Comparison of UV-A photolytic and UV/TiO2 photocatalytic effects on Microcystis aeruginosa PCC7813 and four microcystin analogues: A pilot scale study

Menezes, Indira; Neto, José Capelo; Pestana, Carlos J.; Clemente, Allan; Hui, Jianing; Irvine, John T. S.; Gunaratne, H. Q. Nimal; Robertson, Peter K. J.; Edwards, Christine; Gillanders, Ross N.; Turnbull, Graham A.; Lawton, Linda A.

doi:10.1016/j.jenvman.2021.113519

Cited by 11 publications

(3 citation statements)

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“…[ 33 , 58 , 61 ] For the removal of cyanotoxins from water, SR‐AOPs were mainly studied for the removal of ATX, MCs, and CYN, focusing on UV and catalyst activation as shown in Table 2 . [ 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 ]…”

Section: Removal Of Cyanotoxins From the Watermentioning

confidence: 99%

A Perspective on Removal of Cyanotoxins from Water Through Advanced Oxidation Processes

Verma,

Kumar,

Lavrenčič Štangar

2023

Global Challenges

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This perspective discusses the challenges associated with the removal of cyanotoxins from raw water sources for drinking water treatment and the emergence of sulfate radical‐based advanced oxidation processes (SR‐AOPs) as an effective treatment technique. The advantage of SR‐AOPs is that they can be activated using a variety of methods, including heat, UV radiation, and transition metal catalysts, allowing for greater flexibility in treatment design and optimization. In addition, the byproducts of SR‐AOPs are less harmful than those generated by •OH‐AOPs, which reduces the risk of secondary contamination. SR‐AOPs generate sulfate radicals (SO4•−) that are highly selective to certain organic contaminants and have lower reactivity to background water constituents, resulting in higher efficiency and selectivity of the process. The presence of natural organic matter and transition metals in the natural water body increases the degradation efficiency of SR‐AOPs for the cyanotoxins. The bromate formation is also suppressed when the water contaminated with cyanotoxins is treated with SR‐AOPs.

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Section: Removal Of Cyanotoxins From the Watermentioning

confidence: 99%

A Perspective on Removal of Cyanotoxins from Water Through Advanced Oxidation Processes

Verma,

Kumar,

Lavrenčič Štangar

2023

Global Challenges

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“…Pestana et al (2015) demonstrated that TiO 2 coated thin-walled, hollow glass spheres could decompose eleven different congeners of microcystins within several minutes under high-energy UV light irradiation (450 W). Furthermore, Pestana et al, 2020b andMenezes et al (2021) demonstrated the successful removal of the cyanobacterium Microcystis aeruginosa and four of the MC congeners it produces using TiO 2 coated buoyant glass beads using UV-light emitting diodes.…”

Section: Introductionmentioning

confidence: 99%

Solar-driven semi-conductor photocatalytic water treatment (TiO2, g-C3N4, and TiO2+g-C3N4) of cyanotoxins: Proof-of-concept study with microcystin-LR

et al. 2023

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“…A variety of advanced strategies, including activated carbon adsorption, ozone decomposition, photolysis, membrane filtration, and other methods, have been studied to remove algal toxins from water [16][17][18][19]. Membrane separation technologies have established themselves as essential processes of water purification and wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Removal of Algae and Algal Toxins from a Drinking Water Source Using a Two-Stage Polymeric Ultrafiltration Membrane Process

Zhang,

Xiong,

Zhang

et al. 2023

Polymers

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The release of algal toxins in algae-containing water sources poses a serious threat to drinking water safety and human health. The conventional water treatment processes of water plants have a limited ability to remove algae and algal toxins, especially algal toxins with a molecular weight (MW) of less than 1000 Da. To eliminate algal pollution from a water source, a two-stage ultrafiltration (UF) process with a large polysulfone hollow fiber membrane with a MW cut-off of 200 kDa and a small aromatic polyamide roll membrane with a MW cut-off of 1 kDa were applied after a traditional sand filter in a water treatment plant. UF operation conditions, including the operating time, pressure, and membrane flux, were investigated. With an operating pressure of 0.05–0.08 MPa, the polysulfone hollow fiber membrane removed algae effectively, as the influent algal cell concentration ranged from 1–30 cells/mL but exhibited a limited removal of algal toxins. With an operating pressure of 0.3–0.4 MPa, the elimination of microcystins (MCs) reached 96.3% with the aromatic polyamide roll membrane. The operating pressure, membrane flux, and operating time were selected as the experimental factors, and the effects on the UF efficiency to remove algal toxins and biodegradable dissolved organic carbon were investigated by the response surface methodology. The model showed that the order of influence on the membrane operating efficiency was operating pressure > membrane flux > running time. The optimal UF operating conditions were an operating pressure of 0.3 MPa, a membrane flux of 17.5 L/(m2·h), and a running time of 80 min.

show abstract

Comparison of UV-A photolytic and UV/TiO2 photocatalytic effects on Microcystis aeruginosa PCC7813 and four microcystin analogues: A pilot scale study

Cited by 11 publications

References 50 publications

A Perspective on Removal of Cyanotoxins from Water Through Advanced Oxidation Processes

A Perspective on Removal of Cyanotoxins from Water Through Advanced Oxidation Processes

Solar-driven semi-conductor photocatalytic water treatment (TiO2, g-C3N4, and TiO2+g-C3N4) of cyanotoxins: Proof-of-concept study with microcystin-LR

Removal of Algae and Algal Toxins from a Drinking Water Source Using a Two-Stage Polymeric Ultrafiltration Membrane Process

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