Challenging projects

Closure of untreated wastewater discharges

As a result of the Northern Tunnel Collector project, 98.4 % of wastewater has been treated in St. Petersburg since 10 October 2013.

In December 2014, Vodokanal of St. Petersburg closed nine direct discharges of the Petrovsky Stadium which were the source of thousands cubic meters of untreated wastewater per day coming to the Neva River. This wastewater is currently transported to the Northern Wastewater Treatment Plant.

Direct wastewater discharges along Petrogradskaya Embankment were closed in the end of 2014, along Admiralteiskaya Embankment – in 2015. Today, 98.5% of wastewater undergoes treatment in St. Petersburg.

In 2016, within phased termination of the untreated wastewater discharge:

  • 15 direct wastewater discharges with a total volume of 366 m3/day were eliminated, thus ceasing discharge of untreated wastewater into the following water bodies: Bolshaya Neva, Srednyaya Nevka, Malaya Nevka, Neva Bay, Okhta, Chukhonka, Chernaya Rechka.
  • Continued construction of the Okhtinsky collector 1st stage for elimination of untreated wastewater discharge to the Okhta river basin.
  • Continued construction works on the reconstruction of storm water sewerage at the Murinsky Park territory. The project will result in switching of 7 storm water discharges to the wastewater collector and its treatment at the Northern Wastewater Treatment Plant.

In 2016, the micro-tunnel along Lunacharsky Prospekt (1,783 m long and 1200 mm in diameter) driving was performed, and shafts and chambers technical equipment is currently being performed. Works along the Severnyy Prospekt began: 136 m with diameter of 1200 mm were drilled.

  •  Design of the sewerage network for the switchover of the combined discharge in the Metallostroy settlement has been completed, the measure implementation will enable elimination of untreated wastewater discharge to the Slavyanka River.
  • Design of the sewerage networks and collectors for the untreated discharges switching is performed: two discharges in Lomonosov into the Neva Bay and the Karasta River, three discharges into the Okkerville River.

In the next few years the untreated wastewater discharges along Karpovka River Embankment will be closed. Okhta tunnel collector will be constructed to stop untreated wastewater discharge into the Okhta River.

Reconstruction of the wastewater treatment plants

Vodokanal is reconstructing the Central WWTP and the Northern WWTP in order to increase wastewater treatment efficiency and stabilize nutrients removal process.

In next years, comprehensive rehabilitation of Kolpino WWTP and Pontonny WWTP as well as modernization of Zelenogorsk WWTP will be implemented.

Construction of new wastewater treatment plant in Molodezhnoe is underway. New technology for wastewater treatment using membrane bioreactors will be applied at the plant for the first time in St.Petersburg. The project of new WWTP in Molodezhnoe comprises construction of main pumping station, treatment facilities (including mechanical and biological treatment), sludge treatment facilities, chemicals facilities and gas treatment facilities. The new WWTP capacity will be 2.500 cubic meters per day and will ensure treatment of wastewater from three villages - Molodezhnoe, Serovo and Smolyachkovo.

Recycling of wastewater sludge stored at the landfills

Before construction of the sludge incineration plants, wastewater sludge had been stored at the landfilling areas. A geotube method of wastewater sludge treatment and recycling is used by Vodokanal for landfill reclamation. Sludge is fed into the geo-tubes (containers made of polymer filter cloth) after being treated with special chemicals. The method presupposes static dewatering – filtration of sludge liquid phase through the walls of geo-tubes located on specially arranged drainage area. The result of such treatment is the production of a harmful substrate which is odor free and may be used for manufacturing fertilizers or technogenic soil.

Improvement of the sewerage system reliability

Ring tunnels and backup collectors are planned to be constructed together with the reconstruction of the existing tunnel sectors in order to improve the reliability of the tunnel sewerage system.

In particular, construction of the 2nd line of the backup collector from Vernosti Street to the Murinsky Ruchey near the Muzhestva Square, reconstruction of the tunnel sewer along Rizhsky Prospect and tunnel sewer along Shosse Revolyutsii was completed.

The following works are under implementation:

  • construction of the ring tunnel along Basseynaya Street,
  • construction of the ring tunnels along the Fontanka River Embankment,
  • construction of the ring tunnel collector along Petrogradskaya Storona.

Wastewater disposal system reliability improvement

Construction and reconstruction of networks and collectors for direct discharges switchover will continue in the upcoming years in order to reduce negative impact on the city's water bodies:

Reconstruction of storm water sewerage at the Murinsky Park territory. The project implementation will improve environmental situation in the Murinsky stream and Okhta River basins. Seven most problematic storm water discharges are switched to the wastewater disposal system for further treatment at the Northern Wastewater Treatment Plant. Works will be completed in 2017.

  • Construction of the Okhta wastewater collector.
  • Construction of wastewater transportation system from Reshetnikovo and Krasavitsa settlements to Zelenogorsk.
  • Switching of direct discharges of Petrogradskiy district, 15 discharges along the Karpovka River embankment.
  • Reconstruction of transportation system from Martyshkino pumping station to the Petrodvorets WWTP, which will enable switching to the system of currently directly discharged Lomonosov combined sewage.

Construction and reconstruction of networks and collectors  will continue  in order to improve reliability of wastewater disposal and environmental safety systems:

  •  Construction of ring collector along Baseynaya Street. The project implementation will ensure the wastewater disposal reliability of Moscovskiy and Frunzenskiy districts of St.Petersburg. There will be a technical possibility of inspection and repair of collectors along Blagodatnaya and Krasnoputilovskaya streets.
  • Construction of a pipe-bridge from the shaft 1/27 of the tunnel collector at Obukhovsky Prospekt 33 to the main collector shaft.
  • Reconstruction of tunnel collector sections on the Kryukov channel embankment and the Moyka River embankment.
  • Reconstruction of the feed collector to the Zelenogorsk WWTP.
  • Design of the construction of the Vyborgskiy tunnel collector backup 3rd stage in the Muzhestva Square area.

Design and construction of wastewater systems in settlements is carried out in order to provide access to the centralized wastewater disposal services. The construction of networks will commence in Gorelovo of Krasnoselskiy district (1st stage), Lysiy Nos of Primorskiy district, Toriki of Krasnoselskiy district, Novoselki of Pushkinskiy district of St.Petersburg. Design will be completed and construction will begin in Gorelovo of Krasnoselskiy district (2nd stage), Petro-Slavyanka, Pontonnyy and Sapernyy of Kolpinskiy district, Pavlovsk of Pushkinskiy district, Kronstadtskaya Koloniya of Petrodvortsovyy district of St. Petersburg.