AOX removal from pulp and paper wastewater by Fenton and photo-Fenton processes: A real case-study


D-0 bleaching wastewater from E. globulus Kraft pulping industry was treated by Fenton and photo-Fenton processes. The aim was to optimize the operational conditions for adsorbable organic halides (AOX) removal, namely oxidant concentration, [H2O2], catalyst concentration, [Fe2+], and treatment time, using the central composite experimental design (CCED) tool. Temperature and pH were set at 60 degrees C and 2, respectively, which are similar to the natural values of the D-0 bleaching wastewater. Both processes showed potential to remove AOX from D-0 with 177 - 178 mM H2O2 and 10 min reaction time. Maximum AOX removal was 85 % for the Fenton process with 8.5 mM Fe2+, and 95 % for the photo-Fenton process with 2.0 mM Fe2+ and UV irradiance 142 W.m(-2). For both methods, the only statistically significant variable (p=0.05) was the concentration of oxidant, [H2O2]. (C) 2019 Published by Elsevier Ltd.



subject category

Energy & Fuels


Ribeiro, JP; Marques, CC; Portugal, I; Nunes, MI

our authors


This work was financed by Portugal 2020 through European Regional Development Fund (ERDF) in the frame of Operational Competitiveness and Internationalization Programme (POCI) in the scope of Project PROTEUS - POCI01-0247-FEDER-017729. J.P. Ribeiro acknowledges FCT, Portugal -Fundacao para a Ciencia e a Tecnologia, I.P. for the PhD Grant (SFRH/BD/141133/2018). Thanks also due to FCT/MCTES, Portugal for the financial support to CESAM (FCT Ref. UID/AMB/50017/2019) and CICECO, Portugal (FCT Ref. UID/CTM/50011/2019), through national funds.

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