BVT-Merkblatt zu Abwasser- und Abgasbehandlung

Annexes
Example VII Example VIII
Production production mix, mainly organic production mix, organic
Year of construction 1977 1977/78
Function waste water pretreatment of central
WWTP, 2-stage waste water treatment
existing of biological treatment with
simultaneous precipitation of phosphate
and nitrification in a closed plant
Process steps rake screen
neutralisation
pre-clarification
biological treatment
intermediate clarification
nitrification
final clarification
Plant characteristics
- 2 neutralisation tanks: V = 380 m 3
- 4 pre-clarification: V = 750 m 3 each
- 3 buffer basins: V = 9000 m 3 each
- 2 aeration basins: V = 5600 m 3 each
- 1 intermediate clarifiers: diameter
20 m, surface area 300 m 2
- 2 final clarifiers: diameter 20 m,
surface area 300 m 2
Sludge treatment excess sludge pumped to sludge dewatering
waste water treatment for chemical and
pharmaceutical production plants
rake screen
buffering, equalisation
neutralisation
biological stage 1 (with pure oxygen)
intermediate clarification
biological stage 2
final clarification
- neutralisation: V = 50 m 3
- 2 buffer tanks: V = 4000 m 3 each
- 2 aeration basins: V = 3100 m 3 each
- 1 intermediate clarifier: V = 4400 m 3
- 2 aeration basins: V = 1600 m 3 each
- 2 final clarifiers: V = 2400 m3
excess sludge treated externally
Waste water flow [m
Process data
3 /d] 8000 20000
COD load [tonnes/d] 15 60
NH4-N load 1.5 0.1
BOD5 [tonnes/d]
organic N [tonnes/d]
34
NO3-N [tonnes/d] 1.5
PO4-P [tonnes/d]
0.2
Consumables
O 2 input [tonnes/d] 30 60
Flocculants [tonnes/yr] 2.1
Nutrients [tonnes/yr] 37.5 12
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 Nm 3 /yr]
Compressed air sludge treatment
[Nm 3 /yr]
6200 5155
675
2323
3261
Cross-media effect
Sludge [tonnes dry solids/d] 3.75 3.08
Sludge [kg dry solids per
tonne eliminated COD]
340
Performance data
300
b
waste water amount [m 3 /d] 5344 3549
COD elimination [%] 83 98
COD emission [mg/l]
a
off-gas thermal treatment
411 56
b daily mean average
336 Waste Water and Waste Gas Treatment