BVT-Merkblatt zu Abwasser- und Abgasbehandlung

Annexes
Example III Example IV
Production
production mix: large volume and fine
chemicals, organic and inorganic
Year of construction 1972-74, expansions 1979, 1981, 1985-6 1978, expansion 1994, 1999
Function tower biology as high load and tank biology
as low load treatment
tower biology with final clarification
Process steps rake screen
rake screen
neutralisation
neutralisation
pre-clarification
pre-clarification
buffering, equalisation
buffering, equalisation
part denitrification
biological stage 1
biological stage 1 with intermediate clari- biological stage 2
fication
final clarification
biological stage 2 with final clarification
flotation
off-gas treatment
sludge treatment
sludge treatment
Plant characteristics - neutralisation: V = 628 m 3
- 8 pre-clarifiers industrial: V = 480 m 3
each
- 2 pre-clarifiers municipal: V = 1950 m 3
each
- 3 buffer tanks: V = 10000 m 3 each
- 2 buffer tanks: V = 25000 m 3 each
- 1 buffer tank: V = 15000 m 3
- 1 denitrification tank: V = 10000 m3 - 4 tower biology: V = 13000 m 3 each
- 4 intermediate clarifiers: V = 1000 m 3
each
- aeration basin 1: V = 11000 m 3
- aeration basin 2: V = 25000 m 3
- 6 bottom hoppers: each
V = 1520 m 3 , diameter 18 m
- 4 bottom hoppers: each V = 1520 m 3 - neutralisation: V = 600 m
,
diameter 20 m
- 3 secondary clarifiers
- 2 flotation tanks: diameter 12 m
3
- 1 buffer tank: V = 15600 m 3
- 1 aeration tank: V = 5000 m 3
- 1 aeration basin: V = 5500 m 3
- 4 aeration basins: V = 2000 m 3 each
- 3 clarification basins: V = 3500 m 3 ,
diameter 40 m each
Sludge treatment thickener
sludge thickener
lime- and iron conditioning
mechanical dewatering with membrane
filter presses
sludge combustion
2 filter presses
Waste water flow [m
Process data (industrial / municipal part)
3 /d] 65000 / 65000 (dry weather)
65000 / 180000 (rainy weather)
18000
COD load [tonnes/d] 150 / 40 26
NH4-N load 3 / 2.5 0.6
BOD5 [tonnes/d] 80 / 20 8
organic N [tonnes/d] 5 / 1
NO3-N [tonnes/d] 3 / - 2.1
PO4-P [tonnes/d] 1.6 / 0.8
Consumables
0.07
O 2 input [tonnes/d] 180 (tower biology) / 30 (tank) 20
Flocculants [tonnes/yr] 50 360
Nutrients [tonnes/yr] 10.6
Electricity WWTP
[MWh/yr]
Electricity sludge treatment
[MWh/yr]
Electricity exhaust air treatment
[MWh/yr] a
Steam WWTP
[tonnes/yr]
Steam sludge treatment
[tonnes/yr]
Compressed air WWTP
[1000 Nm3 /yr]
Compressed air sludge treatment
[Nm 3 /yr]
39558 4320
3644 145
2812
4241
3
199459
3220
Cross-media effect
Sludge [tonnes dry solids/d] 77.25 7.9
334 Waste Water and Waste Gas Treatment