Evaluation of color and COD removal by Fenton from biologically (SBR) pre-treated pulp and paper wastewater

[Display omitted] Pulp and paper industry has generated a higher contamination burden of the final mill wastewater which must be further treated to comply with the standards imposed by the legislation requirement. In this study, the removal efficiencies for chemical oxygen demand (COD) and color fro...

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Bibliographic Details
Published in:Process safety and environmental protection 2018-05, Vol.116, p.82-91
Main Authors: Abedinzadeh, Niloofar, Shariat, Mahmood, Monavari, Sayed Masoud, Pendashteh, Alireza
Format: Article
Language:English
Subjects:
Batch reactors
Chemical oxygen demand
Color
Color removal
Combined treatment
Contamination
Cycle time
Design optimization
Fenton
Hydrogen peroxide
Iron
Legislation
Organic chemistry
Oxidation
Paper industry wastes
Pretreatment
Pulp
Pulp & paper industry
Pulp and paper wastewater
Reaction time
Reduction
Response surface methodology
RSM
SBR
Wastewater
Wastewater treatment
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Summary:[Display omitted] Pulp and paper industry has generated a higher contamination burden of the final mill wastewater which must be further treated to comply with the standards imposed by the legislation requirement. In this study, the removal efficiencies for chemical oxygen demand (COD) and color from pulp and paper wastewater using sequencing batch reactor (SBR) in combination with advanced oxidation processes (AOPs) at a bench scale were investigated. Response surface methodology (RSM) based on a three-variable-three-level central composite design (CCD) was employed to optimize the SBR process. At the optimal conditions of initial COD of 1000mg/L, MLSS of 3000mg/L and cycle time of 24h, 74.8% COD, 58.3% of color removal and 80mL/g of SVI were obtained in the pretreatment stage. The use of Fenton oxidation as post-treatment enhanced COD reduction and color removal. A percentage of 92.1% COD reduction and 90.3% of color removal was achieved in dosages of 3mM Fe2+ and 9mM H2O2 at pH of 3.0 for a reaction time of 30min, while a total of 98% reduction of COD and 94% removal of color for the combined treatment was achieved.
ISSN:0957-5820
1744-3598
DOI:10.1016/j.psep.2018.01.015