Reconstruction and expansion of the wastewater treatment plant Haiger

Expansion of the wastewater treatment plant capacity to 35,200 PE by building a new two-stage activated sludge tank and converting the existing activated sludge tank into a four-stage secondary clarifying tank. Upgrading option for the addition of a 4^th treatment stage for the elimination of micro-pollutants and conversion to anaerobic sludge stabilization.