Application of the central composite design to mineralization of olive mill wastewater by the electro/FeII/persulfate oxidation method

Görmez, Fatma; Görmez, Özkan; Yabalak, Erdal; Gözmen, Belgin

doi:10.1007/s42452-020-1986-y

Cited by 27 publications

(7 citation statements)

References 64 publications

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“…The authors have concluded that, although higher applied voltage attained higher COD removal, it is not the best choice from the economic point of view. The same conclusion was attained by Görmez et al [ 38 ], while treating an olive mill wastewater by electro/Fe 2+ /PDS process.…”

Section: Treatment Of Complex Wastewater Matrices By Electro-persulfate Processessupporting

confidence: 85%

“…Persulfate electro-activation with metal ions addition was applied in the treatment of SLL [ 35 ], SLL nanofiltration concentrate [ 36 ], mixed industrial wastewater [ 37 ], olive mill wastewater [ 38 ], and dyeing wastewater [ 24 ]. Table 3 summarizes the conditions used in these studies, as well as the main results obtained.…”

Section: Treatment Of Complex Wastewater Matrices By Electro-persulfate Processesmentioning

confidence: 99%

“…Among the several operational parameters that affect the effectiveness of the electro-persulfate treatment, PS concentration is one of the major factors that limit the performance of the process [ 38 ]. To evaluate the influence of PDS concentration on the COD removal from a SLL, Zhang et al [ 35 ] performed experiments where the added PDS concentration was varied from 15.6 to 62.5 mM, and observed an increase in COD removal with PDS concentration.…”

Section: Treatment Of Complex Wastewater Matrices By Electro-persulfate Processesmentioning

confidence: 99%

“…From the results presented, it can be concluded that there is an optimal PS concentration for the efficient electro-persulfate process through the addition of metal ions, above which sulfate radicals became less available for the pollutants oxidation. Furthermore, a study performed by Görmez et al [ 38 ] discloses a synergistic effect of PS and iron concentrations on COD removal.…”

Section: Treatment Of Complex Wastewater Matrices By Electro-persulfate Processesmentioning

confidence: 99%

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Electro-Persulfate Processes for the Treatment of Complex Wastewater Matrices: Present and Future

et al. 2021

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Complex wastewater matrices present a major environmental concern. Besides the biodegradable organics, they may contain a great variety of toxic chemicals, heavy metals, and other xenobiotics. The electrochemically activated persulfate process, an efficient way to generate sulfate radicals, has been widely applied to the degradation of such complex effluents with very good results. This review presents the fundamentals of the electro-persulfate processes, highlighting the advantages and limitations, followed by an exhaustive evaluation on the application of this process for the treatment of complex industrial effluents. An overview of the main relevant experimental parameters/details and their influence on the organic load removal is presented and discussed, having in mind the application of these technologies at an industrial scale. Finally, the future perspectives for the application of the electro-persulfate processes in the treatment of complex wastewater matrices is outlined.

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Section: Treatment Of Complex Wastewater Matrices By Electro-persulfate Processessupporting

confidence: 85%

Section: Treatment Of Complex Wastewater Matrices By Electro-persulfate Processesmentioning

confidence: 99%

Section: Treatment Of Complex Wastewater Matrices By Electro-persulfate Processesmentioning

confidence: 99%

Section: Treatment Of Complex Wastewater Matrices By Electro-persulfate Processesmentioning

confidence: 99%

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Electro-Persulfate Processes for the Treatment of Complex Wastewater Matrices: Present and Future

et al. 2021

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“…The hydroxyl radicals react through unselective multi-step pathways, which limits the process efficiency [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Persulfate Process Activated by Homogeneous and Heterogeneous Catalysts for Synthetic Olive Mill Wastewater Treatment

Domingues

Silva

Vaz

et al. 2021

Water

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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.

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Alternative treatment of olive mill wastewater by combined sulfate radical‐based advanced electrocoagulation processes

Yazici Guvenc,

Tunc

2023

Water Environment Research

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The aim of this study is to investigate the performance of advanced electrocoagulation (EC) process for the treatment of olive mill wastewater. In EC process, iron plates were used as electrodes, and peroxydisulfate (PS) and peroxymonosulfate (PMS) were added as oxidants. The effects of the initial pH value, current density, oxidant dose, and electrolysis time were optimized for pollutant removal from olive mill wastewater by EC‐PS and EC‐PMS processes. Control experiments showed that addition of oxidants to the conventional EC process increased the pollutant removal efficiency. Classical optimization method was used to determine optimum conditions, which were initial pH 4, current density 40 mA/cm2, oxidant dose 5 g/L, and electrolysis time 30 min for both processes. Under these conditions, EC‐PS and EC‐PMS processes achieved 50.5% and 48.9% chemical oxygen demand (COD), 93.8% and 89.3% total phenol, 87.7% and 83% UV254, and 74.5% and 64.1% total suspended solid removal efficiencies. Quenching experiments were performed to determine the dominant radical species participating in the processes. It was observed that hydroxyl and sulfate radicals were involved in both processes but hydroxyl radicals were more active. Specific energy consumption was calculated as 5.90 kWh/kg COD for EC process, 4.95 kWh/kg COD for EC‐PS process, and 5.20 kWh/kg COD for EC‐PMS process. The organic removal/sludge ratio of EC‐PS process was found to be higher with 17.5 g/L value. Although the application of EC‐PS and EC‐PMS processes alone is insufficient to meet the discharge limits, they have been found to be effective in olive mill wastewater treatment.Practitioner Points Peroxydisulfate (PS) and peroxymonosulfate (PMS)‐based advanced electrocoagulation (EC) was used in olive mill wastewater treatment. 50.5% chemical oxygen demand (COD), 93.8% TP, 87.7% UV254, and 74.5% TSS removals were achieved by EC‐PS. 48.9% COD, 89.3% TP, 83% UV254, and 64.1% TSS removals were obtained by EC‐PMS. Hydroxyl and sulfate radicals were involved in both processes.

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Application of the central composite design to mineralization of olive mill wastewater by the electro/FeII/persulfate oxidation method

Cited by 27 publications

References 64 publications

Electro-Persulfate Processes for the Treatment of Complex Wastewater Matrices: Present and Future

Electro-Persulfate Processes for the Treatment of Complex Wastewater Matrices: Present and Future

Persulfate Process Activated by Homogeneous and Heterogeneous Catalysts for Synthetic Olive Mill Wastewater Treatment

Alternative treatment of olive mill wastewater by combined sulfate radical‐based advanced electrocoagulation processes

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