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 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.

A new wastewater treatment plant will be constructed in the town of Molodezhnoe.

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.