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

The 21st Baltic Sea Parliamentary Conference

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

The 21st Baltic Sea Parliamentary Conference

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

The 21st Baltic Sea Parliamentary Conference

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!