Etropole - Bulgaria


Capacity: 11.633 PE (60) with 3.320 m3/d

Start-up: 2014

Process: Activated sludge plant with extended aeration and floating/ moving fine bubble aeration according to BIOWORKS® design.



The municipal wastewater treatment plant is located 90 km east of Sofia in the province of the same name. The wastewater is discharged to the wastewater treatment plant by a mixed sewer canal.

The mechanical pre-treated water is distributed into two parallel-operated biological lines, which are constructed according the BIOWOKRS®-process – integrated basins for activated sludge basin an clarifier.


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