The WWTP is currently equipped with eight mechanical screens, two grit chambers with a volume of 590mВі each, two pre-aeration channels with a capacity of 260mВі each, 13 primary sedimentation tanks with a combined volume of 30,000mВі, nine pumping stations to lift the primary-sedimentation to the biological stage, seven aeration tanks with a combined volume of 204,000mВі and 19,000 aerators, five aerator compressors, and 14 secondary sedimentation tanks with a combined volume of 58,000mВі.

The biogas produced from the plant is used as fuel in the plantвЂ™s heat production system for the production of electricity and for producing biomethane for fuelling vehicles, while the produced sludge is used as a soil conditioner. The plant treats wastewater using mechanical, chemical, biological and sand filtration processes following which the treated water is emptied into the Baltic Sea. It facilitated the development of 3,000 new homes around Henriksdalsberget. The project involved the blasting and excavation of 80,000mВі of rock, enabling the odour producing facilities to be reconstructed and placed underground. 'The WWTP will be the worldвЂ™s biggest facility implementing the membrane bioreactor (MBR) technology when the project is realised in 2018.'Д®xecuted from April 1992 to April 1997, a major expansion enabled the plant to reduce nitrogen emissions by approximately 50% and improve phosphorus treatment.ДЄnother major reconstruction project was carried out from 2007 to 2011, which involved the construction of a new hall for rough purification and new receiving station for grease and organic waste. Chemical and biological treatment facilities were later incorporated into the plantвЂ™s system. Henriksdal WWTP was opened in 1941 with an initial treatment capacity of 150,000mВі a day, which increased to 300,000mВі a day in 1953. Henriksdal WWTP history and former expansions Construction works on the SKr5.94bn ($689.5m) are scheduled to start in 2016. Integrating GEвЂ™s proprietary LEAPmbr technology, the WWTP will be the worldвЂ™s biggest facility implementing the membrane bioreactor (MBR) technology when the project is realised in 2018. The project will enable the city to meet the effluent requirements set under the Baltic Sea Action Plan (BSAP) and EU water directive. Stockholm Vatten has proposed a major expansion and renovation for the WWTP in order to meet the cityвЂ™s growing population and enable the city to close down the Bromma WWTP, which is causing an obstruction to create more homes in western Stockholm. The sludge produced from the plant is treated at the neighbouring facility in Sickla.

Operated by Stockholm Vatten (the Stockholm Water Company), the facility is one of the worldвЂ™s biggest underground WWTP and covers a total area of 300,000mВі with 18km of associated tunnels and a wastewater treatment capacity of roughly 250,000mВі a day. It currently serves approximately one million people in Stockholm and Huddinge, including Haninge, Nacka and TyresГ¶ municipalities. Henriksdal wastewater treatment plant (WWTP) is located on the boundary between Stockholm and Nacka, approximately 2km from Slussen, Sweden. The fire gates at the Henriksdal WWTP were installed by Mercor in 2010. The new rough purification facilities at Henriksdal WWTP. Henriksdal WWTP currently has a wastewater treatment capacity of 250,000m3 per day. Image courtesy of Micke SandstrГ¶m.ДЄpproximately 90% of the facilities at the site are located underground.

Henriksdal WWTP is one of the worldвЂ™s largest underground wastewater treatment plants. Stockholm Vatten's Henriksdal WWTP serves approximately one million people in Stockholm and Huddinge.

Wwtp design work