Automation of remote stormwater basins and pumping stations
The regional water authorities of Lake Zug in Switzerland required the automation of 30 remote stormwater basins and pumping stations and the networking of these to the central wastewater treatment plant. In 2002 Swiss engineering company Chestonag Automation AG won the contract to supply this system.
The ARA Schönau plant treats residential and industrial wastewater from an area with approximately 140 000 residents. The dry-weather treatment capacity of the plant is 800 litres per second. In wet weather the maximum treatment capacity is 1600 litres per second, with an additional 1200 litres per second which are mechanically cleaned and discharged into the nearby river.
The 30 stations around Lake Zug collect surface water and wastewater from the surrounding towns in stormwater basins and where possible the surface water from residential areas is separated and led directly into the lake. The stormwater basins have a storage capacity of 100-1000 m³ and the pumping station has a capacity of 20-200 litres per second. From the stormwater basins, the wastewater is pumped to the ARA Schönau plant. A total of 75 kilometres of pipes and tunnels connect the remote stations with the plant. The pipe and tunnel system has a storage capacity of 8000 m³, which is used as a giant stormwater basin. In heavy rains, when the basins fill up quickly, some water is discharged directly into the lake. The discharge outlet is at the top of the basin to ensure that the released water contains the lowest amount of particulate matter.
Source and more info: instrumentation