Aartselaar Aquafin water , Environmental water plant .
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Transcript of Aartselaar Aquafin water , Environmental water plant .
1
Waste Water Treatment Plant Case Study
Aartselaar Aquafin
MAIS AL JUBORI HANNES DECADT MOHAMMED HERZALLAH
April 2015
2Outline
Introduction
General Scheme of the WWTP
Description of the WWTP
Calculations
Problems and Possible Solutions
Conclusion
3Introduction Aquafin is a regional wastewater treatment company in
Flanders. Mission: expanding, operating and financing the sewage
treatment infrastructure in Flanders. responsible for the operation of 287 sewage treatment
plants distributed over the 5 provinces of Flanders. Each plant recives household wastewater collected from
the municipal sewers and treats it according to the European and Flemish standards.
Aquafin Aartselaar is one of these plants, located in province of Antwerp and serves the population of the zone Aartselaar and part of Wilrijk using the biological treatment.
5Description of the WWTP
A. Collectors and screw system
B. Sand traps
C. Selector, anaerobic and anoxic tank
D. Aeration tanks
E. Sedimentation tanks
F. Sludge handling
screw system
Sand traps
Selector tankAnaerobic tankAeration tank with surface aeratorSedimentation tank
F
A B C D E
6CalculationsNitrification-denitrification
Nitrification: NH4
+ O2 NO3-
Denitrification: NO3
- N2
Unaerated tanks Aeration tanks
Recycling
Selector
Anaerobic
Anoxic
Facultative aerated
Aerobic
7Calculations Phosphate removal
Growth P-uptake
Selector
Anaerobic
Anoxic
Facultative aerated
Aerobic
PHB formingP-release
Unaerated tanks Aeration tanks
Recycling
Qinf = 28875 m³/d
= 5962 m³/d
G
= 444 m³/d
TT
= 28818 m³/d=51788 m³/d
Xt = 70 kg/m³
= 28488 m³/d
= 22526 m³/d
= 22970 m³/d
Qtot = 57750 m³/d
Unaerated tanks 2500 m³
Aeration tanks 5600 m³
Settle tanks4242 m³
Xeff = 14.6 g/m³ X = 4 kg/m³
= 387 m³/d = 57 m³/d
Xw = 9 kg/m³
Qsi
Qr’
Qr
Qr+Qr’
Qreflow G+TT
Qt
Qso
Qw
Qeff
ΔX=4000 kg sludge/d
Calculations Flow scheme
12Problems and Possible Solutions
The high concentration of the suspended solids in the effluent
Poor nitrogen removal
- Improving NH4+-removal: longer sludge residence time
- Improving NO3--removal: recycling more or making the anoxic zone
larger
- Turn-off the paddlers of the aeration tanks to let the sludge settle down calmly
- Use of membranes
13Conclusion
Typical conventional activated sludge system with recycling for biological treatment of COD, nitrogen and phosphate
Removal efficiencies reach the actual quota, but can be bettered: The COD is removed properly Concentration of suspended solids has to be carefully followed
up Removal of nitrogen could be improved by more recycling Biological phosphate removal works satisfied