BVT-Merkblatt zu Abwasser- und Abgasbehandlung

Annexes
7.6 Annex VI. Examples of Waste Water and Waste Gas
Treatment
The following examples give data from effluent treatment plants currently operated in different
EU Member States. Their inclusion, however, does not automatically imply that all these plants
and their equipment are BAT. The BAT conclusions are detailed in Chapter 4.
7.6.1 Technical Information on Waste Water Treatment Plants (Examples)
[cww/tm/105]
Example I Example II
Production production mix, mainly organic production mix
Year of construction 1988 1978
Function tower biology plant with separate final
clarification for chemical waste water
treatment
tower biology with final clarification
Process steps
neutralisation
biological treatment
final clarification
Plant characteristics - buffer tank: V = 300 m 3
- neutralisation tank: V = 3.0 m 3
- 2 aeration tanks: V = 3000 m 3 each
- bottom hopper, diameter 14 m
equalisation
neutralisation
biological treatment
sedimentation
- 2 buffer tanks: V = 1500 m 3
- 1 buffer tank: V = 1700 m 3
- 3 neutralisation vessels: V = 25 m 3
each
- 6 biological treatment towers:
V = 1600 m 3 each, diameter 11 m
- 6 bottom hoppers: V = 112 m 3
each as final clarification
Sludge treatment dewatering before off-site incineration centrifuge
evaporation
combustion
Process data
Waste water flow [m 3 /d] 5280 3840
COD load [tonnes/d] 4.2 3
NH4-N load 0.2 0.3
BOD5 [tonnes/d] 1.75 1
organic N [tonnes/d] 0.15
NO3-N [tonnes/d] 0.5
PO4-P [tonnes/d] 0.005
Consumables
O2 input [tonnes/d] 12.0 6.8
Flocculants [tonnes/yr] 6 1.57
Nutrients [tonnes/yr] 1.18
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]
885 2581
38 105
- 1200
- 50718
1700 4750
- 17.6
Cross-media effect
Sludge [tonnes dry solids/d] 0.11 0.13
Sludge [kg dry solids per
tonne eliminated COD]
34
Performance data
118
a
waste water amount [m 3 /d] 4704 1882
COD elimination [%] 53 81
COD emission [mg/l]
a
daily mean average
616 132
Waste Water and Waste Gas Treatment 333