The total capacity is more than 1 090 000 population equivalents. The capacity of a sludge treatment unit is 260 m3of sludge per day with 5% of dry matter. A sliding framework was used when concreting 8large-sized thin-walled bound digestion tanks (each with a volume of 7000 m 3). When constructing the activation tanks a large-scale framework was used and a round large-scaled framework was used with the secondary sedimentation tank.