CFD modelling of flow field and particle tracking in a hydrodynamic stormwater separator

2010 ◽  
Vol 62 (10) ◽  
pp. 2381-2388 ◽  
Author(s):  
J. H. Lee ◽  
K. W. Bang ◽  
C. S. Choi ◽  
H. S. Lim
Keyword(s):  
Flow Field ◽  
Removal Efficiency ◽  
Particle Tracking ◽  
Best Management Practices ◽  
Management Practices ◽  
Separation Efficiency ◽  
Pollutant Removal ◽  
Solid Particles ◽  
Storm Water ◽  
Velocity Flow

The best management practices (BMPs) for control of urban stormwater pollution are evaluated to remove solid particles containing various pollutants. Currently, most storm runoff treatment devices using primary pollutant removal mechanism are applied to storm water since most pollutants in runoff are associated with the solid particulates. A hydrodynamic separator is a storm water treatment device using centrifugal motion which separates solids pollution from runoff. In this study, the velocity flow field and particle tracking of hydrodynamic separator were investigated using anthracite as a computational fluid dynamics (CFD) model particle. The Fluent 6.3.26 CFD program was used to predict the solid particles removal efficiency for various parameters such as particle size, surface loading rate, and the ratio of underflow to overflow. The velocity flow field in a hydrodynamic stormwater separator (HDS) has been simulated using CFD RNG κ-ɛ model. Modeling results for the removal efficiency of HDS were similar with the results obtained from experimental measurements of laboratory scale HDS. These results showed that the simulated velocity field was useful to interpret the behavior of flow in the hydrodynamic separator. The results obtained from particle tracking can be applied to predict the separation efficiency.

Filtration Treatment of Pollutants in Urban Runoff Using Expanded Polypropylene Media

2007 ◽  
Vol 544-545 ◽  
pp. 573-576
Author(s):  
Sung Won Kang ◽  
Byung Cheol Lee ◽  
Young Im Kim ◽  
Sang Leen Yun ◽  
Yong Jin Park ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Best Management Practices ◽  
Urban Areas ◽  
Management Practices ◽  
Removal Rate ◽  
Stormwater Runoff ◽  
Expansion Ratio ◽  
Pollutant Removal ◽  
Polynuclear Aromatic Hydrocarbons ◽  
Filter Media

Pollutants such as heavy metals and PAHs (Polynuclear Aromatic Hydrocarbons) in stormwater runoff are a major problem in urban areas because these pollutants are discharged directly, in most cases without any treatment, into the receiving environments like river and lake. Since many of the pollutants are associated with suspended particulate materials in stormwater, SS (suspended solids) is of acknowledged importance in stormwater runoff treatment by BMPs (best management practices). Filtration, which is commonly used for removing particulate matter in stormwater structural BMPs, depends on various factors (e.g., filter media size, flow rate, bed depth, filter surface properties, etc). Especially, the characteristics of filter media are important factor affecting removal efficiency of pollutants and replacement period of filter media in filtration performance. In this study, EPM (expanded polypropylene media) as a filter media was manufactured at different expansion ratios (i.e., 5, 10, 15 times) and tested in the up-flow filtration for removing pollutants in urban stormwater runoff. The specific surface area of EPM10, EPM15, EPM30, EPM54 was 0.760 m2/g, 0.799 m2/g, 0.812 m2/g, 0.845 m2/g, respectively. The SS removal efficiency (64.1%) by EPM media was higher than that (44.2%) by sand media. In case of EPM10 media, it took 175min of removal rate of filtration system to be approached under 50% and EPM15 media was spent 110min. However, the SS removal efficiency of EPM15 was over 10% higher than that of EPM10. The CODCr removal efficiency of EPM media was also increased with increasing expansion rate. The experimental results in this work show that pollutant removal efficiency by EPM media was increased with increasing expansion ratio but replacement period of media was decreased. EPM media are expected to adsorb non-biological organics like PAHs owing to its hydrophobicity.

scholarly journals Lack of Data for Predicting Storm Water Pollutant Removal by Post-Construction Best Management Practices

2016 ◽  
Author(s):  
Andrew Whelton ◽  
Jeffrey Gill ◽  
Li Song ◽  
Bryce Froderman ◽  
Mahboobeh Teimouri ◽  
...  
Keyword(s):  
Best Management Practices ◽  
Management Practices ◽  
Pollutant Removal ◽  
Storm Water ◽  
Best Management ◽  
Water Pollutant

Stormwater management in a catchbasin perspective - best practices or sustainable strategies?

2002 ◽  
Vol 46 (6-7) ◽  
pp. 159-166 ◽  
Author(s):  
M. Bäckström ◽  
P.-A. Malmqvist ◽  
M. Viklander
Keyword(s):  
Best Management Practices ◽  
Stormwater Management ◽  
Management Practices ◽  
Pollutant Removal ◽  
Best Management ◽  
Environmental Objectives ◽  
Important Pathway ◽  
Pollutant Sources ◽  
Pollutant Source ◽  
The Eu

A strategy for sustainable stormwater management is needed. This study has focused on the relative importance of stormwater as a pollutant source in a catchbasin, if Best Management Practices (BMPs) result in pollutant removal or pollutant redistribution, and methods for screening of stormwater strategies. Stormwater is most likely an important pathway for pollutants in a catchbasin perspective. True pollutant removal can only be achieved if the pollutant sources are eliminated. Until that is reached, we should have the best possible control of the pollutant fluxes in the watershed. This study indicates that the search for a sustainable stormwater strategy could be easier to handle if different “screens” could be used. The Swedish environmental objectives, which try to encapsulate all aspects of sustainability, may be used as a foundation for a “sustainability screen”. By using this screen, the “unsustainable” features of different stormwater strategies could be pointed out. A “standards and legislation screen” will be based on the EU Water Framework Directive. As this study has shown, it is doubtful whether the conventional BMPs, such as stormwater ponds and infiltration facilities, produce a sufficient pollutant control.

Aspects of Functional Analysis of Mitigated Wetlands Receiving Highway Runoff

1998 ◽  
Vol 1626 (1) ◽  
pp. 21-30 ◽  
Author(s):  
Shaw L. Yu ◽  
T. Andrew Earles ◽  
G. Michael Fitch
Keyword(s):  
Water Management ◽  
Best Management Practices ◽  
Management Practices ◽  
Wetland Mitigation ◽  
Storm Water ◽  
Vegetation Density ◽  
Storm Events ◽  
Highway Runoff ◽  
Storm Water Management ◽  
Mitigated Wetlands

The wetland mitigation and storm water management provisions in the 1987 Clean Water Act significantly affect transportation agencies. A common requirement of these federal storm water management provisions and state storm water regulations is the use of best-management practices (BMPs). The Virginia Department of Transportation has constructed more than 200 wetlands and many storm water BMPs, such as detention basins. A potentially cost-effective approach to satisfying wetland mitigation requirements and storm water regulations is to use mitigated wetlands as storm water BMPs. A multifunctional evaluation of two mitigated wetlands receiving highway runoff is presented to examine the feasibility of using mitigated wetlands as storm water BMPs. Influent and effluent water quality and quantity were monitored at the sites during storm events. Vegetation density and diversity and wetland wildlife were examined as functional indicators because they were believed to be the most likely to be impaired by highway runoff. Data collected were stored in a geographic information system, which was developed to serve as a database for current and future monitoring of mitigated wetland sites. Both sites had peak reductions in excess of 40 percent, with attenuation of greater than 90 percent for a system combining a detention basin and a mitigated wetland in series. Removal rates were as high as 90 percent for total suspended solids, 65 percent for chemical oxygen demand, 70 percent for total phosphorus and orthophosphate, and 50 percent for zinc. Despite having highway runoff as a primary water source, both sites support apparently healthy and diverse vegetative communities and provide habitat for a variety of wildlife.

scholarly journals Storm Water Best Management Practices that Maximize Aquifer Recharge

2008 ◽  
Vol 3 (1) ◽  
pp. 126-138 ◽  
Author(s):  
Rebecca A Larson ◽  
Steven I Safferman
Keyword(s):  
Best Management Practices ◽  
Management Practices ◽  
Management Practice ◽  
Storm Water ◽  
Aquifer Recharge ◽  
Detention Ponds ◽  
Filter Strips ◽  
Best Management ◽  
Separate Table ◽  
Porous Pavement

This article reviews and provides evaluation guidelines for six major storm water best management practices including bioretention areas, grassed swales/filter strips, infiltration trenches, porous pavement, rain barrels and wet detention ponds. A detailed table allows for quick and easy design comparisons, including a separate table which allows for site specific cost comparisons. A logic diagram is provided as a basic tool for screening the most feasible management practice.

Sign in / Sign up

Export Citation Format

Share Document