Typical Solids Content from Treatment Operations

Typical Dry Solids

Percent

Treatment Operation (%)a Primary Settling

Primary only 5

Primary and waste-activated sludge 1.5

Primary and trickling-filter sludge 5 Secondary Reactors Activated sludge:

Pure oxygen 2.5

Extended aeration 1.5

Trickling filters 1.5 Chemical Plus Primary Sludge

Iron salts 7.5 Thickeners Gravity type:

Primary sludge 8

Primary and waste-activated sludge 4

Primary and trickling filter 5

Flotation 4

Digestion

Anaerobic:

Primary sludge 7

Primary and waste-activated sludge 3.5 Aerobic:

Primary and waste-activated sludge 2.5

a Percent solids in liquid sludge. b kg/103 m3 = dry solids/1000 m3 liquid sludge.

Source: Metcalf & Eddy, Wastewater Engineering: Treatment, Disposal, and Reuse, 3rd ed., McGraw-Hill, New York, 1991. With permission.

150 45 150

130 100 70

800 300 600

140 70 90 70

210 105

0 0

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