SOMAGUE Engenharia, S.A.
This detailed design entails the Wastewater Treatment Plants of Afonsoeiro and Seixalinho, dimensioned to serve an equivalent population of 48 000 (average flow: WWTP Afonsoeiro: 11.500 m³/day; WWTP Seixalinho: 4 400 m³/day). The WWTPs include the following operations:
- Reception and preliminary treatment of the septic tanks effluents; Preliminary treatment (screening and sand retention / degreasing, with aerobic biological treatment of grease); Equalisation-homogenisation in aerated lake; Intermediate pumping; Secondary treatment in 4 Sequential Batch Reactors (SBR); Final disinfection with UV radiation.
- Thickening in gravitational thickener; Storage of thickened sludge; Mechanical dehydration in centrifuges; Lime addition.
- Ventilation system (polluted air extraction) in the entrance and sludge treatment buildings; Chemical deodorization unit.
The project also includes two underwater outfalls: one with a length of 200 m, in HDPE, DN 560, and another with a length of 300 m, in HDPE, DN 710.
Detailed Design including all the ancillary works and services.