Comparison of Bed Type Operations

Factor

Sludge Types

Freezing (All)

Reeds (Nontoxic)a

Freezing and Reeds (Nontoxic)

Worms (Organic Nontoxic)

Bed enclosure

None

None

None

Yes

Heat required

No

No

No

Yes

Initial solids (%)

1-8

3-4

3-8

1-4

Typical loading rate (kg/m2/yr)b

40c

60

50

<20

Final solids (%)

20-50d

50-90d

20-90d

15-25

Further stabilization

No

Some

Some

Yes

provided

Sludge removal

1

10e

10e

a Assumes year-round operation in a warm climate. b Annual loading in terms of dry solids. c Includes use of bed for conventional drying in summer. d Final solids amount depends on length of final drying period. e The vegetation is typically harvested annually.

frequency (yr)

a Assumes year-round operation in a warm climate. b Annual loading in terms of dry solids. c Includes use of bed for conventional drying in summer. d Final solids amount depends on length of final drying period. e The vegetation is typically harvested annually.

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