Facts & Figures
| Client | ARA Sarneraatal | ||||||
| Licensee | WABAG | ||||||
| Location | Alpnach, Switzerland | ||||||
| Operation Start | 2017 | ||||||
| Wastewater | Municipal | ||||||
| Project Type | Greenfield | ||||||
| Process Configuration | Pre-treatment + Primary settler + Nereda | ||||||
| Nereda Design Capacity: | |||||||
| • Dry Weather Flow | 14 MLD | ||||||
| • Peak Flow | 1,872 m3/h | ||||||
| • PE | 65,000 PE (PE = 60 gBOD/d) | ||||||
About the Alpnach Nereda WWTP
Nereda technology is selected for the extension of the Alpnach Wastewater Treatment Plant in Switzerland. The innovative aerobic granular biomass technology provides an optimal and cost-effective solution to treat the wastewater as an alternative to conventional systems. The Nereda installation in Alpnach will be the first Nereda in Switzerland.
The challenge
Alpnach Wastewater Treatment Plant in Switzerland were looking for a solution to expand their current treatment plant.
The solution
Nereda technology was selected for the extension of the Alpnach Wastewater Treatment Plant in Switzerland. The innovative aerobic granular biomass technology provides an optimal and cost-effective solution to treat the wastewater as an alternative to conventional systems.
The Nereda installation in Alpnach is the first Nereda in Switzerland. The extension of the Alpnach WWTP was tendered based on conventional SBR technology but WABAG Water Technology Switzerland – who signed a 10 year Cooperation Agreement with Royal HaskoningDHV in November 2014 to deliver Nereda to Switzerland – also evaluated the possibilities and advantages of the Nereda technology.
The outcome
After start-up in 2017 Alpnach WWTP is treating a municipal and industrial effluent load of 49,000 p.e. (or 65,000 p.e. in accordance with Swiss calculations), with a daily average flow of 14,000 m3/day and a peak flow of 1,845 m3/hour. The Nereda installation is based on a configuration with 1 buffer tank and 3 Nereda reactors.
Gerhard Ryhiner, Chairman of the Managing Board WABAG Water Technology said: “The advantages of Nereda are convincing: a reduced footprint (-34%) and volume (-40%), and higher nitrogen removal in spite of the reduced volume.”
View the live webcam on the Alpnach wastewater treatment plant
Click on the image to see the live stream on the existing WWTP in the front with the Nereda being constructed in the back.
The local benefits of the project
 | Cost-effective solution | |
| Enhanced capacity | |
| Small footprint | |
| Efficient nutrient removal | |
| | Environmental benefits |