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TRANSCRIPT
10/23/2012
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WASTEWATER TREATMENT
IN WARSAW
Gdańsk 16-17 October 2012
Karolina Skalska-Józefowicz
Infrastructure Department,
Warsaw City Hall
Water supply & sewage system in Warsaw
Length of water supply system – 3167 km
Length of sewage system –2832 km
Price of water – 4.54 zl/m³ (1.1 €/m ³)
Price of sewage – 6,93 zl/m ³ (1.7 €/m ³)
Treated sewage in WWTPs – 100%(since end of June 2012)
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Waterworks Units and WWTPs in Warsaw
Wieliszew
„Północny” Waterworks Plant
„Praski” Waterworks Plant
„Centralny” Waterworks Plant
„Pruszków” Wastewater
Treatment Plant
„Południe” Wastewater Treatment Plant
„Czajka” Wastewater
Treatment Plant
Czajka Wastewater Treatment Plant
Main information:
Designed in early 1970s
Under operation since 1991
Situated in north-eastern Warsaw Bialoleka District (area of 52.7 ha)
The biggest sewage treatment plant in Poland
JULY 2008
10/23/2012
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WWTP “Czajka” contractors
• WARBUD S.A., Warsaw
• WTE WASSERTECHNIK GMBH, ESSEN, Germany
• KRÜGER A/S, SØBORG,Denmark
• VEOLIA WATER SYSTEMS SP. Z O.O., Krakow
• OTV SA, SAINT MARICE, France
SEPTEMBER 2009
Modernization and extension of the
WWTP “Czajka”
Main goals of modernization and extension of the Czajka WWTP:
Comply with applicable sewage treatment regulations,
Increase the capacity from 240 000 m3/day up to 435 300 m3/day,
Collection of sewage from the central and northern parts of Warsaw’s left bank
Enabling to collect total maximum wastewater flow including rain water.
Solve the sludge problems – incineration plant
JULY 2012
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PID of the mechanical part
of WWTP “Czajka”
COLLECTIVE INLET CHAMBER
SAND SAND and FAT REMOVAL
TANKS
PIRIMARY SETTING TANKS
INTERMEDIATE PUMPING STATION
BIOLOGICAL TREATMENT
BY-PASS
FAT
SCREENS SCREENS
PRIMARY SLUDGE
FAT
WASTEWATER FROM THICKINING AND DEWATERING
INLET PUMPING STATION (for wastewater from left side of
the Vistula River)
Inlet pumping station for left side
of the Vistula River
• Gravitational collector DN 2800,
• 4 pcs. screens - dimension 50mm
• 10 pcs. sink pumps with frequency converter
• 2 pcs. force pipes DN2000 to collective chamber
Connection to air deodorization system
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Screens structure
• 9 pcs. screens - dimension 6mm
• 2 pcs. transporting lines for screens
• 2 pcs. risings screens
• 2 pcs. presses for screens
• Disinfection screens installation
• Hermetic containers for screens
Connection to air deodorization system
Sand removal tanks and primary setting
tanks • 4 pcs. two aeration chambers sand and fat removal tanks (8 lines), length - 50m,
depth - 3,9m
• Pumping scrapers
• Sand separator
• 6 pcs round primary setting tanks - diameter - 50m, depth - 3,3m
• Primary sludge pumping station
• Float removing system (scrapers + chamber)
• By-pass pipes system
• Covered and connected to air deodorization system
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Intermediate pumping station
• 2 pcs inlet channels (each from 3 primary setting tanks) and by-pass channel (after sand removal tanks)
• wastewater inlet from sludge part
• 9 pcs pumps with frequency converters
• regulated overflows – distribution wastewater for bioreactors.
Biological treatment
Bioreactor
85% 15%
PRELIMINARY
DENITYFICATION
SELEKTOR
HYDROLISYS TANK 90%÷20%
10%÷80%
NITRYFICATION/
DENITYFICATION CHAMBER
WASTEWATER
SEDIMENTATION TANK
RECYRCULATED SLUDGE
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Biological treatment
• 10 pcs technological lines with BIODENIPHO® bioreactors
• Each biological line includes
- BIO-P –phosphorus removal
– BIODENITRO – nitrogen removal
– aeration tank
– 2 pcs secondary setting tanks
– recirculation system (STAR programme – recirculation, aeration, chemical dosing, phases cycle control)
Bioreactor equipment
• 4800 pcs membrane discs in aeration chamber
(for one bioreactor)
• 17 pcs of mixers
• Regulated overflows
• On-line meters: nitrates (NO3), ammonia,
phosphates, oxygen concentration, REDOX,
• Chemicals dosing system (ferrum salt,
aluminium salt, methanol, HCOOH for cleaning
membranes )
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Secondary setting tanks
• 20 pcs secondary setting tanks - diameter 48 m, depth 4,6 m
• Suck scrapers
• Float removing system
Recirculation pumping stations
• 5 pcs recirculation pumping stations
• Each pumping station include
- two recirculation lines (8 pcs basic pumps + 2 pcs
reserve pumps)
- two excessive sludge lines (2 pcs basic pumps + 2 pcs
reserve pumps)
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Sludge line Excessive sludge
Primary sludge
Mechanical
thickener
Gravitational
thickener
Thick sludge tank Fat
Desulphurizing Digesters
Dewatering
Incineration Plant Boilers
Heat
Power
ASHES
Primary sludge thicken line
• 6 pcs gravitational thickeners with rod mixers and overflows for over sludge waters
• Recirculation system
• Air system
• Primary sludge concentration 3%
• Thicken sludge concentration 5,5%
• Retention time 2,5 days
• Old thickeners diameter - 17,4m New thickeners diameter – 23m depth - 3m
• On-line meters (level and sludge level)
• Covered and connected to air deodorization system
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Gravitational thickeners
Excessive sludge thicken line
• Compensatory tank for excessive sludge
• 6 pcs mechanical thickeners (centrifuges)
• Polymer dosing system
• Max. load 16 100m3/d
• Excessive sludge concentration - 0,6 - 1,5 %
• Thicken sludge concentration - 6%
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Sludge methane fermentation and
biogas production
• 6 pcs old digesters - capacity 7 200 m3 and 4 pcs new digesters – capacity 10 000m3
• Mixing sludge dosing – average concentration 5,8-5,9%
• One phase mesophilic methane fermentation, temp. 33-35°C
• Propeller mixers in new digesters and pumping mixing system in old digesters
• Heat exchangers in new structures and steam injection in old structures
• Biogas intake on the top of digesters
• Anti- foam columns
• Catalytic desulfurizing - wet method BIOSULFEX - 3 lines
• 2 pcs two-coating biogas tanks – capacity 6800m3 each
• Biogas blowers
• Cogeneration and torch
Sludge methane fermentation and
biogas production
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Sludge dewatering
• 5 pcs mechanical thickeners (centrifuges) located in Sludge
Processing Structure
• Polymer dosing system
• Pumps removing dewatering sludge system
• Maximum capacity for sludge after fermentation118 Mg/d
• Sludge after fermentation concentration - 37,2-37,4 kg/m3
• Dewatering sludge concentration 25%
• Max. capacity for dewatering sludge 476 m3/d
Storage and transport dewatering
sludge • 2 pcs concrete, heating, cover tanks for dewatering sludge
• Piston pumps for sludge transport with lubricant dosing
system
• 3 position for loading trucks
• Two pipelines to Incineration Plant
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Incineriation plant on WWTP „Czajka”
Incineration plant was designed for screens, fat, dewatering sludge from „Czajka”
plant and dry sludge from „Południe” plant and energy production.
• Max. Day capacity - 671 Mg of fuel (598 Mg dewatering sludge, 20 Mg dry sludge,
31 Mg screens, 20 Mg sludge from sand removal tanks and 2 Mg fat).
• Annual capacity 137 000 do 224 000 Mg of waste
• Max. Electric power 1,6 MW
Sewage treatment in modernized WWTP
“Czajka”
Stabilized
sludge
dry sludge
dewatering
dryer
incineration
dewater
sludge
ash
commercial use of ash energy
Condensed
sludge
heat electric
power
biogas
gravitation
thickener
mechanical
thickening device
excessive actived
sludge
condensed
sludge
preliminary
sludge
screens sand, fat
treated
sewage
pumping
stadion
inlet
bar
screens sand and fat
removal
tanks
intermediate
pumping
station
bioreactors
secondary
setting tanks
pump
station
outlet
primary
setting tanks
sewage
from
sewage
system
fermentation
chambers
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Treated water from WWTP “Czjka”
Before modernization
Qaverage COD BOD SS Ntotal Ptotal
m3/d mg O2/dm
3 mg O2/dm
3 mg /dm
3 mgN/dm
3 mgP-PO4/dm
3
Jul-Sept 2007 179 589 43,5 3,4 9,6 17,10 1,11
Oct-Dec 2007 179 950 56,1 5,5 18,5 19,96 1,40
Jan-Mar 2008 192 024 48,0 10,8 18,5 19,28 0,81
Apr-Jun 2008 178 898 42,7 5,1 10,5 20,28 1,00
Polish law requirements 125,0 15,0 35,0 10,00 1,00
After modernization (commissioning time without sewage from the left side of Vistula River)
Qaverage COD BOD SS Ntotal Ptotal
m3/d
mg
O2/dm3 mg O2/dm
3 mg /dm
3 mgN/dm
3
mgP-
PO4/dm3
Jul-Sept 2011 230 110 29,0 2,7 5,8 5,65 0,27
Oct-Dec 2011 181 422 28,0 2,6 4,6 6,43 0,34
Jan-Mar 2012 178 468 28,8 3,3 7,1 9,27 0,52
Apr-Jun 2012 187 988 29,6 3,4 8,1 6,58 0,40
Polish law requirements 125,0 15,0 35,0 10,00 1,00
HELCOM requirements for WWTP with a load of more than 100 000 person equivalent
BOD - at least 80% reduction, or at most a concentration in the effluent 15 mg/dm3
P - at least 90% reduction or at most a concentration in the effluent 0,5 mg/dm3
N - a min.70-80% reduction, or at most a concentration in the effluent 10 mg/dm3
Sewage transfer system to WWTP “Czajka”
• Building of gravitational sewage pipeline diameter 2,8m and
5,817km length (red colour)
• Building of U-bend sewage system under the Vistula River –
diameter 4,4 m and 1,5km length (black colour)
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Sewage transfer system to WWTP “Czajka”
Construction of the transfer system from the left side of
Warsaw to the WWTP “Czajka”:
Total length – 8.2 km
Microtunneling method
Value of project – 140 million €
Sewage transfer system to WWTP “Czajka”
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Południe Wastewater Treatment Plant
Since 2006 the Południe Wastewater Treatment Plant has been collecting about 60 000 m³ of sewage per day – total capacity 80 000 m³.
Treated water from WWTP “Poludnie”
Q average COD BOD SS N total P total
m3/d mg O2/dm
3 mg O2/dm
3 mg /dm
3 mgN/dm
3 mgP-PO4/dm
3
Jan-Mar 2011 71 291 27,2 2,9 6,3 8,55 0,37
Apr-Jun 2011 61 461 23,8 2,2 5,1 6,47 0,38
Jul-Sept 2011 68 507 19,7 1,5 3,7 4,73 0,47
Oct-Dec 2011 58 825 22,5 1,8 5,1 6,46 0,45
Jan-Mar 2012 59 734 23,7 2,0 6,2 6,71 0,60
Apr-Jun 2012 59 553 22,5 1,9 5,2 5,83 0,60
Law requirenents 125,0 15,0 35,0 10,00 1,00
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The Vistula River and the Balitc Sea
Ecological effect of modernization and extension of the
Czajka WWTP:
• reduction of nitrogen from 4237 to 1795 tonnes annually (58%)
or more
• reduction of phosphorus from 434 to 172 tonnes annually
(60%) or more