1. IAWD Danube Water Conference 2019 Vienna, 20th May 2019
Cooperation between a utility and academia – the case of ebswien hauptkläranlage Ges.m.b.H. and TU Wien
Gerald Wandl (ebswien hauptkläranlage Ges.m.b.H.)
Jörg Krampe (TU Wien)
IAWD Danube Water Conference 2019 Vienna, 20th May 2019

2. Early Stages

3. Beginning of Wastewater Treatment
WWTP „Gelbe Haide ( )
WWTP „Blumental“ ( ) p.e.
1965 => Design Prof. v.d.Emde
(Techn. Hochschule Wien)

4. Main Wastewater Treatment Plant (MWTP)
1969 => Design Prof. v.d.Emde
Pilot Plant Operation Prof. Kroiß
(Techn. Hochschule Wien)
Capacity: 2.5 Mio p.e.
Start of Operation 1980
Investment 700 Mio. ATS (annualised approx. 150 Mio. Euro)
commissioned for 70% removal of organic compounds => due to ingenious design 85 % removal of organic compounds % removal of nitrogen

5. Pilotplant 1977

6. Water Quality in Vienna 1995

7. Rehabilitation Project 1996 (Wastewater Disposal & Water Protection for Vienna)
Extension of Sewer System
Implementation of Sewer Control System
Renaturation of Rivers
Extension of MWTP

8. Extension of MWTP Principal Design: Prof. Kroiß
Pilot Plant Operation: Prof. Svardal (TU Wien)
Capacity: 4.0 Mio. p.e .
Extended: 2000 – 2005
Start of Operation 2005
Investment: 220 Mio. Euro
95 % COD-Removal
85% Nitrogen-Removal
spec. aeration tank volume: 70 l/p.e. (conventional single stage: 140 l/p.e.)
=> tremendously reduced construction-costs

9. Pilotplant Extension 2000/2005

10. Impact of Plant Extension on Effluent Quality
Reduced effluent concentration after the extention
Limit value 10

11. Reduction of Wastewater-Emissions due to the Project for Water Protection

12. Impact of the extended MWTP on the Reduction of WWTP-Emissions in Austria
- 26%
- 27%
- 50% 12

13. Energy Optimisation Sludge Treatment
Current Project
EOS
Energy Optimisation Sludge Treatment

14. Parts of the Project EOS
1) Renewal of the primary clarification and the first biological treatment step
Construction of a new sludge treatment facility

15. EOS – Scientific Hypothesis (TU Wien)?
Standard
EOS-Study
Gas-Production ca 27
Liter, Gas/p.e.
Digester-Volume ca 21
Liter, Dig/p.e.
Sludge-Conc. Dig.-Inflow
ca. 4-5
ca. 7-8
% DS
Sludge-Conc. in Dig.
ca. 3
ca. 4
Ammonia-Conc. in Dig. ca
> 2.000
mg/l 15 15

16. Pilotplant EOS Operation TU Wien => predictions could be proved
Reduction of digester volume => significant reduction of construction-costs
High gas production => self-supply with electricity and heat is possible

17. Project EOS digesters 75.000 m³ sludge buffertank 4000 m³ mechanical
pre-thickening
20 t TS/h
gastanks m³
primary sedimentation m³
centrate water treatment m³
blower station
aeration tanks m³
intermediate pumping station
Comb. Heat & Power (CHP)
15 MWel
intermediate sedimentation m³
water line
sludge line

18. Results
Substitution of annually 78 GWh electricity and 82 GWh heat-energy
The entire energy demand of Vienna´s MWTP will be covered by a renewable energy source
results in a reduction of CO2-emissions in the range of 40,000 t/a
due to the reduced volume of purchased electricity
due to the reduction of the requirements for fuel surrogates in sludge incineration

19. Future Aspects / Reuse

20. Potential Reuse of the onsite Wastewater
Pilot scale investigations (~ 25,000 p.e.) on the further removal of organic trace compounds (e.g. hormones, pharmaceuticals, industrial- and household compounds, …) by
Ozonation
Activated carbon adsorption
In preparation of future EU & national regulations for
Reduction of input into aquatic environment by WWTP
Reuse of treated municipal ww for municipal reuse, if needed

21. Advanced Wastewater Treatment

22. Conclusions
Long term partnership between ebswien hauptkläranlage Ges.m.b.H. and TU Wien for mutual benefit
The existing MWTP is one of the largest and most efficient WWTPs in the world
ebswien gets access to latest technologies and developments
TU Wien has access to real life operation and challenges

23. Vienna – Worth Living