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.
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.
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 Office for Water and Waste of the Canton of Berne obliges the operators of wastewater treatment plants (WWTP) to comply with the discharge conditions for treated wastewater into water bodies even in the event of a power failure. Therefore, the operators of the WWTP must install an emergency power supply that can guarantee the operation of the essential plant components.
The City of Grenchen is currently renewing itsfour stormwater basins constructed in differentyears. The first such basin to be refurbished isthe second-oldest and the biggest of the four basins built in 1975 ad named after the publicswimming pool nearby. The basin had a numberof structural defects but most pressing were therectification of issues of operating the basin andproblems of work safety.
Electromechanical equipment for the Ipsach rainwater basin
The Association for Sewers and Waste Water (VKA) in Nidau is responsible for the waste water treatment plants from Port to Moeringen on the southern banks of Lake Bielersee. The Association manages several rainwater basins and pumping station. The Ipsach rainwater basin was built in the early 1990s. The unique feature is that this is a rainwater basin in a connected system.
The old safety control system was designed in BOSB 72 (operation without constant supervision), which required extensive checks at least every 72 hours. The new control system was designed in BOME (operation without manual intervention), which significantly reduced the amount of work required for monitoring.
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