Innovations in Saint Petersburg's 12 km siphon sewer, Russia

摘要

A major new trunk sewer was finally completed in Saint Petersburg, Russia in 2014 after 28 years in the making. It now carries nearly all the city's sewage for treatment by way of a 12 km long siphon rather than allowing it to discharge to the Neva River. The sewer's unprecedented design features a number of innovative solutions. A distinctive feature is the unique arrangement of composite construction shaft connections in the pressurised section of the sewer. This paper describes the solutions adopted for removing and treating entrained air, collecting debris and preventing corrosion in the inner structures and tunnels. Alternative solutions for more efficient sewage discharge and treatment are also described. The solutions are applicable to the design and construction of other large-scale urban sewer systems.