Several hamlet on the territory of the municipalities of Burgdorf and Kirchberg had no link-up to the central sewer system. To improve this unsatisfactory situation, the intention was to collect the residential wastewater from the different hamlets in pump wells and then dispose of it into the public sewer systems. On the basis of the available connections, totally six smaller pumping stations and one main pumping station were needed.
In 2010, four stormwater tanks in Wädenswilon Lake Zurich were equipped with MID-controlled PNA pneumatic discharge controls. This system was chosen at that time because it could be easily retrofitted in the old tanks, requires little space and allows the throttle volume to be changed at any time. In addition, a complete throttle shaft from STEBATEC was installed in the rainwater reservoir Schlossgasse, which has an untypical geometry due to its location between the railway track and the rainwater reservoir.
City of Winterthur (CH), Wastewater storage basin Dättnau
The sewerage network of the city of Winterthur consists of over 600 km of private and public sewerage. It collects wastewater from Winterthur and 11 surrounding municipalities and directs it to the ARA Hard. During heavy rainfall, the sewerage system below the Dättnau stormwaterbasin was overloaded even though the Dättnau stormwater basin above was almost never filled.
The 1000 inhabitant community of Diessbach in the Swiss canton of Berne obtains its drinking water from ESAG in Lyss and operates its own reservoir for the water supply. Because the previous components were obsolete and there were no spare parts left, the community had the control system renewed by STEBATEC in order to increase operational safety.
Operating cost divider according to stationarily measured external water quantities.
An association of twelve municipalities in Wallis was looking for a just cost allocation solution to account for the high foreign water content in the waste water entering the treatment plant. The measuring system installed now records the different outflows and thereby rewards those municipalities that already have installed a separation system.
Computer, control and process control technology as a carefree package.
Viteos SA is a major water and power supplier inthe canton of Neuchâtel, who also operates ownhydropower plants. The short course of the Serrière River in Neuchâtel, which receives waterfrom an extensive karstic catchment area, hasbeen generating electricity since 1939. The plantwas modernized in 1978 and rebuilt completelyin 2016. Part of the project was the moderniza-tion and simplification of the old screen systemwhich Viteos SA requested STEBATEC to do.The order also included level measurements forcontrolling the screen cleaning machine and monitoring the plant, an alarm system and aweb-based control of the main gate in the turbine inflow.
The La Verna wastewater treatment plant in Ecublens FR has already completed several moderniza-tion phases during its almost 30-year collaboration with Stebatec.After this long period of trustful cooperation, the next major project is pending; the expansionof the sewage treatment plant from 22,500 population equivalents (PE) to 50,000 PE. To replace a control system in the ongoing clarification operation requires meticulous planning, ex-tensive preparatory measures and, ultimately, great commitment during the effective conversion phase.
For 15 years, VKA and STEBATEC, the German Association for Sewerage and Wastewater Treatment, have been working together successfully. The latest milestone is the introduction of ARAbella ONLINE: With the web-based process control system, processes can be controlled online via remote access. A management of the waste water quantities becomes possible.
The Region Oberes Simmental sewage treatment plant treats sewage of the municipalities of Lenkand Zweisimmen. The largest inflow passes through the Galgenbühl storm overflow basin, other inflows originate in the area of Mannried and the Grubenwald pumping station. During rainy spells the inflow from Mannried often causes overload conditions in the sewage treatment plant.
The Zermatt sewage treatment plant, which was built underground in rock caverns, was completely rehabilitated, almost doubling its biological treatment capacity. From the mandate of electrical planning and execution, a close cooperation developed, which today covers the entire measurement and control technology.
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