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Homogeneous and Heterogeneous Catalytic Ozonation of Pulp Bleaching Effluent
-
Işıl Akmehmet Balcıoğlu
and
Çiğdem Kıvılcımdan Moral
Published/Copyright:
November 30, 2016
Abstract
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 (pHi) of wastewater on the treatment efficiency of processes were investigated. Although metal-ion-catalyzed ozonation at pHi=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 O3/ GAC (10g.L-1)/pHi=10 process within a 60-minute treatment period. While 50% overall COD removal rate was obtained by the O3/GAC (10 g.L-1)/pHi=10 process overall COD removal was increased to 63% by decreasing the initial pH of wastewater to 7.
Keywords: Advanced oxidation process; Pulp and paper industry wastewater; Catalytic ozonation; Ozonation
Received: 2008-3-27
Revised: 2008-6-9
Accepted: 2008-6-11
Published Online: 2016-11-30
Published in Print: 2008-8-1
© 2016 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Advanced oxidation process;
Pulp and paper industry wastewater;
Catalytic ozonation;
Ozonation
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