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Title: Persulfate Process Activated by Homogeneous and Heterogeneous Catalysts for Synthetic Olive Mill Wastewater Treatment
Authors: Domingues, Eva 
Silva, Maria João 
Vaz, Telma 
Gomes, João 
Martins, Rui C. 
Keywords: Heterogeneous catalysis; Homogeneous catalysis; Sulfate radical based advanced oxidation process ; Toxicity; Synthetic olive mill wastewater; Toxicity
Issue Date: 2021
Project: POCI-01-0247-FEDER-033193 
FCT PhD Grant (SFRH/BD/144096/2019 
FCT (CEECIND/01207/2018) 
Serial title, monograph or event: Water (Switzerland)
Volume: 13
Issue: 21
Abstract: Wastewaters from the olive oil industry are a regional environmental problem. Their phenolic content provides inherent toxicity, which reduces the treatment potential of conventional biological systems. In this study, Sulfate Radical based Advanced Oxidation Processes (SRbAOPs) are compared with advanced oxidation processes (namely Fenton’s peroxidation) as a depuration alternative. Synthetic olive mill wastewaters were submitted to homogeneous and heterogeneous SRbAOPs using iron sulfate and solid catalysts (red mud and Fe-Ce-O) as the source of iron (II). The homogenous process was optimized by testing different pH values, as well as iron and persulfate loads. At the best conditions (pH 5, 300 mg/L of iron and 600 mg/L of persulfate), it was possible to achieve 39%, 63% and 37% COD, phenolic compounds and TOC removal, respectively. The catalytic potential of a waste (red mud) and a laboratory material (Fe-Ce-O) was tested using heterogenous SRbAOPs. The best performance was achieved by Fe-Ce-O, with an optimal load of 1600 mg/L. At these conditions, 27%, 55% and 5% COD, phenolic compounds and TOC removal were obtained, respectively. Toxicity tests on A. fischeri and L. sativum showed no improvements in toxicity from the treated solutions when compared with the original one. Thus, SRbAOPs use a suitable technology for synthetic OMW.
ISSN: 2073-4441
DOI: 10.3390/w13213010
Rights: openAccess
Appears in Collections:I&D CIEPQPF - Artigos em Revistas Internacionais

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