Project relates to two frameworks:

• upgrade of existing plant to tertiary process,
• input plant and sludge entry.

The existing purifying plant Domžale-Kamnik will be upgraded with a new biological purifying process using suspended biomass in sequent tanks with input selectors. Upgrade of the existing plant covers the building of new constructions for the biological water stage, tanks, and sludge thickeners, processing of sludge, and disintegration of the exit sludge before entering the exit pumps together with decreasing of nitrogen in the sludge water.