The practical application of computational fluid dynamics to dissolved air flotation, water treatment plant operation, design and development

2009 ◽  
Vol 58 (1) ◽  
pp. 65-73 ◽  
Author(s):  
Tony Amato ◽  
Jim Wicks
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Practical Application ◽  
Design And Development ◽  
Dissolved Air Flotation ◽  
Plant Operation ◽  
Dissolved Air

Using lessons learned and advanced methods to design a 1,500 Ml/day DAF water treatment plant

2001 ◽  
Vol 43 (8) ◽  
pp. 35-41 ◽  
Author(s):  
I. A. Crossley ◽  
M. T. Valade ◽  
J. Shawcross
Keyword(s):  
Fluid Dynamics ◽  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Lessons Learned ◽  
Plant Design ◽  
Dissolved Air Flotation ◽  
Computational Fluid Dynamics Cfd ◽  
Solids Removal ◽  
Dissolved Air

The paper describes the method that led to the design of the 1,500 Ml/day dissolved air flotation (DAF) water treatment plant for Boston's water supply. In particular, the topics of flocculation techniques, floated solids removal and DAF recycle as they relate to very large capacity plant design are covered in detail. The use of mathematical models, including computational fluid dynamics (CFD) software, to refine the design is described.

Application of computational fluid dynamics (CFD) to ozone contactor optimization

2006 ◽  
Vol 6 (4) ◽  
pp. 9-16 ◽  
Author(s):  
J. Li ◽  
J. Zhang ◽  
J. Miao ◽  
J. Ma ◽  
W. Dong
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Water Treatment ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Original Design ◽  
Computational Fluid Dynamics Cfd ◽  
Ozone Contactor

Many approaches have been used to model the performance and efficiency of ozone contactors based on some assumptions to characterize the backmixing in fluids. Recently, computational fluid dynamics (CFD) technique has been proposed to simulate and optimize ozone contactors by calculating residence time distribution of fluid. To improve the ozone contactor performance of Bijianshan Water Treatment Plant in Shenzhen in South China, CFD was used for simulation and development of new optimization measures. Results showed that the low depth/length ratio of the contactor chambers in the original design resulted in short circuiting and backmixing, with the T10/HRT being only 0.40. Installation of guide plates substantially reduced short circuiting and backmixing with a much higher T10/HRT (0.66), increased by 73% compared with the original design.

scholarly journals Modeling settling tanks for water treatment using computational fluid dynamics

2015 ◽  
Vol 17 (5) ◽  
pp. 745-762 ◽  
Author(s):  
Anastasios Stamou ◽  
Anthoula Gkesouli
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Water Treatment ◽  
Suspended Solids ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Hydraulic Efficiency ◽  
Dynamics Model ◽  
Negative Effect ◽  
Settling Performance

A computational fluid dynamics model is presented for the calculation of the flow, suspended solids, and tracer concentration fields in the settling tanks of the water treatment plant of Aharnes, an important component of the water supply system of the greater area of Athens, Greece. The model is applied to investigate the expected negative effect of the wind on the hydraulic and settling performance of the tanks and to evaluate the improvement resulting from the installation of one and two baffles; the wind is modeled using a simple and very conservative approach that involves the setting of a constant horizontal flow velocity on the free surface. The model is calibrated and verified with field turbidity measurements. Calculations show that the effect of wind on the flow field and the hydraulic efficiency is strong, with the creation of massive re-circulation areas with intense mixing and high short circuiting; however, the effect of wind on the settling performance of the tanks is not pronounced. The removal efficiency of the tanks, which is 72.48% in calm conditions, is reduced to 68.07% for windy conditions; moreover, it increases to 70.00 and 71.04%, when one or two baffles are installed, respectively.

Birmingham Frankley water treatment works redevelopment

1995 ◽  
Vol 31 (3-4) ◽  
pp. 213-223
Author(s):  
T. Schofield
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Main Stage ◽  
Process Stream ◽  
Dissolved Air Flotation ◽  
Treatment Facilities ◽  
Selection Of ◽  
Design Construction ◽  
Dissolved Air

Severn Trent Water are currently undertaking an extensive capital programme to enhance water treatment facilities at many of its major works. This paper describes the various aspects of the Birmingham Water Treatment Plant Redevelopment Strategy with specific emphasis on the factors that lead to the selection of dissolved air flotation (DAF) as a main stage of clarification and subsequent construction of the largest DAF plant in the world. The design, construction and operation of the plant are reviewed with particular attention to water quality and the use of carbon dioxide within the process stream to produce a stable treated water.

The first DAF water treatment plant in the United States

1995 ◽  
Vol 31 (3-4) ◽  
pp. 239-246 ◽  
Author(s):  
David Nickols ◽  
Gerard C. Moerschell ◽  
Michael V. Broder
Keyword(s):  
United States ◽  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
The United States ◽  
Regulatory Body ◽  
Process Selection ◽  
Dissolved Air Flotation ◽  
Air Flotation ◽  
Dissolved Air

The Millwood Water Treatment Plant in Westchester County, about 60 kilometres (35 miles) north of New York City, was commissioned in August 1993. This plant is the first dissolved air flotation (DAF) plant in the United States which uses the DAF technology and concepts that have become the industry standards in Europe and Australia. The $19-million plant was built to treat a previously unfiltered supply, to meet the requirements of the new federal Surface Water Treatment Rule. This paper describes the project in its entirety: starting from the planning, pilot testing, and process selection; proceeding to the means of overcoming resistance to a “new” process and obtaining regulatory body approvals; and outlining the design, process criteria, construction, and start-up of the plant. Operating results are also presented. The plant treats soft, slightly colored, generally low turbidity water which experiences occasional turbidity spikes of 100 NTU or more. The treatment process comprises two-stage mixing, three-stage flocculation, dissolved air flotation, ozonation for primary disinfection, dual-media filtration, and post-treatment with chlorine, sodium hydroxide, orthophosphate and fluoride. Flotation sludge is dewatered in on-site freeze/thaw lagoons for off-site disposal in a landfill.

The Use of Computational Fluid Dynamics for Improving the Design and Operation of Water and Wastewater Treatment Plants

1999 ◽  
Vol 40 (4-5) ◽  
pp. 81-89 ◽  
Author(s):  
C. J. Brouckaert ◽  
C. A. Buckley
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wastewater Treatment ◽  
Potable Water ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Outer Wall ◽  
Water And Wastewater Treatment ◽  
Secondary Clarifier

Computational Fluid Dynamics (CFD) studies of a secondary clarifier at Durban's Northern Wastewater Treatment Works, and of a clarifier at the potable water treatment plant at Umzinto, a small town near Durban, have been undertaken with a view to improving their load capacities. In both cases the units are located in relatively old treatment plants, which face continually increasing loads due to population growth. Increasing the capacity of existing equipment, rather than installing new equipment, constitutes an efficient use of development capital. Although the two clarifiers have considerable design differences, the CFD studies indicated remarkably similar circulating flows, which concentrate up-flow near the outer wall of the clarifier in the region of the clarified water overflow weirs. Baffles were designed to disrupt the circulation so as to distribute up-flow over a wider area, thereby reducing the maximum vertical velocities. In the case of the wastewater secondary clarifier, the modification has been implemented, and evaluated in comparative tests involving an otherwise identical unmodified clarifier. In the case of the potable water clarifier, the modification has still to be implemented.

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