Enhancing ultrafiltration of algal-rich water using ferrate activated with sodium percarbonate: Foulants variation, membrane fouling alleviation, and collaborative mechanism

Lian, Jinchuan; Zhang, Lijie; Tan, Fengxun; Xu, Jingtao; Mu, Ruimin; Wu, Daoji; Liang, Heng; Cheng, Xiaoxiang

doi:10.1016/j.chemosphere.2022.136377

Cited by 17 publications

(4 citation statements)

References 59 publications

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“…Coagulation and oxidation simultaneously alleviated fouling. [15] Fe(II)/PS Ozone UF of algae-laden water Fe(II)/PS alleviated fouling. Ozonation led to algal cell lysis and thus exacerbated the fouling.…”

Section: Aops Feed Water Results Referencementioning

confidence: 99%

“…It can be found that oxidation with strong radicals, like in UV/H 2 O 2 , UV/chlorine, ultrasonic/PAA, ozonation, and UV/S(IV), may induce algal cell lysis or degradation of high molecular weight (MW) EOM to low MW, which would aggravate membrane fouling [ 9 , 10 , 11 , 12 ]. Moderate oxidation with oxidants at relatively low dosages or with iron as an activator and a coagulant always resulted in better fouling alleviation [ 8 , 12 , 13 , 14 , 15 ]. Therefore, a synergy of moderate oxidation and coagulation may be optimal for controlling algae-associated fouling.…”

Section: Introductionmentioning

confidence: 99%

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UV/Fe(II)/S(IV) Pretreatment for Ultrafiltration of Microcystis aeruginosa-Laden Water: Fe(II)/Fe(III) Triggered Synergistic Oxidation and Coagulation

Yang

Wei

et al. 2023

Membranes

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Ultrafiltration (UF) has been proven effective in removing algae during seasonal algal blooms, but the algal cells and the metabolites can induce severe membrane fouling, which undermines the performance and stability of the UF. Ultraviolet-activated sulfite with iron (UV/Fe(II)/S(IV)) could enable an oxidation-reduction coupling circulation and exert synergistic effects of moderate oxidation and coagulation, which would be highly preferred in fouling control. For the first time, the UV/Fe(II)/S(IV) was systematically investigated as a pretreatment of UF for treating Microcystis aeruginosa–laden water. The results showed that the UV/Fe(II)/S(IV) pretreatment significantly improved the removal of organic matter and alleviated membrane fouling. Specifically, the organic matter removal increased by 32.1% and 66.6% with UV/Fe(II)/S(IV) pretreatment for UF of extracellular organic matter (EOM) solution and algae-laden water, respectively, while the final normalized flux increased by 12.0–29.0%, and reversible fouling was mitigated by 35.3–72.5%. The oxysulfur radicals generated in the UV/S(IV) degraded the organic matter and ruptured the algal cells, and the low-molecular-weight organic matter generated in the oxidation penetrated the UF and deteriorated the effluent. The over-oxidation did not happen in the UV/Fe(II)/S(IV) pretreatment, which may be attributed to the cyclic redox Fe(II)/Fe(III) coagulation triggered by the Fe(II). The UV-activated sulfate radicals in the UV/Fe(II)/S(IV) enabled satisfactory organic removal and fouling control without over-oxidation and effluent deterioration. The UV/Fe(II)/S(IV) promoted the aggregation of algal foulants and postponed the shift of the fouling mechanisms from standard pore blocking to cake filtration. The UV/Fe(II)/S(IV) pretreatment proved effective in enhancing the UF for algae-laden water treatment.

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Section: Aops Feed Water Results Referencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

UV/Fe(II)/S(IV) Pretreatment for Ultrafiltration of Microcystis aeruginosa-Laden Water: Fe(II)/Fe(III) Triggered Synergistic Oxidation and Coagulation

Yang

Wei

et al. 2023

Membranes

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“…From a practical perspective, SPC is easier to handle and transport than H 2 O 2 , and is relatively stable in underground environments [11f,12] . From a cost perspective, the price per ton of liquid H 2 O 2 is three times that of SPC [12d,13] . Research has demonstrated the enormous potential of SPC as an efficient oxidant for remediating ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Construction of Phosphorus‐Doped g‐C₃N₄ Nanosheets and Activation of Sodium Percarbonate for Degradation of Organic Pollutants in Wastewater

Wang,

Gao,

Zhang

et al. 2024

ChemistrySelect

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A novel phosphorus‐doped graphitic carbon nitride nanosheets (PS‐CN) photocatalyst was prepared by thermal polycondensation and thermal stripping method, and its physicochemical properties were characterized. The results show that PS‐CN formed a thin sheet and multi‐cavity structure by thermal delamination that could enhance the surface area, light reception, and adsorption capacity. The prepared PS‐CN activated sodium percarbonate system (PS‐CN/SPC) was developed for the degradation of dyeing wastewater with methylene blue (MB) as the target pollutant and the degradation mechanism was analyzed. At room temperature (20 °C), the degradation rate of MB in PS‐CN/SPC system within 10 min (88.13 %) was three times that of pure g‐C3N4. In addition, the MB was completely degraded under visible light within 60 min. Moreover, PS‐CN exhibited excellent reusability that the degradation rates of MB have remained above 96 % in five consecutive cycles. The free radical quenching experiments showed that hole (h+), hydroxyl radical (•OH) and superoxide radical (•O2−) all participated in MB degradation, and •OH was the main active species. The PS‐CN/SPC system would provide a high‐value solution for the treatment of dye wastewater due to the low cost of raw materials, superior photocatalytic activity, simple synthesis method, and reusability of the catalyst.

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“…11,12 Ferrate (Fe(VI)) has received increasing attention in the eld of water treatment as an environmentally acceptable chemical oxidizer for the mitigation of membrane fouling. [13][14][15][16] Fe(VI) has excellent advantages for oxidizing pollutants, and nanoscale iron (hydrogen) oxides can be formed in the reduction process of Fe(VI). 17,18 They are stabilized in the treated water and can effectively react with harmful substances.…”

Section: Introductionmentioning

confidence: 99%

Coupling pretreatment of ultraviolet/ferrate (UV/Fe(vi)) for improving the ultrafiltration of natural surface water

Zhao,

Zhou

2024

RSC Adv.

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Enhancing ultrafiltration of algal-rich water using ferrate activated with sodium percarbonate: Foulants variation, membrane fouling alleviation, and collaborative mechanism

Cited by 17 publications

References 59 publications

UV/Fe(II)/S(IV) Pretreatment for Ultrafiltration of Microcystis aeruginosa-Laden Water: Fe(II)/Fe(III) Triggered Synergistic Oxidation and Coagulation

UV/Fe(II)/S(IV) Pretreatment for Ultrafiltration of Microcystis aeruginosa-Laden Water: Fe(II)/Fe(III) Triggered Synergistic Oxidation and Coagulation

Construction of Phosphorus‐Doped g‐C₃N₄ Nanosheets and Activation of Sodium Percarbonate for Degradation of Organic Pollutants in Wastewater

Coupling pretreatment of ultraviolet/ferrate (UV/Fe(vi)) for improving the ultrafiltration of natural surface water

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Enhancing ultrafiltration of algal-rich water using ferrate activated with sodium percarbonate: Foulants variation, membrane fouling alleviation, and collaborative mechanism

Cited by 17 publications

References 59 publications

UV/Fe(II)/S(IV) Pretreatment for Ultrafiltration of Microcystis aeruginosa-Laden Water: Fe(II)/Fe(III) Triggered Synergistic Oxidation and Coagulation

UV/Fe(II)/S(IV) Pretreatment for Ultrafiltration of Microcystis aeruginosa-Laden Water: Fe(II)/Fe(III) Triggered Synergistic Oxidation and Coagulation

Construction of Phosphorus‐Doped g‐C3N4 Nanosheets and Activation of Sodium Percarbonate for Degradation of Organic Pollutants in Wastewater

Coupling pretreatment of ultraviolet/ferrate (UV/Fe(vi)) for improving the ultrafiltration of natural surface water

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Construction of Phosphorus‐Doped g‐C₃N₄ Nanosheets and Activation of Sodium Percarbonate for Degradation of Organic Pollutants in Wastewater