system-wide benchmark simulation model for integrated
TRANSCRIPT
System-wide Benchmark Simulation Model for
integrated analysis of urban wastewater
systems
Ramesh Saagi1, Xavier Flores-Alsina2, Krist. V. Gernaey2, Ulf Jeppsson1
1 Division of Industrial Electrical Engineering and Automation (IEA), Lund University, Sweden2 Department of Chemical and Biochemical Engineering, Technical University of Denmark (DTU), Denmark
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Outline
1. Objective
2. The urban wastewater system (UWS)
3. Modelling the UWS– Catchment
– Sewer network
– WWTP
– Receiving water
4. Evaluation criteria– River quality based evaluation
5. Results
6. Conclusions
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Objective
• Spatial extension to plant-wide BSM
“Outside the fence” of WWTP
• River quality based evaluation
• Benchmarking of integrated control strategies
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Modelling the UWS - Catchment
CODsol CODpart NH4 NO3- PO4
- Flow rateStates
subcatchment Area (ha) PEDWF (m3/d)
Infiltration (m3/d)Storage tank volume (m3)
Domestic Industrial
1 99 15,920 2,390 700 5500
2 21 3,920 590 2,500 150 1000
3 29 2,960 440 200 2000
4 71 9,600 1,440 500 4000
5 71 7,840 1,180 1,600 4000
6 249 39,760 5,960 1,700 15000
Total 540 80,000 12,000 2,500 4850 31500
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Modelling the UWS - Catchment
Generation of wastewater
• Domestic
• Industrial
• Stormwater
• Infiltration to sewers
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Modelling the UWS – Sewer system
• Sewer transport – Linear reservoir model
• First flush model for particulate pollutants
• Storage tank models
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Biology (RWQM1)
• 18 state variables
– Organics, biomass, oxygen, nitrogen, phosphorus
• 17 processes
– Heterotrophs, Autotrophs, Algae
– Hydrolysis
– Phosphate processes
Length of each stretch-1kmTotal river length-30km
Hydraulics
Modelling the UWS – River
8 m
14 m
3 m
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Evaluation criteria
River quality based evaluation
• Total exceedance duration
– NH4
– DO
10
NH
4(g
/m3)
hoursDO
(g/m
3)
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Evaluation criteria
River quality based evaluation
• 1-hour max/min conc.
– 1-hour max. NH4 conc.
– 1-hour min. DO conc.
11
NH
4(g
/m3)
hoursDO
(g/m
3)
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Results - CatchmentDomestic Industry
Infiltration Rain
0 90 180 270 3650
200
400
600
800
1000
Time (days)
Flo
w r
ate
(m
3/d
)
100 102 104 106 108 1100
1
2
3
4
5x 10
4
Time (days)
Flo
w r
ate
(m
3/d
)
100 102 104 106 108 1100
1000
2000
3000
4000
5000
Time (days)
Flo
w r
ate
(m
3/d
)
100 102 104 106 108 1100
500
1000
1500
2000
Time (days)
Flo
w r
ate
(m
3/d
)
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Sewer transport – Linear reservoir model
First flush model for particulate pollutants
Results – Sewer system
1 1.2 1.4 1.6 1.8 20
0.5
1
1.5
2x 10
4
Time (days)
Flo
wra
te (
m3/d
)
Inflow
Outflow k=15 min
Outflow k=30 min
Outflow k=300 min
1 1.2 1.4 1.6 1.8 20
0.5
1
1.5
2x 10
4
Time (days)
Flo
wra
te (
m3/d
)
Inflow
n=1
n=2
n=3
n=4
270 271 272 273 274 2750
1000
2000
3000
Time (days)
CO
Dp
art a
ccu
mu
late
d (
kg
)
270 271 272 273 274 2750
2
4
6x 10
4
Time (days)
CO
Dp
art lo
ad
(kg
/d)
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Online storage Offline storage
172 173 174 175 176 177 1780
1
2
3
4
5x 10
5
Time (days)
Flo
wra
te (
m3/d
)
inflow
throttle
overflow
172 173 174 175 176 177 1780
1
2
3
4
5x 10
5
Time (days)
Flo
wra
te (
m3/d
)
inflow
throttle
overflow
Results – Sewer system
Storage tanks
Online tanks with valves
Offline tanks with pumps
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166 166.2 166.4 166.6 166.8 1676
6.5
7
7.5
8
8.5
9
Time (days)
DO
co
nc. (g
/m3)
stretch1
stretch2
stretch3
168.5 169 169.54
5
6
7
8
9
Time (days)
DO
co
nc. (g
/m3)
stretch1
stretch2
stretch3
166 166.2 166.4 166.6 166.8 1670
0.5
1
1.5
2
2.5
Time (days)
NH
4 c
on
c. (g
/m3)
stretch1
stretch2
stretch3
168.5 169 169.50
0.5
1
1.5
2
2.5
3
3.5
Time (days)
NH
4 c
on
c (
g/m
3)
stretch1
stretch2
stretch3
Ammonia variation is generally straightforward
DO variation is highly dynamic and depends on various factors
Results - River
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Conclusions
• System-wide extension to BSM2
• Wastewater generation in the catchment
• Sewer transport model with storage tanks
• Biochemical model for simulation of river dynamics
• River quality based evaluation of control strategies
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Thank you!
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The research leading to these results has received funding from the People Program (Marie
Curie Actions) of the European Union’s Seventh Framework Programme FP7/2007-2013 under
REA agreement 289193.
This presentation reflects only the author’s views and the European Union is not liable for any
use that may be made of the information contained therein.