Advanced oxidation process H2 O2 /UV combined with anaerobic digestion to remove chlorinated organics from bleached kraft pulp mill wastewater


  • Diego Botelho Ruas University of São Paulo
  • Tatiana Rodríguez Chaparro Military University
  • Eduardo Cleto Pires University of São Paulo



bleaching effluents, recalcitrant organic matter, AOX, biodegradability ratio, advanced oxidation process


This study investigated the application of an advanced oxidation process combining hydrogen peroxide with ultraviolet radiation (H2 O2 /UV) to remove recalcitrant compounds from Kraft bleaching effluent. Anaerobic pre-treatment was performed to remove easily degraded organics using a horizontal-flow anaerobic immobilized biomass (HAIB) reactor. Bleaching plant effluent was treated in the HAIB reactor processed over 19 h of hydraulic retention time (HRT), reaching the expected removal efficiencies for COD (61 ± 3%), TOC (69 ± 9%), BOD5 (90 ± 5%) and AOX (55 ± 14%). However, the anaerobic treatment did not achieve acceptable removal of UV254 compounds. Furthermore, there was an increase of lignin, measured as total phenols. The H2 O2 /UV post-treatment provided a wide range of removal efficiencies depending on the dosage of hydrogen peroxide and UV irradiation: COD ranged from 0 to 11%, UV254 from16 to 35%, lignin from 0 to 29% and AOX from 23 to 54%. All peroxide dosages applied in this work promoted an increase in the BOD5 /COD ratio of the wastewater. The experiments demonstrate the technical feasibility of using H2 O2 /UV for posttreatment of bleaching effluents submitted to anaerobic pre-treatment.

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Author Biographies

Diego Botelho Ruas, University of São Paulo

Hydraulics and Sanitary Engineering Department. School of Engineering of São Carlos.

Tatiana Rodríguez Chaparro, Military University

Civil Engineering Department.

Eduardo Cleto Pires, University of São Paulo

Hydraulics and Sanitary Engineering Department. School of Engineering of São Carlos.


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How to Cite

Botelho Ruas, D., Rodríguez Chaparro, T., & Cleto Pires, E. (2012). Advanced oxidation process H2 O2 /UV combined with anaerobic digestion to remove chlorinated organics from bleached kraft pulp mill wastewater. Revista Facultad De Ingeniería Universidad De Antioquia, (63), 43–54.

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