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Table 1 Design characteristics of the six digesters A-F

From: Characterization of sulfur oxidizing bacteria related to biogenic sulfuric acid corrosion in sludge digesters

Dg

Year of construction

WWTP PE

Digester volume [m3]

RT [d]

Operating temperature [°C]

Sulfate in drilling dust headspace [% w/w]

Sulfate in drilling dust sludge zone [% w/w]

A

1969

110,000

1,100

18

38

1.2

0.1

B

1974

83,000

1,150

25

37

0.5

0.4

C

1980

83,000

1,000

27

38

0.4

0.3

D

1990

30,000

2,000

35

40

n.d.a

n.d.a

E

1963

10,000

320

60

30–33

0.7

0.5

F

1982

94,500

2,100

35

39

0.6

0.2

  1. Dg Digester, WWTP PE Wastewater Treatment Plant Population Equivalent, RT Retention Time, anot determined