298 94 307/02 Untersuchungen zum Stand der Umsetzung des ...

Operational data Applicability
Economics
Driving force for implementation
Example plants
Teil 3 Seite 4-41
Corporate clarification plant of the Kraftisried animal carcass disposal plant, 87647
Unterthingau
Subsequent to mechanical/physical-chemical preliminary purification by means of fat
separators, cylindrical sieves and flotation, as well as a mixing and equalising basin, the
effluent is channelled into the activation basin. An anaerobic stage that existed previously
was discontinued.
The selected process represents an activation process under moderate load in large-
volume, foil-sealed earth basins (Biolak-W-Ox system by the company Von Nordenskjöld).
Aeration is carried out intermittently. The design of the plant entails full nitrogen elimina-
tion through simultaneous nitrification/de-nitrification. The dimensional and operating data
of the aerobic treatment stage have been compiled into Table 4-11.
Anaerob.
reactor
Bypass
Fermentation gas
C
yc
le
Bufferbasin
Supernatant
Return sludge Excess sludge
Flotation Cyl. sieve
Inflow
Outflow
Figure 4-6: Flow chart of the effluent treatment plant of the Kraftisried animal carcass dis-
posal plant
Table 4-11: Dimensional and operating data of the aerobic treatment stage at the Kraftis-
Total volumes, activation VBB
ried animal carcass disposal plan
VD/VBB ratio 0,33
Effluent inflow (homogenised) Qd
1.803 m 3
100 m 3 /d
Dry substance content in the activation basin TSBB 3,5 g/l