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.


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Citation Formats
I. A. Balcioglu and C. K. Moral, “Homogeneous and heterogeneous catalytic ozonation of pulp bleaching effluent,” JOURNAL OF ADVANCED OXIDATION TECHNOLOGIES, pp. 543–550, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65015.