Homogeneous and heterogeneous catalytic ozonation of pulp bleaching effluent

Balcioglu, Isil Akmehmet
Moral, Cigdem Kivilcimndan
Catalytic ozonation is a promising treatment method for both water and wastewater. In this study, in order to increase the biodegradability of bleaching wastewater from an integrated pulp- and -paper production plant, granulated activated carbon-(GAC), iron-(Fe2+) and manganese-(Mn2+) ion-catalyzed ozonation processes were used as a pre-treatment process. The effects of the catalyst concentration and the initial pH (pH(i)) of wastewater on the treatment efficiency of processes were investigated. Although metal-ion-catalyzed ozonation at pH(i)=7 led to an increase in the biodegradability of wastewater a similar treatment performance was obtained by mere ozonation process at natural pH of wastewater (pH=10). The integration of ozone with GAC resulted in both higher treatment efficiency and the regeneration of GAC. The BOD5/COD ratio of bleaching wastewater increased from 0.11 to 0.29 by the application of O-3/GAC (10 g.L-1)/pH(i)=10 process within a 60-minute treatment period. While 50% overall COD removal rate was obtained by the O-3/GAC (10 g.L-1)/pH(i)=10 process overall COD removal was increased to 63% by decreasing the initial pH of wastewater to 7.

Citation Formats
I. A. Balcioglu and C. K. Moral, “Homogeneous and heterogeneous catalytic ozonation of pulp bleaching effluent,” JOURNAL OF ADVANCED OXIDATION TECHNOLOGIES, vol. 11, no. 3, pp. 543–550, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65015.