Project report: Rehabilitation and extension of the Sewage Treatment Plant in Cluj-Napoca
In 2013 we were involved as subcontractors in the works contract "Rehabilitation and extension of the Sewage Treatment Plant in Cluj-Napoca".
The major objective of this project set from the design phase was to offer the customer, the regional operator Compania de Apă Someș S. A, a modern sewage treatment plant able to process, treat and purify the entire volume of grey waters from Cluj-Napoca and the upstream pre-urban area. 
More precisely, the plant was designed with a capacity of 375.000 inhabitants equivalent and a maximum outlet volume of 130.000 m3/day.
The works included the rehabilitation and extension of 4 major objectives:
1. Mechanical treatment
- the distribution chamber
- coarse and dense grills station
- desilting unit and și fat separator
- rehabilitation of primary mechanical treatment clarifiers and extension with two new clarifiers
- primary sludge pumping station
2. Biological treatment
- rehabilitation of existing aeration basins and construction of new ones
- construction of a new blower station
- construction of 6 new secondary clarifiers
- active recirculated sludge pumping station
3. The sludge line
- rehabilitation of the 4 existing sludge pre-thickeners
- construction of 4 new digesters (methane tanks)
- rehabilitation of the 2 existing sludge post-thickeners
- construction of the excess sludge thickening station
- construction of an intermediary sludge container
- rehabilitation of the existing gasometer and the construction of a new one
- construction of the bio-gas-powered electric power plant
4. The administrative pavilion
- laboratory for biological, physical and chemical analysis
- offices for employees that run the daily plant operations
- local SCADA control room
- mechanical and electrical workshop
At the completion of this project the sewage treatment plant in Cluj-Napoca became the most modern in the country and second in size only to the one in Bucharest.
The upgrading of the sewage plant in Cluj-Napoca is part of the larger investment program called "Extension and rehabilitation of water and sewage systems in Cluj and Salaj counties" - program implemented by the regional water operator company between 2008-2013, co-financed by the EU and of Eur 196,9 million in total value.
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Project report leaflet The Sewage Treatment Plant in Cluj-Napoca
The Commercial Department