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 |