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

Timber, TIMBER Timber refers to wood utilized for construction works. A...

TIMBER Timber refers to wood utilized for construction works. Actually the word timber is derived from an old English word 'Timbrian' that means 'to build'. A tree that yields

Classification of timber, Classification of Timber Several bases are co...

Classification of Timber Several bases are considered for the classification of timbers. The following are the essential basis: Mode of growth Modulus of elasticity

Survey, Operation in chain surveying

Operation in chain surveying

Design of masonry, Describe the different types of Ant proof courses

Describe the different types of Ant proof courses

Raft foundation, after formation of the soil under raft some area around th...

after formation of the soil under raft some area around the lift pit for example will be on tipping shape and some column placed in the same area the question how we place the col

Construction of concrete carriageway, Question If construction of conc...

Question If construction of concrete carriageway is carried out in summer, be capable of expansion joints be omitted? Answer If construction of concrete carriageway

Determine the strain compatibility method, Determine the Strain Compatibili...

Determine the Strain Compatibility method For estimating the ultimate strength of prestressed concrete members in flexure, 'Strain Compatibility method' may be used. For calcul

Explain ductile iron pipes and mild steel pipes, Ductile iron pipes vs. mil...

Ductile iron pipes vs. mild steel pipes as pressurized pipelines For water main pipe size less than 600mm, ductile iron is generally used since internal welding for steel pipe

Haley''s formula in pile driving, Question What is major difference bet...

Question What is major difference between "hammer efficiency" and "coefficient of restitution" at what time using Haley's formula in pile driving?   Answer Hammer ef

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