A model to estimate the size of aggregates formed in a Dissolved Air Flotation unit

被引：10

作者：

Bondelind, Mia ^{[1
]}

Sasic, Srdjan ^{[2
]}

Bergdahl, Lars ^{[1
]}

机构：

[1] Chalmers Univ Technol, Dept Civil & Environm Engn, S-41296 Gothenburg, Sweden

[2] Chalmers Univ Technol, Dept Appl Mech, S-41296 Gothenburg, Sweden

来源：

APPLIED MATHEMATICAL MODELLING | 2013年 / 37卷 / 05期

基金：

瑞典研究理事会;

关键词：

Dissolved Air Flotation (DAF); Water treatment; Flocs; Air bubbles; Aggregate size; Numerical model; WASTE-WATER; CFD MODEL; BUBBLE-SURFACE; KINETIC-MODEL; POTABLE WATER; SOLID SPHERE; ALGAE; FLOW; PARTICLES; COAGULATION;

D O I：

10.1016/j.apm.2012.07.004

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In Dissolved Air Flotation (DAF) a solid phase is separated from a liquid phase with the aid of air bubbles. The solid phase is usually coagulated into larger particles termed flocs. The air bubbles and flocs form aggregates, which rise to the surface of the flotation unit where they are removed. In this paper we propose a model that estimates the size of the formed aggregates. The estimation is based on the local balance of forces describing the approach and attachment of flocs to air bubbles. The interaction of flocs and bubbles is described by surface forces, hydrodynamic forces and the buoyancy force. The model is validated with available experimental results and the obtained aggregate sizes agree reasonable with those obtained by the experiments. The approach proposed here is intended for water treatment applications, but can be modified for other flotation processes. (C) 2012 Elsevier Inc. All rights reserved.

引用

页码：3036 / 3047

页数：12

共 60 条

[1] RESISTANCE COEFFICIENT OF A SOLID SPHERE APPROACHING PLANE AND CURVED BOUNDARIES
ADAMCZYK, Z
ADAMCZYK, M
VANDEVEN, TGM
[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1983, 96 (01) : 204 - 213
[2] Evaluation of the microbial risk reduction due to selective closure of the raw water intake before drinking water treatment
Astrom, J.
Petterson, S.
Bergstedt, O.
Pettersson, T. J. R.
Stenstrom, T. A.
[J]. JOURNAL OF WATER AND HEALTH, 2007, 5 : 81 - 97
[3] Treatment of wastewaters of paper industry by coagulation-electroflotation
Ben Mansour, L.
Ksentini, I.
Elleuch, B.
[J]. DESALINATION, 2007, 208 (1-3) : 34 - 41
[4] Single- and two-phase numerical models of Dissolved Air Flotation: Comparison of 2D and 3D simulations
Bondelind, Mia
Sasic, Srdjan
Kostoglou, Margaritis
Bergdahl, Lars
Pettersson, Thomas J. R.
[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2010, 365 (1-3) : 137 - 144
[5] THE SLOW MOTION OF A SPHERE THROUGH A VISCOUS FLUID TOWARDS A PLANE SURFACE
BRENNER, H
[J]. CHEMICAL ENGINEERING SCIENCE, 1961, 16 (3-4) : 242 - 251
[6] In situ analysis of flocs
Chakraborti, Rajat K.
Gardner, Kevin H.
Kaur, Jagjit
Atkinson, Joseph F.
[J]. JOURNAL OF WATER SUPPLY RESEARCH AND TECHNOLOGY-AQUA, 2007, 56 (01): : 1 - 11
[7] FLUID-MECHANICS AND FRACTAL AGGREGATES
CHELLAM, S
WIESNER, MR
[J]. WATER RESEARCH, 1993, 27 (09) : 1493 - 1496
[8] Clift R., 2005, Bubbles, drops, and particles
[9] Crittenden J.C., 2005, Water treatment principles and design
[10] A review of the technological developments of dissolved air flotation
Crossley, Ian A.
Valade, Matthew T.
[J]. JOURNAL OF WATER SUPPLY RESEARCH AND TECHNOLOGY-AQUA, 2006, 55 (7-8): : 479 - 491

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