Swedish water company Stockholm Vatten is to install membrane bioreactor (MBR) equipment from GE at its Henriksdal municipal wastewater treatment plant, making it the largest MBR installation in the world.

GE said that its LEAPmbr technology will help Stockholm Vatten expand the capacity of the facility and produce higher quality effluent to meet Sweden’s environmental commitments under the Baltic Sea Action Plan (BSAP) and the European Union Water Directive.

The Henriksdal facility treats two-thirds of Stockholm’s municipal wastewater. Located in the center of Stockholm, it incorporates over 18 kilometers of tunnels blasted into rock and that presents a challenge when it comes to expanding its capacity in the same relative footprint.

LEAPmbr is based on GE’s ZeeWeed 500 membrane, an advanced ultrafiltration technology that separates solids, bacteria and viruses from water or wastewater. When the upgrade is completed, the plant will process up to 864 million liters of wastewater per day.

“Considering the more stringent effluent requirements for nitrogen and phosphorus removal under the BSAP and E.U. Water Directive, GE’s LEAPmbr technology is the right solution for the Henriksdal retrofit project,” commented Yuvbir Singh, general manager of engineered systems — water and process technologies for GE Power & Water. “Looking ahead to future demands on the facility and region, GE’s LEAPmbr technology will give the City of Stockholm the flexibility needed to meet these challenges.”

The contract encompasses the design, supply and servicing of the entire membrane filtration package, with the work completed in several stages and delivered over a period of four to five years. No financial details were disclosed.