Two Steffturbines operate in parallel at the Buholz waste water treatment plant in Emmen. The plant is part of REAL (Recycling Entsorgung Abwasser Luzern – a waste handling collective that was established in 2010) and treats effluents from eight municipalities in the Lucerne region. The Steffturbines recover energy from the treated waste water in the final few metres before it is returned to the watercourse.
In the ‘La Saunerie’ water treatment plant at Colombier, in the Canton of Neuchâtel, Switzerland’s first Steffturbine is producing clean electrical power. The turbine has been integrated into the treatment plant’s water circulation system, and uses the cleaned waste water before it is returned to Lake Neuchâtel. 12 kW of electricity are generated with a head of 4 metres and a flow rate of 400 litres per second. Annual production helps cover the plant’s own requirements. At an average flow rate of only 180 litres per second, it reaches around 45,000 kWh. The Steffturbine was brought into position in September 2014, and was ready to start operating after an installation period of just a few days.
Since January 2014, a Steffturbine has been supplying a school and adjacent houses with electrical power in Nyangao, Tanzania. The turbine makes use of the hydropower at the outlet of a village pond that provides water for the community. Nyangao is situated in a remote rural region on the border with Mozambique. Previously, the power was supplied by the very unstable state electricity grid, diesel generators, and a Christian mission’s existing micro hydroelectric power plant.
The exeptional features of the project:
Between 5 and 12 kW output, depending on flow rate
Assembly of the Steffturbine at WRH Walter Reist Holding AG’s headquarters in Hinwil, Switzerland, and delivery to remote Region
Installation within one week, using the simplest resources
Sensible utilization of existing structures
One hundred percent replacement of diesel generator, ecological and economical benefits
As part of a pilot project, in October 2011, WRH Walter Reist Holding AG installed the first Steffturbine at Pilgersteg in Rüti (Switzerland) at the outlet of an existing, small hydroelectric power station. With a head of 1.3 metres, the energy extracted was rather low. Nevertheless, the operation, which ran for more than 12 months, provided valuable development data. The result is characterized by four key points:
Only a three-hour installation time between delivery and commissioning
Sound mechanical condition after one year’s operation
Low maintenance requirement
Perfect operation, even during periods of hard frost at minus 20°C