This chapter describes the most recent advances in ozone application for pulp and paper wastewater treatment. Ozone’s unique features and production processes are described in detail, underlining its growing applications in drinking water and wastewater as well as the advantages and downsides related to its specific utilization to treat pulp and paper effluents. A detailed review of the most recent literature studies regarding pulp and paper ozonation is successively made, including not only ozonation alone but also its utilization in combined processes (such as catalytic ozonation and ozonation followed by biofiltration), which is becoming more and more common. Finally, the most relevant economic and environmental aspects related to ozone treatment of pulp and paper wastewater are discussed to give a thorough overview to the reader.
