Handbook of Civil Engineering Calculations

TABLE

7.

Sludge

and

Other Products

of

Sewage-Treatment

Processes

per

Million Gallons

of

Sewage

Treated*

Trickling

filter

humustanks

Activated

sludge

Imhoff

or

separate

tanks

Treatment

process

Septic tanks

Plain

sedimentation

Grit

chambers

Fine screens

Racks

Data

Raw

sludge

500 gal(1892.5

L)

92.5^1025 Digestion

anddrying

Raw

sludge

13,500

gal

(51,098L) 99 1005 Processing,

digestion,orlagooning

Digested

sludge

500 gal(1892.5

L)

(^851040) Drying
Digested
sludge
900 gal(3406.5
L)
(^901040) Drying
Raw
sludge
2500
gal
(9462.5
L)
95 1020 Processing,
digestion,ordrying
Grit 2.5ft
3
(0.07
m
3 )
(^15) Filling
land
Screenings10-30 ft
3
(0.28-0.83
m3)
(^80) Burying,
burning,
or
digestingwith sludge
Screenings4-8
ft
3 (0.11-
0.23
m
3 )
80 Burying,
burning,
or
shreddingand
digestion
with sludge
Character
of
productAverage amountper
million
gallons
Average moisture
content,percent
Specific
gravity
Usual
disposal
methods
*O'Rourke
—
General
Engineering
Handbook,
McGraw-Hill.