Encyclopedia of Environmental Science and Engineering, Volume I and II

1202 URBAN RUNOFF

TABLE 28

Summary of typical biological CSO treatment installations

Project location

Type of biological

treatment

Tributary

area

Design capacity

(Mgal/d)

Major process

components No. of units Total size

Period of

operation

Kenosha, WI Contact

stabilization

1,200 20 Contact tank 2 32,700 ft^3 1972–75

Stabilization tank 2 97,900 ft^3

Milwaukee, WI Rotating biological

contractors

35 0.05* 3-ft diameter RBC

units

24 28,300 ft^3 1969–70

Mount Clemens, MI

Demonstration

system

Treatment lagoons

in series with

recirculation

between storms

212 1.0† 1

1

1

750,000 ft^3

1,100,000 ft^3

930,000 ft^3

1972–75

Citywide full-

scale system

Storage/treatment

lagoons in series

with recirculation

between storms

1,471 4.0† 1 4,440,000 ft^3 Under

construction

1 508,000 ft^3

Storage/aerated

lagoon

1 1,100,000 ft^3

1 922,000 ft^3

Oxidation lagoon

Aerated lagoon 1 36-ft diameter

Aerated lagoon

Aerated storage

basin

1 65-ft diameter

Aerated lagoon

Oxidation lagoon

Aerated/oxidation

lagoon

New Providence, NJ Trickling filters 6.0 High-rate plastic

media

1 36-ft diameter 1970–

High-rate rock

media

1 65-ft diameter

Shelbyville, IL Treatment lagoons

Southeast site 44 28 Oxidation lagoon 1 255,600 ft^3 1969–

Southwest site 450 110 Detention lagoon

plus 2-cell

facultative

lagoon

1 2,782,700 ft^3 1969–

Springfield, IL Treatment

lagoon

2,208 67 Storage/oxidation

lagoon

1 5,330,000 ft^3 1969–

TABLE 29

Typical wet-weather BOD and SS removals for

biological treatment processes

Expected range of pollutant removal, %

Biological treatment process BOD COD

Contact Stabilization 70–90 75–95

Trickling Filters 65–85 65–85

RBC* 40–80 40–80

*^ Removal reflects low ranges from 30 to 10 times dry weather flow

(EPA-600/8-77-014).

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