The Zweckverband der Abwasserregion Olten (ZAO) is an association of 13 municipalities which treat their wastewater in the WWTP Winznau. The WWTP itself was and is already the subject of refurbisching measures, but other structures in the sewer network also showed a considerable need for refurbischment, including pumping stations and storm water tanks.
Intelligent management of the storage volumes in the sewer network makes a major contribution to water protection, reduces overflows, makes optimum use of the storage volume in the sewer network and ensures the hydraulic capacity utilisation of the sewage treatment plant.
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