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Sludge cake weight calculation ,Urgent (Read 326 times)

Maryam Wastewater

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Sludge cake weight calculation ,Urgent
Jun 07^th, 2012, 1:30pm

Hi All,
I need to design a filter press for a treatment plant with capacity of 110.4 m3/day

I assumed that the sludge flow is 2% of the whole discharge so it will be around 2 m3/day
Weight of sludge in wet condition :1040 kg/m3

Percentage of dewatering of filter press is 30%

So the sludge cake weight per day will be :

1040*2*.03:62.4 kg Shocked

Is it correct ?
Thank you
Maryam

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Maryam Wastewater YaBB Newbies Offline I love Water and Wastewater.com Posts: 15 Gender: Company or Organization: Waterworks	Re: Sludge cake weight calculation ,Urgent Reply #1 - Jun 7^th, 2012, 1:44pm I was wrong Specific gravity of sludge :1.02 sludge cake : 2 m3/day 1.02.6=1.224 kg
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grrun God Member Offline WaterandWastewa ter.Com is the best! Posts: 3525 Pekin, IL Gender: Company or Organization: Freelance Environmental Engine	Re: Sludge cake weight calculation ,Urgent Reply #2 - Jun 8^th, 2012, 12:54am Close enough for a quick and dirty estimate; but you probably should use 0.7 for a factor rather than 0.6. grrun
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Geoff

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Re: Sludge cake weight calculation ,Urgent
Reply #3 - Jun 13^th, 2012, 5:06am

Not sure I agree with the figures.

A plant typically produces 150mg/L sludge so for an inflow of 110m3/d that equals about 16.5kg/d sludge production.

If you're wasting as mixed liquor (say 3500mg/L) that means you'll waste about 5m3/d. Wasting as settled solids gives about 2.5m3/d.

So you need to know how you'll waste sludge.

16.5 kg DS = 16.5 x 100/30 = 55kg/d at 30% solids.

30% sounds very optimistic. 13 - 16% is typical regardless of what the sales people tell you.

16.5 kg DS = 16.5 x 100/15 = 110kg/d at 15% solids.

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