF is already a widely-used separation technique in water and wastewater treatment dealing with the removal of cells or algae [3,18], particles and off-flavors [21] and flocs of organic or inorganic materials [22] from water. In order to yield high separation efficiencies, a pre-flocculation process with coagulants such as metallic salts, polymers, cetyl trimethyl ammonium bromide and chitosan can be favorable for the separation of algae [23].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Separation of Microorganisms in Bioprocesses by Flotation

et al. 2018

View full text Add to dashboard Cite

Bioprocesses for the production of renewable energies and materials lack efficient separation processes for the utilized microorganisms such as algae and yeasts. Dissolved air flotation (DAF) and microflotation are promising approaches to overcome this problem. The efficiency of these processes depends on the ability of microorganisms to aggregate with microbubbles in the flotation tank. In this study, different new or adapted aggregation models for microbubbles and microorganisms are compared and investigated for their range of suitability to predict the separation efficiency of microorganisms from fermentation broths. The complexity of the heteroaggregation models range from an algebraic model to a 2D population balance model (PBM) including the formation of clusters containing several bubbles and microorganisms. The effect of bubble and cell size distributions on the flotation efficiency is considered by applying PBMs, as well. To determine the sensitivity of the results on the model assumptions, the modeling approaches are compared, and suggestions for their range of applicability are given. Evaluating the computational fluid dynamics (CFD) of a dissolved air flotation (DAF) system shows the heterogeneity of the fluid dynamics in the flotation tank. Since analysis of the streamlines of the tank show negligible back mixing, the proposed aggregation models are coupled to the CFD data by applying a Lagrangian approach.

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Comparative Study on Removal Characteristics of Disinfection By-products by Air Stripping and Flotation Processes

Cha¹,

Won²,

Lee³

et al. 2016

Journal of Korean Society of Environmental Engineers

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It is well known that volatile compounds including disinfection by-products as well as emissive dissolved gas in water can be removed effectively by air stripping. The micro-bubbles of flotation unit are so tiny as microns while the diameter of fine bubbles applied to air stripping is ranged from hundreds to thousands of micrometer. Therefore, the micro-bubbles in flotation can supply very wide specific surface area to transfer volatile matters through gas-liquid boundary. In addition, long emission time also can be gained to emit the volatile compound owing to the slow rise velocity of micro-bubbles in the flotation tank. There was a significant difference of the THMs species removal efficiency between air stripping and flotation experiments in this study. Moreover, the results of comparative experiments on the removal characteristics of THMs between air stripping and flotation revealed that the mass transfer coefficient, KLa showed obvious differences. To overcome the limit of low removal efficiency of dissolved volatile compounds such as THMs in flotation process, the operation range of bubble volume concentration is required to higher than the operation condition of conventional particle separation.

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Evaluation on simultaneous removal of particles and off-flavors using population balance for application of powdered activated carbon in dissolved air flotation process

Cited by 3 publications

References 15 publications

Modeling the Separation of Microorganisms in Bioprocesses by Flotation

Modeling the Separation of Microorganisms in Bioprocesses by Flotation

Modeling the Separation of Microorganisms in Bioprocesses by Flotation

Comparative Study on Removal Characteristics of Disinfection By-products by Air Stripping and Flotation Processes

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