The role of particle size and density in dissolved air flotation and sedimentation

1997 ◽  
Vol 36 (4) ◽  
Keyword(s):  
Particle Size ◽  
Dissolved Air Flotation ◽  
Air Flotation ◽  
Dissolved Air

Application of dissolved air flotation for treatment of wastewater from meat processing industry

1995 ◽  
Vol 31 (3-4) ◽  
pp. 341-344 ◽  
Author(s):  
J. Wasowski
Keyword(s):  
Rational Design ◽  
Meat Processing ◽  
Waste Waters ◽  
Processing Industry ◽  
Dissolved Air Flotation ◽  
Technological Factors ◽  
Air Flotation ◽  
The Given ◽  
Dissolved Air

The paper concerns the application of dissolved air flotation for treatment of waste water from the meat processing industry. The main aim of the study was identification of the flotation mechanism aided by the coagulation in the layouts with and without recycling, and finding and defining the role of the technological factors influencing flotability of pollutants found in the given waste waters. The results of the studies, supported by the mathematical analysis, form the basis of rational design and conduction of flotation in practice.

Use of dissolved air flotation in potable water treatment in Finland

1995 ◽  
Vol 31 (3-4) ◽  
pp. 225-238 ◽  
Author(s):  
J. Heinänen ◽  
P. Jokela ◽  
T. Ala-Peijari
Keyword(s):  
Water Treatment ◽  
Drinking Water Treatment ◽  
Dissolved Air Flotation ◽  
Unit Process ◽  
Air Bubble ◽  
Special Cases ◽  
Air Flotation ◽  
Practical Experiences ◽  
Dissolved Air

The basic concepts of treating humic waters with dissolved air flotation are discussed emphasizing the important role of zeta potential in the forming of floc-air-bubble-agglomerates. Then practical experiences from Finnish drinking water treatment plants are presented. When surface water is used as a raw water, it is more or less humic. Thirty-six such plants have dissolved air flotation as a clarification process, the oldest one dating from 1965. They serve about one million people. All of them are working well proving that dissolved air flotation is a suitable method in humic water treatment. Some special cases are discussed in detail. These are cases where sufficient data about design, operation and costs are available and which it is hoped can help other designers. The last plant referred to is an example of an advanced treatment process where dissolved air flotation is an integrated unit process.

Separation characteristics in dissolved air flotation - pilot and full-scale demonstration

2003 ◽  
Vol 48 (3) ◽  
pp. 89-96
Author(s):  
M. Ljunggren ◽  
L. Jönsson
Keyword(s):  
Particle Size ◽  
Contact Zone ◽  
Separation Efficiency ◽  
Particle Separation ◽  
Full Scale ◽  
Particle Sizes ◽  
Dissolved Air Flotation ◽  
Air Flotation ◽  
Practical Implications ◽  
Dissolved Air

This study presents practical implications for particle separation in Dissolved Air Flotation (DAF). The objectives were to localise where particles are separated from the water phase and to determine what particles, in terms of size, are removed by the DAF-process. Both pilot- and full-scale plants were investigated. Particle sizes were analysed with a light-blocking particle counter and an optical borescope was used for visualisation of particle-bubble aggregates. It was found that particles are preferably separated upstream in the process, i.e. close to the contact zone. Furthermore, separation efficiency for particles increased with increasing particle size.

The role of hydrophobicity in dissolved air flotation

1983 ◽  
Vol 17 (6) ◽  
pp. 651-657 ◽  
Author(s):  
R.J. Gochin ◽  
J. Solari
Keyword(s):  
Dissolved Air Flotation ◽  
Air Flotation ◽  
Dissolved Air

scholarly journals The role of algal organic matter in the separation of algae and cyanobacteria using the novel “Posi” - Dissolved air flotation process

2018 ◽  
Vol 130 ◽  
pp. 20-30 ◽  
Author(s):  
Narasinga Rao Hanumanth Rao ◽  
Russell Yap ◽  
Michael Whittaker ◽  
Richard M. Stuetz ◽  
Bruce Jefferson ◽  
...  
Keyword(s):  
Organic Matter ◽  
The Novel ◽  
Dissolved Air Flotation ◽  
Flotation Process ◽  
Algal Organic Matter ◽  
Air Flotation ◽  
Dissolved Air

Parameters Influencing Sludge Thickening by Dissolved Air Flotation

1993 ◽  
Vol 28 (1) ◽  
pp. 87-90 ◽  
Author(s):  
M. Sugahara ◽  
S. Oku
Keyword(s):  
Particle Size ◽  
Particle Sizes ◽  
Dissolved Air Flotation ◽  
Flotation Process ◽  
Sludge Characteristics ◽  
Factors Influencing ◽  
Air Flotation ◽  
Sludge Particle ◽  
Sludge Thickening ◽  
Dissolved Air

The purpose of this study was to investigate factors influencing sludge thickening in the dissolved air flotation process. Attention focused on the alteration of sludge characteristics as a result of coagulation and aeration. Batch thickening experiments showed that both coagulation and aeration enhanced sludge thickening. The most important parameter influencing sludge thickening appeared to be sludge particle size; larger particle sizes produced higher sludge solids concentrations in the float.

Modelling the global efficiency of dissolved air flotation

2001 ◽  
Vol 43 (8) ◽  
pp. 159-166 ◽  
Author(s):  
D. M. Leppinen ◽  
S. B. Dalziel ◽  
P. F. Linden
Keyword(s):  
Particle Size ◽  
Bubble Size ◽  
High Surface ◽  
Surface Loading ◽  
Dissolved Air Flotation ◽  
Loading Rates ◽  
Air Flotation ◽  
Bubble Attachment ◽  
Attachment Process ◽  
Dissolved Air

The purpose of this paper is to examine how the efficiency of dissolved air flotation is affected by the size of bubbles and particles. The rise speed of bubble/particle agglomerates is modelled as a function of bubble and particle size, while the kinematics of the bubble attachment process is modelled using the population balance approach adopted by Matsui, Fukushi and Tambo. It is found that flotation, in general, is enhanced by the use of larger particles and larger bubbles. In particular, it is concluded that for the ultra-high surface loading rates of 25 m/hr or more planned for future flotation tanks, bubble size will have to be increased by a factor of two over the size currently employed in many facilities during dissolved air flotation.

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