internship defense
TRANSCRIPT
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Internship defense: Central Storage Sewer
Michiel Lecomte
2nd Master of Bioscience Engineering: Environmental Technology
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Sewer system Graz
• RW-conditions: 96 combined sewer overflows
?
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Central Storage Sewer
• 10 km• > 100 000 m³ storage capacity
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Central Storage Sewer
• Mike Urban
• Mike View
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Central Storage Sewer
• Lowest cost through scenario analysis– Connection pipes– Depth and slope
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Central Storage Sewer• Scenario analysis:
– + 0.5 m, + 1.0 m, 0.18% slope, 2 slopes, + 0.6 m– 10 EUR/m³ soil– ca. 97290 EUR construction costs saved
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Reduced model
Big model Reduced model
3 h inputfiles (BC)
Design storm of 4h, return period = 100 years
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Improved reduced model
Time series of flow rates
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Energy balance (short)
• Central Storage Sewer:– 0-12000 m³: 0.02334 kWh/m³– >12000 m³: 0.006280 kWh/m³
• WWTP (2013):– Total energy needed: 12 936 256 kWh– Biogas energy produced: 9 390 834 kWh– Archimedes screw : 425 003 kWh produced– Balance: 3 120 419 kWh needed
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Conclusions
• Design ZSK: connection pipes and distance below ground level changed
• Improved reduced model: starting point for further optimisation
• Archimedes screw: 63750 EUR/y• Biogas: 72.6% of total energy needs
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Questions?
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Nash Sutcliffe Efficiency
• Goodness of fit of hydrological model
• = individual observed values (day i)• = individual modelled values (day i)• = mean of observed values
• E: -∞ 1(McCuen et al. 2006)
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Intensity Duration Frequency
• Frequently used• Probability of occurance of average rainfall
intensity
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Pump 1 WWTP