biocos meusel_sbr
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D e p a r
t m e n
t o
f C i v i l E n g
i n e e r i n g
Bauhaus-Universit Weimar
D i p l . - I n g .
S t e n
M e u s e l
Sludge Settling Processes in SBR-SewageTreatment Plants
According to theBiocos-Method
Dipl.- Ing. Sten Meusel
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Forecast
Peculiaritiesof the sludge sedimentation
andproblematic operating conditions
observed inthree-phase-Biocos-plants
Peculiaritiesof the sludge sedimentation
andproblematic operating conditions
observed in
three-phase-Biocos-plants
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D e p a r t m e n
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Bauhaus-Universit Weimar
D i p l . - I n g .
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M e u s e l
Outline
1. Motivation of Investigation
2. Methods and Material
3. Results4. Summary
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Bauhaus-Universit Weimar
D i p l . - I n g .
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1. Motivation of Investigation
Few availableempirical data
about sludgesettling processes
in Biocos-plants
Few availableempirical data
about sludgesettling processes
in Biocos-plants
Improvement of the Biocos-method
concerning theoperatingefficiency
Improvement of the Biocos-method
concerning theoperatingefficiency
Bauhaus-University
Weimar
Bauhaus-University
Weimar
Company of Biocos-plantconstructions
Company of Biocos-plantconstructions
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2. Methods and Material
SU 2 SU 1
Biological reactor
WWTP Buchbach(Capacity 1,200 PE)
WWTP Buchbach(Capacity 1,200 PE)
Q in= 0...5 L/s or 10 L/s
Design MLSS B = 5 g/L
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M e u s e l Q out
2. Methods and Material
Mixing phase U (15 min)Mixing phase U (15 min)
Q in
Longitudinal Section
Plan View
B SU 1
B
SU 1
SU 2
Q in
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M e u s e l Q out
2. Methods and Material
Settling phase V (45 min)Settling phase V (45 min)
Q in
Longitudinal Section
Plan View
B SU 1
B
SU 1
SU 2
Q in
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Qout
Qout
2. Methods and Material
Discharge phase A (60 min)Discharge phase A (60 min)
Q in
Longitudinal Section
Plan View
B SU 1
B
SU 1
SU 2
Q in
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2. Methods and Material
Focal points of the investigations in the SU-reactor:
Definition of the sludge level courses Definition of the solid distribution
Measuring instrument:
Infrared light turbidity sensor ( CUC 101, Endress+ Hauser) Total solids (TS) in g/L
Arrangement of measurement points (Units in m):
Length = 8.0 m
Width = 3.5 mMax water depth = 4.5 m
l
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3. Results
Sludge levels during the Settling phase V:
Time during V-phase [min]
Calculated sludge settling rates (SSR):
0
0,5
1
1,5
2
2,5
3
3,5
4
250 300 350 400 450 500 550 600Vergleichsschlammvolumen VSV [ml/l]
A b s e t z g e s c h w i n d i g k e i t [ m / h ]
Merkel (1971)
Resch (1981)
ATV-M 210 (1997)
Kayser (1995)
Absetzgeschwindigkeiten der Profillufe
Absetzgeschwindigkeiten der manuellenMessungen
250 300 350 400 450 500 550 600Sludge volume SV30(SU) [mL/L]
Merkel (1971)
Resch (1981)
ATV-M 210 (1997)
Kayser (1995)
Measured settlingrates
MLSSSU
= 5.54 g/L SV 30,SU = 510 mL/L
MLSS SU = 5.04 g/L SV 30,SU = 440 mL/L
MLSS SU = 4.79 g/L SV 30,SU = 410 mL/L
MLSS SU = 4.05 g/L SV 30,SU = 370 mL/L
0 5 10 15 20 25 30 35 40 45
43.5
3
2.52
1.51
0.50
S l u d g e s e
t t l i n g r a
t e
[ m / h ]
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4 D e p
t h o
f s l u d g e
l e v e
l [ m
]
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3 R lt
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3. Results
Longitudinal profiles of the solid matter distribution in the SU-reactor
V-phase(after 45 min)
V-phase(after 45 min) MLSS SU = 5.3 g/LMLSS SU = 4.1 g/L
0 0.5 1.51 2.52 3.53 4.54 5.55 6.56 7.57 8
52 8
1
4.5
4
3
3.5
2.5
1.5
2
0.5
0
Klarwasserzone
TS= 0
Absetzzone
1 2 3 4 5 5.25 6
Eindickzone
7 8 9 1110 12 13 g/l
0
1
2
3
4
0 1 2 3 4 5 6 7 8[m]
Clear water zone
Separationzone
Compressionzone
TS = 0 1 2 3 4 5 5.25 6 7 8 9 10 11 12 13 [g/L]
40 210.5 1.5 32.5 3.5 54.5 5.5 6.56 7.57 8
2
2.5
4.5
4
3
3.5
1
2
1.5
0.5
0
5 9
TS= 0 1 32 4
Klarwasserzone Absetzzone Eindickzone
75.285 6 8 9 10 13 g/l1211
0
1
2
3
4
0 1 2 3 4 5 6 7 8[m]
Clear water zone
Separationzone
Compressionzone
TS = 0 1 2 3 4 5 5.28 6 7 8 9 10 11 12 13 [g/
Break pointconcentration
Break pointconcentration
3 R lt
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3. Results
A-phase(after 55 min)
A-phase(after 55 min) MLSS SU = 5.3 g/LMLSS SU = 4.1 g/L
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
2 5
4
7.5 8
4.5
2.5
3.5
3
2
1.5
8
0.5
1
0
10 0.5
2
87.576.565.554.543.532 2.51.5
0
0.5
1
2
2.5
1.5
3
4
3.5
4.5
5 9
Klarwasserzone
TS= 0
Absetzzone
1 2 3 4 5 5.25 6
Eindickzone
7 8 9 1110 12 13 g/l
0
1
2
3
4
0 1 2 3 4 5 6 7 8[m]Clear
water zone
Separationzone
Compressionzone
TS = 0 1 2 3 4 5 5.25 6 7 8 9 10 11 12 13 [g/L]TS= 0 1 32 4
Klarwasserzone Absetzzone Eindickzone
75.285 6 8 9 10 13 g/l1211
0 1 2 3 4 5 6 7 8[m]Clear
water zone
Separationzone
Compressionzone
TS = 0 1 2 3 4 5 5.28 6 7 8 9 10 11 12 13 [g/L
0
1
2
3
4
3 Results
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3. Results
Concentration interchange of the Mixing phase U
Problems of concentration
equalisation measured
(MLSS SU > MLSS B)
Problems of concentration
equalisation measured
(MLSS SU > MLSS B)
B S
U
Internal sludgecirculation in the SU-
reactor
Internal sludge
circulation in the SU-reactor
Interchanging rate of the recirculation pump
= 1.2 SU-reactor content
MLSS B 4 g/L
Difference atboth inflow
types
MLSS B 5 g/L
Difference onlyduring storm
water inflow
3 Results
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3. Results
Four-phase-Biocos-methodMixing phase + Sludge recycle phase
Four-phase-Biocos-method
Mixing phase + Sludge recycle phase
Q out
Q in
Longitudinal Section
Plan View
B SU 1
B
SU 1
SU 2
Q in
Sludge recycling pumpSludge recycling pump
4 Summary
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4. Summary
Results of investigation:Results of investigation:
2. During the Discharge phases:Sludge levels depending on the difference between
sludge settling rate and surface overflow rateSolid matter distribution comparable to layer formations insecondary clarifiers with vertical flow
1. During the Settling phases: Almost linear sludge level decreases depending on sludge volum Settling processes analogue to well-known hydraulically uninterrupted settling processes
Intention of investigation:Intention of investigation:
Determination of solid matter distribution and sludge levelduring the Settling and Discharge phases
3. Problematic concentration interchange during theCirculation phases Four-phase-Biocos-method
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Backup slide 1
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Backup slide 1
Measuring instrumentMeasuring instrument
Microprocessor with display
Stepper motor
Cable drum
Turbidity sensor
Optoelectronical measuring system CUC 101 (Endress + Hauser)
Sensor in stop-positionSensor in stop-position
Endress + Hauser 2004
Backup slide 2
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Backup slide 2
Measurement arrangementMeasurement arrangement
Measuring No. 1 2 3 4 5 6 7 8 9
Phase V V V V A A A A A
Time after phase start 8 min 19 min 30 min 40 min 12 min 23 min 34 min 44 min 55 min
Defined measuring intervals of the test series
Measuring platforms with the 10 measurement points
Backup slide 3
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ac up s de 3
Dimensioning of the Biocos reactorsDimensioning of the Biocos reactors
Biological reactor Biological reactor
solids suspended liquor mixed Designage sludge Designproduction SludgeloadingBOD Volume 5
SU-reactor SU-reactor
solidssuspendedliquor MixedindexvolumeSludgeL/m/h)(675rateloadingsurfacevolumeSludge
rate settlingSludge
rate settlingSludgeinflowwater Storm
areaSurface
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