A 140.000 PE, 15.000/30.000 m3/d capacity, complex brand new wwtp integrating the existing obsolate plant. Our involvement included complete design, engineering, installation of key technological parts of theWwTP , and operation for 1 year trial operation period. The mechanical pretreatment is followed by a 4 lane cyclical technology biological block, rainwater buffering and treating facilities. The sludge line incorporates mechanical thickening, dewatering and special flat built digesters. The produced 2700 m3/d biogas is used to generate heat and electric power. Apart from technological units, all buildings, and the entire internal infrastructure has been renewed and extended.