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Sand Filter Design (Read 223 times)

jugalrana YaBB Newbies Offline I love Water and Wastewater.com Posts: 5 Company or Organization: Rochem Separations	Sand Filter Design Apr 19^th, 2012, 9:42am Dear all, Can anybody tell me how to design a sand filter on basis of TSS load.
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hussein

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Re: Sand Filter Design
Reply #1 - Apr 19^th, 2012, 12:37pm

Dear jugalrana,

What type of the treatment plants you have? is it sea water or brackish water or conventional treatment plant? and which type of sand filters "is it pressure or gravity"?

Normally, i design the sand based on the flux (filtration rate) which is the (inlet flow rate / filtration area). As per Metcalf & Eddi book the filtration rate range (80 - 320 L/m2.min). From my good engineering practice shows that the filtration rate range (8-12 m3/h.m2) as a rule of thumb.

For removing the suspended solid through the filter, the considered filtration rate up to 240 L/m2.min "Ref. Metcalf & Eddi book"

Hussein

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Re: Sand Filter Design
Reply #2 - Apr 21^st, 2012, 3:41am

I use 5 GPM/ft2 flux in designing sand filter. So if you're required flowrate is, say, 5 GPM, the surface area of your sand bed is 1 ft2.

Height of sand bed must not be less than 36 in. Sand Filter Tank should have space at least 40% of sand bed height to allow for expansion during backwash.

Sand filtration is a frequently used very robust method to remove suspended solids from water.

The filtration medium consists of a multiple layer of sand with a variety in size and specific gravity.
Applications for sand filtration:

Preperation of cooling water
Treatment of waste water
Production of drinking water
Filtration in swimming pools
Pre filtration for membrane systems
Filtration of grey or surface water
Removal of iron

A sand filter has a dirt holding capacity of 3 to 6 kg TSS / m2 of sand surface.

Read more: http://www.lenntech.com/sandfiltration.htm#ixzz1sewpcZZ8

Also please visit my blogs I have articles there related to ion exchange, RO and other water treatment methods. I always update my blogs for new articles/references. Kindly leave comments and/or questions.

http://aquarianph.blogspot.com/
http://iexbasic.blogspot.com

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