The 21 st Baltic Sea Parliamentary Conference

Report
The 21st Baltic Sea Parliamentary Conference
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
Citizens provided with wastewater services: 97.3 %
Zelenogorsk WWTP
Molodezhny
WWTP
Volume of wastewater treated – 2.24 Mio. m3/day
Repino WWTP
Number of wastewater treatment plants – 14
Sestroretsk WWTP
Kronstadt WWTP
Northern WWTP
The biggest are:
•Central WWTP – 1.5 Mio. m3/day
•Northern WWTP – 1.25 Mio. m3/day
•South-West WWTP – 0.33 Mio. m3/day
Volume of treated effluent subject disinfection:
Petrodvorets WWTP
19.7 %
Central WWTP
Length of sewerage networks – 8,270 km
Metallostroy WWTP
South-West WWTP
There was no wastewater treatment
in the city before 1978. All
wastewater was discharged
untreated into the water bodies.
Length of tunnel collectors – 232.2 km
Pontonny
WWTP
Kolpino WWTP
Pushkin WWTP
Number of sludge incineration plants – 3
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
132 spots
HELCOM
countries
18 spots
Vodokanal of
St.Petersburg
Russia
6 spots
St.Petersburg
Vodokanal of
St.Petersburg
Vodokanal of
St.Petersburg
13 “hot sub-spot”
have been eliminated
1 “hot spot”
with 19 “hot sub-spots”
4 “hot spots”
4 “hot sub-spots”
are expected to be eliminated
The 21st Baltic Sea Parliamentary Conference
Clean Baltic Sea – Our Common Home
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.
The 21st Baltic Sea Parliamentary Conference
Growth of Wastewater Treatment Volumes
96%
Construction
of the MTS.
Phase 2
SWWWTP
Closure of
untreated
wastewater
discharges along
the Okhta River
and in
Petrogradsky
district.
Commissioning
of Molodezhny
WWTP
Construction
of the MTS.
Phase 1
NWWTP
CWWTP
before
MTS - main tunnel sewer
The 21st Baltic Sea Parliamentary Conference
The Northern Landfill
The main stages of sludge treatment
Geotube method
Treatment of the sludge stockpiled at the landfills
Treatment of stockpiled wastewater sludge at the Northern
landfill
Northern
Volkhonka-2
As a result of the treatment, the sludge is:
dewatered
Обезвоживается
Stabilized
Стабилизируется
Deodorized
Деодорируется
Происходит
Heavy
metals
связывание тяжелых
areметаллов
bound
The 21st Baltic Sea Parliamentary Conference
Soils
Soils application:
Mobile process unit to prepare soils
One two-level road interchange requires
stabilization by soil on the first technical
grade road ( Total volume is 15,000 m3).
The 21st Baltic Sea Parliamentary Conference
Greenhouse gas emission. Carbon footprint
Greenhouse potential
СО2
N2O
СН4
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
The 21st Baltic Sea Parliamentary Conference
Compliance with HELCOM Recommendation
28Е/5 “Wastewater Treatment”
HELCOM Recommendation 28Е/5
“Wastewater Treatment”
St.Petersburg
(results of the first half of 2012)
BOD5 ≤ 15mg/l
or
BOD5 = 3,2 mg/l
Reduction ≥ 80%
Reduction = 97,9%
Nitrogentotal ≤ 10 mg/l
or
Reduction ≥ 70%
Phosphorustotal ≤ 0,5mg/l
or
Reduction ≥ 90%
Nitrogentotal = 9,1 mg/l
Reduction = 70,4 %
Phosphorustot = 0,32 mg/l
Reduction = 93,8 %
The 21st Baltic Sea Parliamentary Conference
The 21st Baltic Sea Parliamentary Conference
Untreated Wastewater Discharges Closure
Connection of small WWTPs
to Northern WWTP
Construction of
Northern Tunnel
Collector
Construction of new WWTPs
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 WWTP
Capacity – 2,500 m3/day
Commissioning -2015
The 21st Baltic Sea Parliamentary Conference
Reduction of nutrients load on the water bodies
Modernization of biological treatment facilities:
•
Implementation of the chemical phosphorus removal
method at all WWTPs of the city
Meeting the nutrients removal norms in accordance
with HELCOM requirements;
Optimization of the system operation.
•
«KREAL»
«UCT», «JHB»
Nutrients load removal growth
Since 2011, the phosphorus
concentration in the total wastewater
discharge does not exceed 0.5 mg/l.
The 21st Baltic Sea Parliamentary Conference
The Baltic Sea water area as of August 2011
The Gulf of Finland is free
from blue-green algae
The photo was taken by NASA on order of Swedish
Meteorological and Hydrological Institute.
It was presented at WWF seminar (Stockholm).
The 21st Baltic Sea Parliamentary Conference
St.Petersburg wastewater disinfection
UV unit at SWTP
Implementation of wastewater disinfection systems
Внедрение
Commissioning
2004систем обеззараживания
2005
2006
Capacity,
m3/day
сточных
вод
2011
Sestroretsk
WWTP
SWTP
Repino WWTP
Petrodvorets
WWTP
17,000
330,000
10,000
65,000
Disinfection systems implementation plan
for Vodokanal’s WWTPs
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.
The 21st Baltic Sea Parliamentary Conference
Search for a disinfection method alternative to UV
UV disinfection method
Epidemiological safety of water
Search for an alternative method
PACS 12
CAVITATION GENERATOR
Purposes of searching for
alternative disinfection methods:
Testing of technologies
Technology
Principle of technology
Status of tests
Confirmation 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
•
•
Reduction of effluent disinfection cost;
Maintaining stable disinfection quality.
The 21st Baltic Sea Parliamentary Conference
Tertiary wastewater treatment
Thin-layer sedimentation
Lamellas
(St.Petersburg State Transport
University, Russia)
Microfiltration
Drum mesh filter
(Hydrotech, Sweden)
Filtration
Brush-anthracitic filter
(ZAO “Company “ECOS”, Russia)
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 effluents
3. Provision of the increase in efficiency of discharged effluents
disinfection systems.
The 21st Baltic Sea Parliamentary Conference
Sludge Incineration Plants
• Dewatered sludge utilization 100%;
• Sludge incineration to ash, the volume is 10 times
reduced;
SIP at CWWTP – 1997
250 t DS/day.
1,05 MWh
• 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.
SIP at NWWTP – 2007
186t DS/day.
2,5 MWh
SIP at SWTP – 2007
88t DS/day
• 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
1,1 MWh
The 21st Baltic Sea Parliamentary Conference
Sludge landfills
Northern
Landfill
Volkhonka–2
•
•
•
•
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
Problem solution:
1. Covering with geosynthetic material
2. Treatment with stabilizing substances
КОС
Problems arising from landfills operation:
1.
2.
3.
4.
Landfill is a potential source of air and ground water pollution
(environmental problem);
Landfill facilities (sludge beds and lagoons) are filled up to critical
levels;
Inefficient use of land plots;
Odor complains from the population
3. Treatment and storing in geotubes
Thank you for your attention!

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