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Sewerage System of St. Petersburg

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Saint-Petersburg has a combined scheme of sewerage: 70 % of the whole territory has a combined sewage system, which receives domestic, industrial as well as surface (rainfall, snowmelt) runoffs, and 30 % – mainly, new districts and suburbs sewered according to the separate scheme (rainfall and snowmelt waters are collected separately from other sewage).

The structure of wastewater disposal sectors is similar to that of water supply sectors. The Saint-Petersburg wastewater disposal system comprises: sewage networks – 7936.4 km, tunnel collectors – 221.15 km, sewage pumping stations (SPS) – 109, wastewater treatment plants of different capacity – 21, sludge incineration
plants – 3.

Pipe diameters of municipal sewerage network in St. Petersburg are from 150 mm (courtyard networks) to 4,7 m (tunnel collectors). Tunnel collectors are the basic mains for transporting sewage to wastewater treatment plants. The design capacity of sewage pumping stations varies from 300 m3/d to 1,000,000 m3/d. SUE “Vodokanal of St. Petersburg” performs modernization and reconstruction of SPS by implementing modern pump units and integrated sewage pumping stations. In addition to the replacement of pumps and electrical equipment other auxiliary mechanisms are also modernized.

St. Petersburg is the first megalopolis in the world where the problem of wastewater sludge (осадок сточных вод) utilization is solved. Sludge is incinerated (сжигать) in the fluidized-bed furnaces (печь с псевдоожиженным слоем) at the temperature of 870°C. The heat produced by sludge incineration is used for process needs, space heating and power generation for Vodokanal to save energy resources. Flue gases are treated in three stages.

As for wastewater treatment technologies, until recently, a classic, two-stage (mechanical and biological) treatment process was used at the wastewater treatment plants in St. Petersburg. Since 2008 one more level of wastewater treatment has been used. It is UV disinfection of treated effluents (сточные воды).

Sludge Incineration Plant at the Northern WWT


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