Sustainable iron-olive stone-based catalysts for Fenton-like olive mill wastewater treatment: Development and performance assessment in continuous fixed-bed reactor operation

• Type: Article in International Scientific Journal
• Date: 2022

Authors

Bruno M. Esteves (Author) FEUP; Sergio Morales-Torres (Author) Other; Francisco J. Maldonado-Hódar (Author) Other; Luís Madeira (Author) FEUP

Journal

Title: Chemical Engineering Journal

Vol. 435

Pages: 1-14

ISSN: 1385-8947

Publisher: Elsevier

Indexing

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Associated Projects

Healthy Waters - Healthy Waters - Identification, Elimination, Social Awareness and Education of Water Chemical and Biological Micropollutants with Health and Environmental Implications

Other information

Authenticus ID: P-00W-1KT

DOI: 10.1016/j.cej.2022.134809

Abstract (EN): Iron oxide catalysts supported on activated carbon prepared from olive stones (OSAC-Fe) were used for the catalytic wet peroxide oxidation of refractory polyphenolic solutions and real olive mill wastewater (OMW) in a fixed-bed reactor (FBR). Catalysts were prepared with different precursors and Fe-loadings. The resulting catalysts were essentially microporous materials with well-developed surface areas (S-BET = 588-689 m(2)/g), whereas the nature and distribution of metallic nanoparticles were found to be strongly dependent on the precursor used. The stability and catalytic performance were screened in a batch reactor using a synthetic solution and the most promising catalyst - prepared at 5 wt.% Fe using Fe(NO3)(3) as the precursor - was selected for the operation of a continuous FBR. Different operational conditions were evaluated through a parametric study. At 60 ?degrees C, [H2O2](feed) = 1.5 g/L and Q = 0.75 mL/min, 87% total phenolic content removal (TPh), 28% mineralization and 88% H2O2 conversion were achieved at steady-state. Real OMW samples were then treated at a fixed [H2O2]/[COD] in the feed, and TPh removals of 57-71% and COD (chemical oxygen demand) reductions of 26-34% were attained. The resulting effluents showed an overall reduction of eco-toxicity and improvement of biodegradability indices.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 14