A moderate activated sulfite pre-oxidation on ultrafiltration treatment of algae-laden water: Fouling mitigation, organic rejection, cell integrity and cake layer property

Liu, Wenkai; Yang, Kaihan; Qu, Fangshu; Liu, Bin

doi:10.1016/j.seppur.2021.120102

Cited by 25 publications

(2 citation statements)

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“…[10] Fe(II)/S(IV) UF of algae-laden water Fouling was alleviated and the algal cell was intact. [14] PAA UV/PAA Ultrasonic/PAA UF of algae-laden water Fouling control: UV/PAA > PAA > Ultrasonic/PAA High dosage of PAA (> 10 mg/L) and ultrasonic led to algal cell rupture. [11] Fe(VI)/SPC UF of algae-laden water Fouling was alleviated and the algal cell was intact.…”

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%