IJIFR VOLUME 3 ISSUE 12 AUGUST 2016

ISSN: 2347-1697
International Journal of Informative & Futuristic Research (IJIFR)
Volume - 3, Issue -12, August 2016
Continuous 36 th Edition, Page No: 4626-4649
materials. The assemble model is shown in the Fig.11. Before a final design of the water filter
was created, it was necessary to ensure that the filter works as described. Several filters
models were made to determine the filter effectiveness and flow rate using different concepts
and flow paths. The first step in designing the filter is to determine the seating space provided
for the equipment in most of the locations. The targeted locations allowed a maximum lateral
space of 1000mm and longitudinal space of 2000mm. Since the pipe fitting for water inlet and
outlet with flush system and oil elements discharge is to be spaced with in the allowed
volume of seating chamber, the filter body has to be slender but sizeable enough for the
process to occur inside.
The second step of the design is to evaluate the pipe diameter to facilitate the flow rate of
inflow as well as the out flow of the filtered water without building up the pressure even
during the peak loads that can exceed the allowable pressure capacity of the pipe as well as
the body material. The calculation of the pipe diameter with respect to rate of discharge fairly
allows the designer to even determine the material of the pipe that is to be selected and the
space requirements of the pipe as well. The next tread level in designing the filter is the most
important aspect of the entire process, i.e., establishing the flow path of the storm water with
in the space of the filter. This step is done in two parts. In the first, the behavior of the
suspended and quick settling particles is scrutinized when subjected to hydrodynamic forces
in vortex direction. The particles behavior is studied with iterations in speeds and flow rate
values of water vortices in a transparent container. This study is utilized for determining the
dimension of the space required for hydrodynamic flow in the filter body and that of the hole
that is to be provided for silt trap funnel. In the second part the loading factor for filter media
is evaluated with varying amounts of suspended particles. This is to decide on the surface area
of the filter media to be provided to meet the targeted value of filtration without resuspending
the particles during high loads.
A cumulative decision is made after studying both parts of the third step of designing. This
results in precise dimensions that are to be provided to the body and the filter chamber where
the filter media is located. It also gives a solution to the flow path of the water, where the
hydrodynamic vortex flow occurs exterior to the filter chamber and the later the water enters
the filter chamber from bottom; also called up-flow.For the water to flow in a vortex direction
smoothly even during lowest flow rates, fin like protrusions spiraling towards the bottom is
provided inside the hydrodynamic flow space. Each of the spiraling fins is designed with
precise horizontal orientation in the top end (starting edge) to gradual inclination towards
upside at the bottom edge. These fins not only direct the water to the bottom portion of the
filter but the gradual inclination in them foster the oil/grease elements to surface. They act as
parallel plate coalesce typically used in oil water separators of conventional models.
The filter chamber is designed in a fashion with a smaller entry area than the lateral area of
the chamber to provide a smaller entry point for the water and prevent the heavier sediment
particles to enter in it. This also provides larger volume for the vortex base of the
hydrodynamic flow which enhances the trapping capacity of the sediment particles.
S.V.Tarun, G.M.Swamy :: Design And Development Of
Hydrodynamic Vortex (Up-Flow) Pretank Rainwater Filter
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