1. Full scale experiences confirmed the effctiveness of both ozonolysis and pure oxygen ATAD : two modern processes to reduce sludge and save money. 2. Sludge reduction: up to 40% and more. 3. The two processes can be considered as "mature" technologies useful for a large variety of end users. 4. In addiction pure O_2 and O_3 can be used in plants upgrading and Persistent Organic Pollutants removal, including emerging micropollutants. 5. Integrated "water" and "sludge" treatments can increase economical benefit.
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