CFD-based process optimization of a dissolved air flotation system for drinking water production | Zendy

Kamalakanta Satpathy | Zendy; Usman Rehman | Zendy; B. Cools | Zendy; Liesbeth Verdickt | Zendy; Gisèle Peleman | Zendy; Ingmar Nopens | Zendy

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

Author(s) -

Kamalakanta Satpathy,

Usman Rehman,

B. Cools,

Liesbeth Verdickt,

Gisèle Peleman,

Ingmar Nopens

Publication year - 2020

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2020.028

Subject(s) - dissolved air flotation , computational fluid dynamics , process engineering , process (computing) , flow (mathematics) , multiphase flow , wastewater , extraction (chemistry) , process design , mixing (physics) , environmental science , flow conditions , flocculation , engineering , petroleum engineering , computer science , environmental engineering , chemistry , mechanics , process integration , chromatography , physics , aerospace engineering , operating system , quantum mechanics

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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