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Северная станция аэрации
Baltic Sea:“common home – common concern”
The 21st Baltic Sea Parliamentary Conference
The 21st Baltic Sea Parliamentary Conference
Wastewater disposal system in St. Petersburg
Number of wastewater treatment plants – 14The biggest are:•Central WWTP – 1.5 Mio. m3/day•Northern WWTP – 1.25 Mio. m3/day•South-West WWTP – 0.33 Mio. m3/day
Citizens provided with wastewater services: 97.3 %
Volume of treated effluent subject disinfection: 19.7 %
Volume of wastewater treated – 2.24 Mio. m3/day
Length of sewerage networks – 8,270 km
Length of tunnel collectors – 232.2 km
Number of sludge incineration plants – 3
Northern WWTP
Central WWTP
South-West WWTP
Kronstadt WWTP
Sestroretsk WWTP
Repino WWTP
Zelenogorsk WWTP
Molodezhny WWTP
Petrodvorets WWTP
Metallostroy WWTP
Pontonny WWTP
Pushkin WWTP
Kolpino WWTP
There was no wastewater treatment in the city before 1978. All wastewater was discharged
untreated into the water bodies.
The 21st Baltic Sea Parliamentary Conference
The 21st Baltic Sea Parliamentary Conference
Development of wastewater disposal system in St. Petersburg – Main tasks
Reduce adverse impact on the environment
Provide reliable wastewater services
Improve energy efficiency and save energy
Provide access to wastewater services
The 21st Baltic Sea Parliamentary Conference
Baltic Sea: “common home – common concern”
Helsinki Commission (HELCOM) is an initiator of the environmental policy for the Baltic Sea Region to be implemented by developing of:
• common environmental targets;• activities to meet these targets
The Commission comprises Sweden, Denmark, Finland, Lithuania, Latvia, Estonia, Germany, Poland and Russia.
Our objective is to treat wastewater in accordance with HELCOM requirements: • total nitrogen amount in effluent – maximum 10 mg/l• total phosphorus amount in effluent - maximum 0,5 mg/l
The 21st Baltic Sea Parliamentary Conference
“Hot Spots” of the Baltic Sea
The 21st Baltic Sea Parliamentary Conference
1992
132 spots
18 spots
2006
1 “hot spot”with 19 “hot sub-spots”
BY 2012
13 “hot sub-spot”have been eliminated
4 “hot sub-spots” are expected to be eliminated
4 “hot spots”
6 spots
BY 2013
HELCOM countries
Russia
St.Petersburg
Vodokanal of St.Petersburg
Vodokanal of St.Petersburg
Vodokanal of St.Petersburg
Clean Baltic Sea – Our Common Home
The 21st Baltic Sea Parliamentary Conference
Solving the eutrophication problem (pollution of the marine environment with blue-green algae) is one of the major environmental tasks for the Baltic Sea countries.
Most European countries apply a well-known chemical tertiary treatment method to ensure enhanced phosphorus removal.
John Nurminen Foundation offered its assistance for implementing this technology in St.Petersburg.
Growth of wastewater treatment volumes
The 21st Baltic Sea Parliamentary Conference
CWWTP
NWWTP
SWWWTP
MTS - main tunnel sewer
Construction of the MTS.
Phase 1
Closure of untreated
wastewater discharges along the Okhta River
and in Petrogradsky
district. Commissioning of Molodezhny
WWTP
Construction of the MTS.
Phase 2
before
Growth of Wastewater Treatment Volumes 96%
The 21st Baltic Sea Parliamentary Conference
The Northern Landfill
Geotube method
Обезвоживается Стабилизируется ДеодорируетсяПроисходит
связывание тяжелых металлов
As a result of the treatment, the sludge is:
Treatment of stockpiled wastewater sludge at the Northern landfill
The main stages of sludge treatment
Northern
Volkhonka-2
Treatment of the sludge stockpiled at the landfills
dewatered Stabilized Deodorized Heavy metals
are bound
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Soils
One two-level road interchange requires stabilization by soil on the first technical grade road ( Total volume is 15,000 m3).
Soils application:
Mobile process unit to prepare soils
СН4СО2
Ways to reduce greenhouse gas emissions from WWTPs
• Development and implementation of energy saving technologies• Development and implementation of technologies based on the use of
secondary energy sources
Greenhouse potentialN2O
Greenhouse gas emission. Carbon footprint
The 21st Baltic Sea Parliamentary Conference
Compliance with HELCOM Recommendation 28Е/5 “Wastewater Treatment”
BOD5 ≤ 15mg/l
or
Reduction ≥ 80%
Nitrogentotal ≤ 10 mg/l
or
Reduction ≥ 70%
Phosphorustotal ≤ 0,5mg/l
or
Reduction ≥ 90%
St.Petersburg (results of the first half of 2012)
BOD5 = 3,2 mg/l
Reduction = 97,9%
Nitrogentotal = 9,1 mg/l
Reduction = 70,4 %
Phosphorustot = 0,32 mg/l
Reduction = 93,8 %
HELCOM Recommendation 28Е/5“Wastewater Treatment”
The 21st Baltic Sea Parliamentary Conference
Untreated Wastewater Discharges Closure
The 21st Baltic Sea Parliamentary Conference
On October 29, 2011, wastewater from 7 wastewater treatment plants in the
amount of 3,000 m3/day was connected to the Northern WWTP
1 stage – 2008 : 12 discharges (89,700 m3/day)2 stage – 2009-2010: 44 discharges (98,800 m3/day)3 stage – 2011: 5 discharges (29,700 m3/day) 2012: 5 discharges (35,500 m3/day) 2013: construction of the collector along Robespiera Embankment
Molodezhny WWTPCapacity – 2,500 m3/dayCommissioning -2015
Construction of new WWTPs
Construction of Northern Tunnel
Collector
The 21st Baltic Sea Parliamentary Conference
Connection of small WWTPs to Northern WWTP
Reduction of nutrients load on the water bodies
Modernization of biological treatment facilities:
«KR
EA
L»
«UC
T»,
«JH
B»
Implementation of the chemical phosphorus removal method at all WWTPs of the city
The 21st Baltic Sea Parliamentary Conference
Since 2011, the phosphorus concentration in the total wastewater discharge does not exceed 0.5 mg/l.
• Meeting the nutrients removal norms in accordance with HELCOM requirements;
• Optimization of the system operation.
Nutrients load removal growth
The photo was taken by NASA on order of Swedish Meteorological and Hydrological Institute.
It was presented at WWF seminar (Stockholm).
The Gulf of Finland is free from blue-green algae
The Baltic Sea water area as of August 2011
The 21st Baltic Sea Parliamentary Conference
Implementation of wastewater disinfection systems
Внедрение систем обеззараживания сточных вод
Purpose of wastewater disinfection systems implementation:
• prevention of bacterial and viral pollution of water bodies;
• ensuring epidemic safety of water bodies;
• maintaining stable conditions to meet the purposes of water use.
UV unit at SWTP
Disinfection systems implementation plan for Vodokanal’s WWTPs
St.Petersburg wastewater disinfection
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Commissioning 2004
Sestroretsk WWTP
2005
SWTP
2006
Repino WWTP
2011
Petrodvorets WWTP
Capacity, m3/day 17,000 330,000 10,000 65,000
UV disinfection method
Search for an alternative method
Purposes of searching for alternative disinfection methods:
• Reduction of effluent disinfection cost;• Maintaining stable disinfection quality.
Epidemiological safety of water
Testing of technologies
Technology Principle of technology Status of testsConfirmation of disinfection
efficiency
Cavitation hydrodynamic reactor
Hydrodynamic drag (cavitation effect)
Completed No
PACS 12 Chemical treatment Finishing stage Yes
Lasur М-250 UV + ultrasound Preparation stage No data available
Peakwave treatment unit Radiation exposure Suspended Preliminary confirmation
Chlorine dioxide Chemical treatment Preparation stage No data available
Search for a disinfection method alternative to UV
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PACS 12 CAVITATION GENERATOR
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Tertiary wastewater treatment
Lamellas (St.Petersburg State Transport
University, Russia)
Thin-layer sedimentation Microfiltration
Brush-anthracitic filter (ZAO “Company “ECOS”, Russia)
Filtration
Drum mesh filter (Hydrotech, Sweden)
The objectives of the tertiary system implementation:1. Provision of the stable suspended solids content in discharged treated effluents to meet the standards specified 2. Provision of the reduction of pollutants in the undissolved state in discharged treated effluents3. Provision of the increase in efficiency of discharged effluents disinfection systems.
SIP at CWWTP – 1997 250 t DS/day.
SIP at NWWTP – 2007 186t DS/day.
88t DS/day SIP at SWTP – 2007
1,05 MWh
2,5 MWh
1,1 MWh
• Dewatered sludge utilization 100%;
• Sludge incineration to ash, the volume is 10 times reduced;
• No pathogenic flora and unpleasant odor in the ash;
• The content of harmful components in the cleaned flue gas from sludge incineration complies with the EC / RF regulations;
• Heat abstracted from flue gases is used for hot water supply and heating;
• The generated heat is utilized. Turbogenerators provide an opportunity to produce electricity.
• Possibility of industrial application of ash.
Total energy consumption of CWWTP, NWWTP and SWTP is 370 mio kWh/y
Total energy generation is 10,5 mio kWh/y
Sludge Incineration Plants
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КОС
Northern Landfill
Volkhonka–2
Problems arising from landfills operation:1. Landfill is a potential source of air and ground water pollution
(environmental problem);2. Landfill facilities (sludge beds and lagoons) are filled up to critical
levels; 3. Inefficient use of land plots; 4. Odor complains from the population
1. Covering with geosynthetic material
Problem solution:
2. Treatment with stabilizing substances
3. Treatment and storing in geotubes
• Total area – 83.7 ha • Operated since 1987 • Design capacity – 2.0 mio m3
• Amount of stored sludge – 1.99 mio m3
• Total area – 35 ha • Operated since 1990• Design capacity – 3.0 mio m3
• Amount of stored sludge – 2.9 mio m3
Sludge landfills
The 21st Baltic Sea Parliamentary Conference
Thank you for your attention!