resumo
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.
palavras-chave
ADVANCED OXIDATION PROCESSES; EFFLUENTS; INDUSTRY
categoria
Energy & Fuels
autores
Ribeiro, JP; Marques, CC; Portugal, I; Nunes, MI
nossos autores
Inês Portugal
Professor AuxiliarProjectos
Produtos e Tecnologias para o sector do Eucalyptus Globulus (PROTEUS)
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2019)
agradecimentos
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.