CVEN3502 - Workshop SOLUTION - Sludge management.pdf

# CVEN3502 - Workshop SOLUTION - Sludge management.pdf -...

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1 CVEN3502 Workshop Sludge management SOLUTIONS QUESTION 1 Calculate the volume of primary sludge produced per day from a town of population 100,000 with a per capita daily wastewater flow of 200L, an SS concentration of 300 mg/L and primary settlement tanks which remove 70 per cent of the suspended solids to give a sludge moisture content of 95 percent. SOLUTION Volume of water inflow: 100000*200 20000000 L/day Mass of solids inflow: *300 mg/L 6000000000 mg/day /10 6 6000 kg/day Mass of solids in sludge (Ms): *0.7 4200 kg/day Mass of water in sludge (Mw): (see below) 79800 kg/day 79800 L/day /1000 80 kL/day ൌ ൬ ൅ ࡹ P w (M w +M s ) = M w P w M w + P w M s = M w P w M w -M w = -P w M s M w (P w -1) = -P w M s M w =P w M s /(1-P w ) M w =(0.95*4200)/(1-0.95) QUESTION 2 (Mines, Chapter 7, Q43) Waste activated sludge contains 1% dry solids that are 80% volatile. Determine: a) The specific gravity ( S s ) of the dry solids b) The specific gravity ( S sl ) of the sludge c) The volume (m 3 ) of the thickened sludge if 60,000 kg of dry solids is thickened to 6% in a gravity belt thickener.

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