Comparison of photo-Fenton, O3/H2O2/UV and photocatalytic processes for the treatment of gray water

Hassanshahi, Nahid; Karimi-Jashni, Ayoub

doi:10.1016/j.ecoenv.2018.06.039

Cited by 57 publications

(20 citation statements)

References 33 publications

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“…It was observed that with different initial pH (4.0, 7.0, 9.0, and 11.0), there was a TOC removal of 31.9, 28.6, 11.2, and 35.8%, respectively, for O 3 ; 33.1, 0.9, 0.0, and 4.1%, respectively, for UV-C; and 57.5, 37.6, 36.5, and 38.0%, respectively, for O 3 /UV-C. These results were in agreement with the work of Hassanshahi and Karimi-Jashni [77], which observed that the pH had little effect in the COD removal of gray water, by the ozonation process.…”

Section: Effect Of Phsupporting

confidence: 91%

Combination of Coagulation–Flocculation–Decantation and Ozonation Processes for Winery Wastewater Treatment

Jorge

Teixeira

Matos

et al. 2021

IJERPH

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This research assessed a novel treatment process of winery wastewater, through the application of a chemical-based process aiming to decrease the high organic carbon content, which represents a difficulty for wastewater treatment plants and a public health problem. Firstly, a coagulation–flocculation–decantation process (CFD process) was optimized by a simplex lattice design. Afterwards, the efficiency of a UV-C/ferrous iron/ozone system was assessed for organic carbon removal in winery wastewater. This system was applied alone and in combination with the CFD process (as a pre- and post-treatment). The coagulation–flocculation–decantation process, with a mixture of 0.48 g/L potassium caseinate and 0.52 g/L bentonite at pH 4.0, achieved 98.3, 97.6, and 87.8% removals of turbidity, total suspended solids, and total polyphenols, respectively. For the ozonation process, the required pH and ferrous iron concentration (Fe2+) were crucial variables in treatment optimization. With the application of the best operational conditions (pH = 4.0, [Fe2+] = 1.0 mM), the UV-C/ferrous iron/ozone system achieved 63.2% total organic carbon (TOC) removal and an energy consumption of 1843 kWh∙m−3∙order−1. The combination of CFD and ozonation processes increased the TOC removal to 66.1 and 65.5%, respectively, for the ozone/ferrous iron/UV-C/CFD and CFD/ozone/ferrous iron/UV-C systems. In addition, the germination index of several seeds was assessed and excellent values (>80%) were observed, which revealed the reduction in phytotoxicity. In conclusion, the combination of CFD and UV-C/ferrous iron/ozone processes is efficient for WW treatment.

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Section: Effect Of Phsupporting

confidence: 91%

Combination of Coagulation–Flocculation–Decantation and Ozonation Processes for Winery Wastewater Treatment

Jorge

Teixeira

Matos

et al. 2021

IJERPH

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“…According to Gulyas et al [15], at low doses of ozone, organic compounds in water can compete with hydrogen peroxide for the ozone, resulting in low rates of ROS formation. Further enhancement was observed with UV peroxonation treatment, as has been previously reported [16,65].…”

Section: H2o2/tio2 Under Visible Irradiationsupporting

confidence: 82%

“…An optimal catalyst loading, at which the maximum TOC reduction (≈31%) and the highest apparent rate constant (22.10 × 10 −4 min −1 ) was achieved, was 0.96 mg TiO 2 /cm 2 ( Figure 2 and Table 4). Above the optimal catalyst loading, the TOC removal reduced, as is commonly reported, due to screening of the photons by the increased immobilized catalyst mass [16,19], or the presence of unirradiated layers of photocatalyst [38]. Figure S3).…”

Section: Tio 2 Photocatalysismentioning

confidence: 55%

Organic Degradation Potential of Real Greywater Using TiO2-Based Advanced Oxidation Processes

Alrousan

Afkhami

Bani‐Melhem

et al. 2020

Water

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In keeping with the circular economy approach, reclaiming greywater (GW) is considered a sustainable approach to local reuse of wastewater and a viable option to reduce household demand for freshwater. This study investigated the mineralization of total organic carbon (TOC) in GW using TiO2-based advanced oxidation processes (AOPs) in a custom-built stirred tank reactor. The combinations of H2O2, O3, and immobilized TiO2 under either dark or UVA irradiation conditions were systematically evaluated—namely TiO2/dark, O3/dark (ozonation), H2O2/dark (peroxidation), TiO2/UVA (photocatalysis), O3/UVA (Ozone photolysis), H2O2/UVA (photo-peroxidation), O3/TiO2/dark (catalytic ozonation), O3/TiO2/UVA (photocatalytic ozonation), H2O2/TiO2/dark, H2O2/TiO2/UVA, H2O2/O3/dark (peroxonation), H2O2/O3/UVA (photo-peroxonation), H2O2/O3/TiO2/dark (catalytic peroxonation), and H2O2/O3/TiO2/UVA (photocatalytic peroxonation). It was found that combining different treatment methods with UVA irradiation dramatically enhanced the organic mineralization efficiency. The optimum TiO2 loading in this study was observed to be 0.96 mg/cm2 with the highest TOC removal (54%) achieved using photocatalytic peroxonation under optimal conditions (0.96 mg TiO2/cm2, 25 mg O3/min, and 0.7 H2O2/O3 molar ratio). In peroxonation and photo-peroxonation, the optimal H2O2/O3 molar ratio was identified to be a critical efficiency parameter maximizing the production of reactive radical species. Increasing ozone flow rate or H2O2 dosage was observed to cause an efficiency inhibition effect. This lab-based study demonstrates the potential for combined TiO2-AOP treatments to significantly reduce the organic fraction of real GW, offering potential for the development of low-cost systems permitting safe GW reuse.

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“…The UV/H2O2/O3 process is an efficient method against micro pollutants 4.5 [11] UV/H2O2/O3 Grey waters The highest COD removal in the process was 92% 5 [12] UV/H2O2…”

Section: Figure 1 Number Of Publications Referring To Photochemical Treatments In Recent Yearsmentioning

confidence: 99%

Photochemical treatments (UV/H2O2, UV/O3 and UV/H2O2/O3) and inverse osmosis in wastewater: Systematic review

Amaro-Soriano¹,

Hernández-Aldana²,

Rivera-Tapia³

2021

World J. Adv. Res. Rev.

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Every year, the bodies of water receive millions of cubic meters of wastewater from municipal, industrial, agricultural or livestock discharges, treated in an inadequate way or without treatment. The objective of this study was to carry out a systematic review of the frequency of use and effectiveness of the main photochemical processes and the complementation with other treatments such as it is reverse osmosis, used in different types of wastewater effluents. We searched multiple electronic databases (2010-2021), using a stepwise searching approach, supplemented with hand searching. In vitro or in vivo English language publications, original studies, and reviews were included. The database was made up of a total of 100 articles that met the minimum selection criteria, of which 25 articles the maximum scores for analysis. These articles report the improvement in the elimination of pollutants when the treatments are used together and not individually, in relatively short times ranging from 30 minutes of radiation to 8 minutes of exposure to the treatments. Regarding the type of water that was treated, most of the articles report the decontamination of natural wastewater, that is, from the industry without treatment. The percentages calculated to identify research opportunities or gaps in relation to photochemical processes (UV/H2O2/O3). As proposed some authors, if any value of the percentage of pre-selected articles (PAA %) is less than the value of the percentage of failure (MAPAA %), a research opportunity is revealed not addressed by the literature. Based on the percentage results, it is observed that there are no gaps with respect to the photochemical processes or that there are possibly no updates reported in the literature yet.

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Comparison of photo-Fenton, O3/H2O2/UV and photocatalytic processes for the treatment of gray water

Cited by 57 publications

References 33 publications

Combination of Coagulation–Flocculation–Decantation and Ozonation Processes for Winery Wastewater Treatment

Combination of Coagulation–Flocculation–Decantation and Ozonation Processes for Winery Wastewater Treatment

Organic Degradation Potential of Real Greywater Using TiO2-Based Advanced Oxidation Processes

Photochemical treatments (UV/H2O2, UV/O3 and UV/H2O2/O3) and inverse osmosis in wastewater: Systematic review

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