Rublevskaya presentation

Slide 1:Северная станция аэрацииBaltic Sea:“common home – common concern”Slide 2:The 21st Baltic Sea Parliamentary ConferenceWastewater disposal system in St. PetersburgNumber of wastewater treatment plants – 14The biggest are:Central WWTP – 1.5 Mio. m3/dayNorthern WWTP – 1.25 Mio. m3/daySouth-West WWTP – 0.33 Mio. m3/dayCitizens provided with wastewater services: 97.3 %Volume of treated effluent subject disinfection: 19.7 %Volume of wastewater treated – 2.24 Mio. m3/dayLength of sewerage networks – 8,270 kmLength of tunnel collectors – 232.2 kmNumber of sludge incineration plants – 3Northern WWTPCentral WWTPSouth-West WWTPKronstadt WWTPSestroretsk WWTPRepino WWTPZelenogorsk WWTPMolodezhnyWWTPPetrodvorets WWTPMetallostroy WWTPPontonnyWWTPPushkin WWTPKolpino WWTPThere was no wastewater treatment in the city before 1978. All wastewater was discharged untreated into the water bodies.Slide 3:The 21st Baltic Sea Parliamentary ConferenceDevelopment of wastewater disposal system in St. Petersburg – Main tasksReduce adverse impact on the environmentProvide reliable wastewater servicesImprove energy efficiency and save energyProvide access to wastewater servicesSlide 5:“Hot Spots” of the Baltic SeaThe 21st Baltic Sea Parliamentary Conferenceby 2013HELCOM countriesRussiaSt.PetersburgVodokanal of St.PetersburgVodokanal of St.PetersburgVodokanal of St.PetersburgSlide 6:Clean Baltic Sea – Our Common HomeThe 21st Baltic Sea Parliamentary ConferenceSolving 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.Slide 7:Growth of wastewater treatment volumesThe 21st Baltic Sea Parliamentary ConferenceCWWTPNWWTPSWWWTPMTS - main tunnel sewerConstructionof the MTS.Phase 1Closure of untreated wastewater discharges along the Okhta River and in Petrogradsky district. Commissioning of Molodezhny WWTPConstructionof the MTS.Phase 2beforeGrowth of Wastewater Treatment Volumes96%Slide 8:The 21st Baltic Sea Parliamentary ConferenceThe Northern LandfillGeotube methodAs a result of the treatment, the sludge is:Treatment of stockpiled wastewater sludge at the Northern landfillThe main stages of sludge treatmentNorthernVolkhonka-2Treatment of the sludge stockpiled at the landfillsdewateredStabilizedDeodorizedHeavy metalsare boundSlide 9:The 21st Baltic Sea Parliamentary ConferenceSoilsOne 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 soilsSlide 10:СН4СО2Ways to reduce greenhouse gas emissions from WWTPsDevelopment and implementation of energy saving technologiesDevelopment and implementation of technologies based on the use of secondary energy sourcesGreenhouse potentialN2OSlide 11:Compliance with HELCOM Recommendation28Е/5 “Wastewater Treatment”BOD5 ≤ 15mg/lorReduction ≥ 80%Nitrogentotal ≤ 10 mg/lorReduction ≥ 70%Phosphorustotal ≤ 0,5mg/lorReduction ≥ 90%St.Petersburg(results of the first half of 2012)BOD5 = 3,2 mg/lReduction = 97,9%Nitrogentotal = 9,1 mg/lReduction = 70,4 %Phosphorustot = 0,32 mg/lReduction = 93,8 %HELCOM Recommendation 28Е/5“Wastewater Treatment”The 21st Baltic Sea Parliamentary ConferenceSlide 12:Untreated Wastewater Discharges ClosureThe 21st Baltic Sea Parliamentary ConferenceOn October 29, 2011, wastewater from 7 wastewater treatment plants in the amount of 3,000 m3/day was connected to the Northern WWTP1 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 EmbankmentMolodezhny WWTPCapacity – 2,500 m3/dayCommissioning -2015Construction of new WWTPsConstruction of Northern Tunnel CollectorConnection of small WWTPsto Northern WWTPSlide 13:Reduction of nutrients load on the water bodiesModernization of biological treatment facilities:«KREAL»«UCT», «JHB»Implementation of the chemical phosphorus removal method at all WWTPs of the cityThe 21st Baltic Sea Parliamentary ConferenceSince 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 growthSlide 14: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 algaeSlide 15:Commissioning | 2004Sestroretsk WWTP | 2005SWTP | 2006Repino WWTP | 2011Petrodvorets WWTPCapacity, m3/day | 17,000 | 330,000 | 10,000 | 65,000Slide 16:UV disinfection methodSearch for an alternative methodPurposes of searching for alternative disinfection methods:Reduction of effluent disinfection cost;Maintaining stable disinfection quality.Epidemiological safety of waterTesting of technologiesTechnology | Principle of technology | Status of tests | Confirmation of disinfection efficiencyCavitation hydrodynamic reactor | Hydrodynamic drag(cavitation effect) | Completed | NoPACS 12 | Chemical treatment | Finishing stage | YesLasur М-250 | UV + ultrasound | Preparation stage | No data availablePeakwave treatment unit | Radiation exposure | Suspended | Preliminary confirmationChlorine dioxide | Chemical treatment | Preparation stage | No data availablePACS 12CAVITATION GENERATORSlide 17:The 21st Baltic Sea Parliamentary ConferenceTertiary wastewater treatmentLamellas(St.Petersburg State TransportUniversity, Russia)Thin-layer sedimentationMicrofiltrationBrush-anthracitic filter(ZAO “Company “ECOS”, Russia)FiltrationDrum mesh filter(Hydrotech, Sweden)The objectives of the tertiary system implementation:Provision of the stable suspended solids content in discharged treated effluents to meet the standards specifiedProvision of the reduction of pollutants in the undissolved state in discharged treated effluentsProvision of the increase in efficiency of discharged effluents disinfection systems.Slide 18:1,05 MWh2,5 MWh1,1 MWhDewatered 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/yTotal energy generation is 10,5 mio kWh/ySlide 19:КОСNorthern LandfillVolkhonka–2Problems arising from landfills operation: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 populationCovering with geosynthetic materialProblem solution:Treatment with stabilizing substancesTreatment and storing in geotubesTotal area – 83.7 haOperated since 1987Design capacity – 2.0 mio m3Amount of stored sludge – 1.99 mio m3Total area – 35 haOperated since 1990Design capacity – 3.0 mio m3Amount of stored sludge – 2.9 mio m3Slide 20:Thank you for your attention!