What is rapid sand filter, Civil Engineering

Assignment Help:

Q. What is Rapid Sand Filter?

A Rapid Sand Filter is a water treatment plant that includes provision for pre treating the water by coagulation and sedimentation for settlement of suspended solids before filtration with sterilization in the final process.

Rapid Sand Filter consists of layers of course sand with an effective size of 0.35 to 0.50 mm is used. The depth of sand layer is 0.60 to 0.75m. This sand is supported on a gravel layer of depth 0.45m in 5 to 6 layers. The effective size of gravel is 2 to 50 mm. Gravel is under by an under drainage system consisting CI central manifold with strainers & lateral.

Plan area of these tank s is 10 to 80 m2 or 6 x 8 m or 8 x 10 m. Rate of filtration of these filter is 3000 to 6000 Lit. /hrs/ m2. The cleaning of Rapid Sand Filter is effected by reversal flow. First air is passed at the rate of 600 - 900 lpm/ m2 at the pressure of 0.35 kg/cm2 for 5 minutes in the reverse direction. After this water is passed which removes the dirt by bubbling action. Water required for back wash 300 to 900 Lit. / hrs/ m2. Cleaning must be done after every 1 to 3 days.


Related Discussions:- What is rapid sand filter

Highway, what is the difference between bitumin and asphalt

what is the difference between bitumin and asphalt

Concrete, what is the heat of hydration and gel space ratio?

what is the heat of hydration and gel space ratio?

Determine the major and minor principal effective stresses, The stresses ac...

The stresses acting on the plane of maximum shearing stress by a given point in sand are as follows: total normal stress = 250 kN/m 2 ; pore-water pressure = 88.5 kN/ m 2 ; shearin

Soil in road construction, Soil in Road Construction: Road Embankme...

Soil in Road Construction: Road Embankment and Sub-grade Soil is mainly used as the material for constructing a road embankment. The road embankment supports the road

Surveying, how to make plain scale

how to make plain scale

Design of flexural members, Design of Flexural Members: Here you have ...

Design of Flexural Members: Here you have learnt how to design simple steel beams of rolled steel sections subjected to transverse loading. You have also known how to take

Importance of racking load for a pre-stressed concrete beam, Importance of ...

Importance of racking load for a pre-stressed concrete beam Evaluation of cracking load for a pre-stressed concrete beam member is important for the following cases/reasons.

Explain the statements about construction contract process, Explain the Sta...

Explain the Statements about the Construction Contract Process I. Surety bond assures the project owner a guarantee of funds equivalent to a promissory note. The surety bond is

Doors, what is door and window sizes

what is door and window sizes

Obstacles, Obstacles which can be ranged

Obstacles which can be ranged

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd