Fundamental aspects of microbubble flotation processes

Solari, Jaime A.; Gochin, R.J.

doi:10.1016/b978-0-444-88284-4.50018-4

Cited by 11 publications

(7 citation statements)

References 43 publications

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“…Part of the dissolved air in water does not convert into bubbles in the nozzles, remains in solution and "nucleate" at particle surfaces (Solari and Gochin, 1992). In this case, bubbles nuclei and growth at the solid/liquid interface, as can be seen in Fig.…”

Section: Mechanisms Involved In the Interaction Between Particles Andmentioning

confidence: 96%

“…However, in flotation with microbubbles, mechanisms of bubble/particle (aggregates) interactions, other than the common adhesion through hydrophobic forces, have been proposed, namely (Solari and Gochin, 1992;Rubio et al, 2002a,b, Rubio, 1998Carissimi and Rubio, 2005b): a) Nucleation phenomena at solid surfaces. Part of the dissolved air in water does not convert into bubbles in the nozzles, remains in solution and "nucleate" at particle surfaces (Solari and Gochin, 1992).…”

Section: Mechanisms Involved In the Interaction Between Particles Andmentioning

confidence: 99%

“…Thus, DAF microbubbles are used to capture only the small, light solids and metal-ion hydroxide flocs, bacteria, etc., having specific weights close to that of water. Bubbles generated in the ore flotation machines (600-2500 μm bubbles diameters) are not suitable for the separation of those fine particles (Solari and Gochin, 1992;Rubio et al, 2002a,b).…”

Section: Introduction and A Short Overviewmentioning

confidence: 97%

See 2 more Smart Citations

DAF–dissolved air flotation: Potential applications in the mining and mineral processing industry

Rodrigues

Rubio

2007

International Journal of Mineral Processing

180

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Section: Mechanisms Involved In the Interaction Between Particles Andmentioning

confidence: 96%

Section: Mechanisms Involved In the Interaction Between Particles Andmentioning

confidence: 99%

Section: Introduction and A Short Overviewmentioning

confidence: 97%

See 1 more Smart Citation

DAF–dissolved air flotation: Potential applications in the mining and mineral processing industry

Rodrigues

Rubio

2007

International Journal of Mineral Processing

180

View full text Add to dashboard Cite

“…Thus, DAF microbubbles are used to capture only the small, light solids and metal-ion hydroxide flocs, bacteria, etc., having specific weights close to that of water. Bubbles generated in the ore flotation machines (600-2500 lm bubbles diameters) are not suitable for the separation of those fine particles [2,3,26,27]. In summary, DAF may be used and appears to have potential in many mining applications, namely:…”

Section: Introductionmentioning

confidence: 99%

Failure Analysis of a Dissolved Air Flotation Treatment Plant in a Dairy Industry

Babatola

Oladepo

Lukman

et al. 2011

J Fail. Anal. and Preven.

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Environmental pollution in Nigeria presents an urgent need to assess wastewater treatment facilities in various industries. This article presents an assessment of dissolved air flotation (DAF) operation in a dairy industry. The industry was visited, wastewater treatment facilities were assessed (based only on efficacy to remove selected environmental health-related pollutants) and measurements of essential design and characterization parameters were taken. The study revealed that the averages of flow rate, biochemical oxygen demand at 5 days (BOD 5 ), chemical oxygen demand (COD), suspended solids (SS) and total solids (TS) of the influent wastewater into the plant (DAF) were 3.45 L/s, 1652.37, 3304.67, 2333.82, and 4396.10 mg/L compared to effluent quality of 560. 37, 1127.33, 172.33, and 1866.67 mg/L for BOD 5 , COD, SS, and TS, respectively. The pH of the wastewater is being adjusted by addition of lime before the effluent equalization tank and individual efficacies of the system were 66. 09, 65.89, 65.89, 57.54, 8.68, and 94.49% for BOD 5 , COD, SS, TS, DS, and total nitrogen, respectively, with overall efficacy of 38.10%. It was concluded that failure (lower overall efficacy) of the system can be attributed to setting of lime in the oversized equalization tank (50 m 3 instead of 16.82 m 3 per 8 h shift), the lack of application of standardized engineering code and practices (provision of underground tank in the process, lack of complete coagulation processes, coagulation and flocculation units), lack of adequate aeration unit and lack of reliable systems for automatically adjusting dosage of coagulant and flocculant. Although, DAF unit is the centerpiece of a DAF-based system design, there are several other supporting systems important to optimal DAF operation. These observations, coupled with the analysis in this report, demonstrate that the facilities necessary to minimize continuous environmental pollution are lacking. Pollution will become an increasing problem unless pollution preventing codes and standards are developed; incorporated into government regulations and the regulations are enforced.

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“…Schulze (1984) analysed the elementary processes of flotation in terms of physico-chemistry. Solari and Gochin (1992) investigated the effect of bubble sizes on adhesion probability. Polat and Chander (2000) estimated the true distribution of flotation rate constants for a first-order kinetics model.…”

Section: Introductionmentioning

confidence: 99%