Integration of processes induced air flotation and photo-Fenton for treatment of residual waters contaminated with xylene

Silva, Syllos S. da; Chiavone‐Filho, Osvaldo; Neto, Eduardo Lins de Barros; Nascimento, Cláudio Augusto Oller do

doi:10.1016/j.jhazmat.2011.10.070

Cited by 29 publications

(15 citation statements)

References 29 publications

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“…The reason for this is that when the amount of H 2 O 2 is increased from 100 to 1000 mg L −1 , the • OH concentration increases too and enhances the removal of pollutants. 29 Similar results were obtained by da Silva et al, 30 who also got a higher level of organic matter removal with a higher load of reagent. The best results are obtained using UV, since the reaction is enhanced and additional • OH is generated, producing the regeneration of the catalyst (Eqn (5)).…”

Section: Resultssupporting

confidence: 81%

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Fenton and solar photo‐Fenton processes in the depuration of wastewater resulting from production of grape juice. A factorial design

Poblete

Cortés

Maldonado

2020

J of Chemical Tech & Biotech

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BACKGROUND Grapes used in the production of juice have high total phenolic content due to the undesirable fermentation process, consequence of the high content of sugar ant fatty acids in grapes, which produce a high amount of ethanol. Therefore, the amount of wastewater with a high concentration of organic matter is an environmental concern related to juice production. We evaluated the potential of the use of these Fenton and photo‐Fenton processes in the depuration of organic matter in the juice production wastewater and determined the factors that affect the treatment. RESULTS We obtained different levels of organic matter removal, with a higher level for the experimental conditions, that is, a high concentration of H2O2 and Fe+2 and the use of UV irradiation (photo‐Fenton). In this case, COD and polyphenol elimination was 70.2 % and 36.1%, respectively, with juice wastewater under no pretreatment and applying UV irradiation. The most important factor in the removal of COD in juice wastewater was the concentration of Fe+2, followed by H2O2 and the presence of solar UV. The most important factor in the removal of polyphenols is the pretreatment of the juice wastewater, with better results whenthere is no pretreatment. The highest removal of polyphenols was obtained using the water without being pretreated. CONCLUSIONS The specific energy consumption and the electrical energy per order under the photo‐Fentonprocess was lower than under the Fenton process, indicating a more efficient energy use. This is because the natural UV irradiation enhances the chemical reaction of the oxidation process, producing a higher difference in the concentration of COD and polyphenols in comparison to the process carried out without UV solar irradiation. © 2019 Society of Chemical Industry

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Section: Resultssupporting

confidence: 81%

“…The reason for this is that when the amount of H 2 O 2 is increased from 100 to 1000 mg L −1 , the • OH concentration increases too and enhances the removal of pollutants . Similar results were obtained by da Silva et al ., who also got a higher level of organic matter removal with a higher load of reagent.…”

Section: Resultsmentioning

confidence: 99%

Fenton and solar photo‐Fenton processes in the depuration of wastewater resulting from production of grape juice. A factorial design

Poblete

Cortés

Maldonado

2020

J of Chemical Tech & Biotech

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“…First-order kinetics for oil/water separation has also been found by other researchers [32][33][34].…”

Section: Flotation Kineticssupporting

confidence: 74%

Oil removal of oilfield-produced water by induced air flotation using nonionic surfactants

Silva

Chiavone‐Filho

Neto

et al. 2014

Desalination and Water Treatment

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A B S T R A C TOil separation from produced water is commonly carried out at oilfields for resource recovery as well as environmental reasons. In this work, the separation of oil by induced air flotation was studied in a batch unit. A series of nonionic surfactants with different hydrophile-lipophile balance (HLB) values were used as a flotation agent. The effects of different HLB values and surfactant concentration on the oil removal of oilfield produced water were investigated. The removal rate constant (k) was determined and the flotation process followed first-order kinetics. The maximum oil removal obtained was approx. 80% after 4 min of flotation.

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“…A plot of -Ln (C/C 0 ) versus reaction time (t) yields a straight line, and the slop is obvious rate constant (k). Here, C and C 0 are initial COD and TPH concentrations of the MWF wastewater or DAF effluent and final COD and TPH concentrations after t min of reaction [53,60,61].…”

Section: Kinetic Study and Cost Analysismentioning

confidence: 99%

In situ treatment of metalworking wastewater by chemical addition-dissolved air flotation coupled with UV, H2O2 & ZnO

Mofrad

Pourzamani

Amin

et al. 2020

Heliyon

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The hybrid treatment techniques have been proven that could be a proper solution to the metalworking fluid (MWF) wastewaters disposal challenge. Hence, this investigation was conducted aim to the assessment of chemical addition-dissolved air floatation (CA-DAF) unit followed with a heterogeneous photocatalytic (PC) process as UV/H 2 O 2 /ZnO to treat MWF wastewater produced in one of the central industrial estates in the Middle East. The CA-DAF unit was implemented as trial and errors and had an appropriate efficiency. However, the environmental discharge standards were not achieved only by this unit, so that, a PC process considered for this purpose in a pilot-scale reactor. And also, Chemical oxygen demand (COD), total petroleum hydrocarbons (TPHs) were considered as physicochemical parameters to analyze the applied photochemical reaction throughout the concentrations of ZnO and H 2 O 2 , and pH value as variables of the study. The ideal and optimized conditions were observed at pH 10, 600 mg l À1 of ZnO, and 13.11 g l À1 of H 2 O 2 via 99.87% and 97.9% reduction rates in total COD and TPH, respectively. These removal rates were obtained for this integrated strategy under the optimized reaction. By evaluating the synergistic effect, it was found that UV/ZnO could be a predominant reaction in this process. The organic and intermediates analysis appeared 78.46% reduction for all detected organic matters. Besides, PC generation of bis phthalate, mono phthalate, benzene, and benzoic acid to 2,6-bis (1,1-dimethylethyl)-4-mthyl phenol was the reason of the residual phenolic compound concentration in the reaction solution with low removal rate. The kinetic study showed that this reaction could be well fitted with the pseudo-first-order kinetic model by R 2 equal with 0.973 and 0.988 in turn for COD and TPH. The expenditures to treat 1 m 3 of the CA-DAF was estimated at 5.335 us$ via cost analysis. Finally, the collected findings indicate that CA-DAF integrated with UV/H 2 O 2 /ZnO can be an efficient approach in the MWF wastes disposal or treatment for reuse.

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Integration of processes induced air flotation and photo-Fenton for treatment of residual waters contaminated with xylene

Cited by 29 publications

References 29 publications

Fenton and solar photo‐Fenton processes in the depuration of wastewater resulting from production of grape juice. A factorial design

Fenton and solar photo‐Fenton processes in the depuration of wastewater resulting from production of grape juice. A factorial design

Oil removal of oilfield-produced water by induced air flotation using nonionic surfactants

In situ treatment of metalworking wastewater by chemical addition-dissolved air flotation coupled with UV, H2O2 & ZnO

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