Северная станция аэрации Baltic Sea: “common home – common concern” The 21 st Baltic Sea Parliamentary Conference

Wastewater disposal system in St. Petersburg Number of wastewater treatment plants – 14 The biggest are: Central WWTP – 1.5 Mio. m 3 /day Central WWTP – 1.5 Mio. m 3 /day Northern WWTP – 1.25 Mio. m 3 /day Northern WWTP – 1.25 Mio. m 3 /day South-West WWTP – 0.33 Mio. m 3 /day South-West WWTP – 0.33 Mio. m 3 /day Citizens provided with wastewater services : 97.3 % Volume of treated effluent subject disinfection : 19.7 % Volume of wastewater treated – 2.24 Mio. m 3 /day Length of sewerage networks – 8,270 km Length of tunnel collectors – km Number of sludge incineration plants – 3 Northern WWTP Central WWTP South-West WWTP Kronstadt WWTP Sestroretsk WWTP Repino WWTP Zelenogorsk WWTP Molodezhny WWTP WWTP Petrodvorets WWTP Metallostroy WWTP Pontonny WWTP WWTP Pushkin WWTP Kolpino WWTP There was no wastewater treatment in the city before All wastewater was discharged untreated into the water bodies. The 21 st 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 21 st Baltic Sea Parliamentary Conference

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

132 spots 18 spots 1 “hot spot” with 19 “hot sub-spots” 13 “hot sub-spot” have been eliminated 4 “hot sub-spots” are expected to be eliminated 4 “hot spots” 6 spots HELCOM countries Russia St.Petersburg Vodokanal of St.Petersburg

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 96%

The 21st Baltic Sea Parliamentary Conference The Northern Landfill Geotube method ОбезвоживаетсяСтабилизируетсяДеодорируется Происходит 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 dewateredStabilizedDeodorized Heavy metals are bound

The 21st Baltic Sea Parliamentary Conference Soils One two-level road interchange requires stabilization by soil on the first technical grade road ( Total volume is 15,000 m 3 ). Soils application: Mobile process unit to prepare soils

СН 4 СО 2 Ways to reduce greenhouse gas emissions from WWTPs Development and implementation of energy saving technologies Development and implementation of energy saving technologies Development and implementation of technologies based on the use of secondary energy sources Development and implementation of technologies based on the use of secondary energy sources Greenhouse potential N2ON2O N2ON2O The 21 st Baltic Sea Parliamentary Conference

BOD 5 ≤ 15mg/l or Reduction ≥ 80% BOD 5 ≤ 15mg/l or Reduction ≥ 80% Nitrogen total ≤ 10 mg/l or Reduction ≥ 70% Nitrogen total ≤ 10 mg/l or Reduction ≥ 70% Phosphorus total ≤ 0,5mg/l or Reduction ≥ 90% Phosphorus total ≤ 0,5mg/l or Reduction ≥ 90% St.Petersburg (results of the first half of 2012) BOD 5 = 3,2 mg/l Reduction = 97,9% BOD 5 = 3,2 mg/l Reduction = 97,9% Nitrogen total = 9,1 mg/l Reduction = 70,4 % Nitrogen total = 9,1 mg/l Reduction = 70,4 % Phosphorus tot = 0,32 mg/l Reduction = 93,8 % Phosphorus tot = 0,32 mg/l Reduction = 93,8 % HELCOM Recommendation 28Е/5 “Wastewater Treatment” The 21 st 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 – : 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 Construction of new WWTPs Construction of Northern Tunnel Collector The 21 st Baltic Sea Parliamentary Conference Connection of small WWTPs to Northern WWTP

Modernization of biological treatment facilities: «» «KREAL» «UCT», «JHB» Implementation of the chemical phosphorus removal method at all WWTPs of the city The 21 st 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 21 st 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 The 21 st Baltic Sea Parliamentary Conference Commissioning2004 Sestroretsk WWTP 2005 SWTP 2006 Repino WWTP 2011 Petrodvorets WWTP Capacity, m3/day 17,000330,00010,00065,000

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 TechnologyPrinciple of technologyStatus of tests Confirmation of disinfection efficiency Cavitation hydrodynamic reactor Hydrodynamic drag (cavitation effect) CompletedNo PACS 12 PACS 12 Chemical treatment Finishing stage Yes Lasur М-250UV + ultrasoundPreparation stageNo data available Peakwave treatment unitRadiation exposureSuspendedPreliminary confirmation Chlorine dioxideChemical treatmentPreparation stageNo data available The 21 st Baltic Sea Parliamentary Conference PACS 12 CAVITATION GENERATOR

The 21st Baltic Sea Parliamentary Conference Tertiary wastewater treatment Lamellas (St.Petersburg State Transport University, Russia) Thin-layer sedimentation Microfiltration Brush-anthracitic filter (ZAO “Company “ECOS”, Russia) (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 effluents 3. Provision of the increase in efficiency of discharged effluents disinfection systems.

SIP at CWWTP – t DS/day. SIP at NWWTP – t DS/day. 88t DS/day SIP at SWTP – ,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 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 m 3 Amount of stored sludge – 1.99 mio m 3 Total area – 35 ha Operated since 1990 Design capacity – 3.0 mio m 3 Amount of stored sludge – 2.9 mio m 3 The 21 st Baltic Sea Parliamentary Conference

Thank you for your attention!