BVT-Merkblatt zu Abwasser- und Abgasbehandlung

Example III Example IV
Sludge [kg dry solids per
tonne eliminated COD]
720
Performance data
620
b
waste water amount [m 3 /d] 148615 12269
COD elimination [%] 87 91
COD emission [mg/l]
a
off-gas thermal treatment
107 106
b daily mean average
Annexes
Example V Example VI
Production production mix, mainly organic production mix, mainly organic
Year of construction 1977 1974-76
Function waste water treatment for chemical
production plants
denitrification and biological treatment
Process steps
neutralisation
pre-clarification
denitrification
biological treatment
final clarification
flotation
cooling
sludge treatment
Plant characteristics - neutralisation: V = 220 m 3 /
V = 110 m 3
- pre-clarification: V = 1000 m 3
- 2 denitrification basins:
V = 1500 m 3 each
- 2 aeration basins: V = 2500 m 3 each
- 2 bottom hoppers, diameter 14 m
each
Sludge treatment thickener
polyelectrolyte conditioning
centrifuge
sludge drying
Process data
neutralisation
pre-clarification
denitrification
final clarification
biology
- neutralisation: V = 380 m 3
- 4 pre-clarification tanks:
V = 750 m 3 each
- 3 buffer basins: V = 9100 m 3
- aeration basin/denitrification:
V = 28000 m 3 each
- 16 clarification tanks, diameter 15 m
pre-thickening by separators
dewatering of excess and other sludge
landfilling
Waste water flow [m 3 /d] 8500 60000
COD load [tonnes/d] 17.5 60
NH4-N load 0.96
BOD5 [tonnes/d]
9.55
organic N [tonnes/d] 0.45
NO3-N [tonnes/d]
PO4-P [tonnes/d]
1.9
Consumables
O2 input [tonnes/d] 16 15-20
Flocculants [tonnes/yr] 196.2 17
Nutrients [tonnes/yr] 7.71 91
Electricity WWTP
[MWh/yr]
Electricity sludge treatment
[MWh/yr]
Steam WWTP
[tonnes/yr]
Steam sludge treatment
[tonnes/yr]
Compressed air WWTP
[1000 Nm 3 /yr]
Compressed air sludge treatment
[Nm 3 /yr]
4204 1163
625 3882
36 641
2380 120
356 337
39.5 166
Cross-media effect
Sludge [tonnes dry solids/d] 1.83 103
Sludge [kg dry solids per
tonne eliminated COD]
150
Performance data
2000
a
waste water amount [m 3 /d] 8616 61359
COD elimination [%] 84 87
COD emission [mg/l]
a
daily mean average
255 120
Waste Water and Waste Gas Treatment 335