The Kloten Opfikon wastewater treatment plant purifies the wastewater for the towns of Kloten and Opfikon as well as Zurich airport. The plant needs comprehensive expansion, upgrading and renovation as a result of the population increase in the drainage area as well as the new statutory requirements for eliminating micropollutants.
The project includes new mechanical pre-treatment, modification of the biological area according to the NEREDA® process, a new ozonation facility for eliminating micropollutants, two new digestion tanks and a new exhaust air biofilter. The constricted space means that the actual build is proving highly complex, with several construction phases necessary to avoid interrupting treatment while construction is ongoing.