Performance range

Activated Sludge Process

Biological Wastewater Treatment – Activated Sludge Process

WABAG experts create the optimum process combination for every individual situation through the harmonisation of the required treatment target with specific local conditions and customer needs. During this procedure, a choice can be made from a large pool of process elements.

One- and two-stage activated sludge processes are employed as key technologies. These conventional wastewater treatment methods are employed as standard solutions for average to high purification requirements. They guarantee ecological treatment for local authorities and therefore the environmentally compatible recirculation of the clarified wastewater back into the natural water cycle.

The following processes are employed as an alternative or supplement:

WABAG has comprehensive experience with wastewater treatment using activated sludge processes. During the past ten years, we have installed over 150 plants with different capacities in varying countries. Large-scale plants for the treatment of the wastewater from up to 4 million p.e. have been completed in Turkey and in China alone, more than 20 biological wastewater treatment plants are using WABAG technology. In Algeria, WABAG has built eight plants utilising the activated sludge process for 150,000 -1,500,000 p.e.

For WABAG, sludge treatment represents an integral element in an overall concept for economically optimised municipal wastewater treatment plants.


The process

Activated sludge processes essentially involve a phase in which the water to be purified is brought into contact with a bacterial floc in the presence of oxygen (aeration). This is then followed by a phase of separation from the floc (clarification). These processes actually represent an intensification of a natural phenomenon, differing only due to the increased oxygen demand created by higher concentrations of micro-organisms. Biomass separated in the clarification tank is partly recycled to the aeration stage, while the remainder goes to a sludge treatment line.

Selected references:


sustainable solutions. for a better life