Large batch bench-scale dissolved air flotation system (LB-DAF) for drinking water treatability tests

2020 ◽  
Vol 6 (4) ◽  
pp. 1004-1017 ◽  
Author(s):  
Juan Pablo Gonzalez-Galvis ◽  
Roberto M. Narbaitz
Keyword(s):  
Drinking Water ◽  
River Water ◽  
Full Scale ◽  
Dissolved Air Flotation ◽  
Large Batch ◽  
Bench Scale ◽  
Air Flotation ◽  
Dissolved Air

A new bench-scale batch DAF system was developed, for the river water tested it yielded better predictions of full-scale DAF turbidity removals than a commercial DAF jar tester.

Dissolved air flotation in drinking water production

2001 ◽  
Vol 43 (8) ◽  
pp. 9-18 ◽  
Author(s):  
T. Schofield
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Potable Water ◽  
Water Production ◽  
Process Technology ◽  
Dissolved Air Flotation ◽  
Drinking Water Production ◽  
Air Flotation ◽  
Potable Water Treatment ◽  
Dissolved Air

Dissolved Air Flotation (DAF) has become increasingly important in the field of potable water treatment, as a preferred option for treating upland and stored lowland waters. This paper outlines the development of dissolved air flotation (DAF) in potable water treatment, the benefits and disadvantages and the recent advances that has taken the process technology from an art to a science.

A simplified method for assessing the saturation efficiency at full-scale dissolved air flotation plants

1998 ◽  
Vol 38 (6) ◽  
pp. 303-310 ◽  
Author(s):  
S. Steinbach ◽  
J. Haarhoff
Keyword(s):  
Full Scale ◽  
Dissolved Air Flotation ◽  
Atmospheric Air ◽  
Comprehensive Method ◽  
Simplified Method ◽  
Saturation Efficiency ◽  
Air Flotation ◽  
Saturation Systems ◽  
Measuring Unit ◽  
Dissolved Air

This paper proposes a simplified yet comprehensive method for measuring the efficiency of air saturation systems used in dissolved air flotation. It is based on a review of methods suggested by other researchers in this field, but several improvements to existing methods are made. A saturation air composition different than that of atmospheric air and incomplete precipitation in the measuring unit after pressure release are taken into consideration. The developed measurement and calculation procedure provide engineers and operators alike with an easy tool to assess the saturation efficiency of their system at full-scale DAF plants as well as at pilot and laboratory scale plants.

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.

scholarly journals CFD-based process optimization of a dissolved air flotation system for drinking water production

2020 ◽  
Vol 81 (8) ◽  
pp. 1668-1681 ◽  
Author(s):  
K. Satpathy ◽  
U. Rehman ◽  
B. Cools ◽  
L. Verdickt ◽  
G. Peleman ◽  
...  
Keyword(s):  
Drinking Water ◽  
Treatment Plant ◽  
Dissolved Air Flotation ◽  
Modelling Framework ◽  
Flow Features ◽  
Drinking Water Production ◽  
Air Flotation ◽  
Process Fluid ◽  
Experimental Findings ◽  
Dissolved Air

Abstract Dissolved air flotation (DAF) has received more attention recently as a separation technique in both drinking water as well as wastewater treatment. However, the process as well as the preceding flocculation step is complex and not completely understood. Given the multiphase nature of the process, fluid dynamics studies are important to understand and optimize the DAF system in terms of operation and design. The present study is intended towards a comprehensive computational analysis for design optimization of the treatment plant in Kluizen, Belgium. Setting up the modelling framework involving the multiphase flow problem is briefly discussed. 3D numerical simulations on a scaled down model of the DAF design were analysed. The flow features give better confidence, but the flocs escape through the outlet still prevails which is averse to the system performance. In order to improve the performance and ease of maintenance, design modifications have been proposed by using a perforated tube for water extraction and are found to be satisfactory. The discussion is further reinforced through validating the numerical model against the experimental findings for stratified flow conditions.

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