A comprehensive review on algae removal and control by coagulation-based processes: mechanism, material, and application

Ren, Bangxing; Weitzel, Katelin A.; Duan, Xiaodi; Nadagouda, Mallikarjuna N.; Dionysiou, Dionysios D.

doi:10.1016/j.seppur.2022.121106

Cited by 58 publications

(72 citation statements)

References 378 publications

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“…Eutrophic water is characterized by excessive nitrogen and phosphorus nutrients . The effect of N and P on the efficiency of the UV + TXC treatment is illustrated in Figure .…”

Section: Resultsmentioning

confidence: 99%

Synchronous Photooxidation–Coagulation for the Efficient Treatment of Algae-Laden Water by Utilizing Titanium Xerogel Coagulant

Wang,

Luo,

Zhou

2023

ACS EST Water

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The combination of oxidation and coagulation is an effective strategy for algae-laden water treatment. Titanium xerogel coagulant (TXC) was reported to possess dual functionalities of coagulation and photooxidation, with the latter derived from acetylacetone (AA) present in its framework structure. In this study, synchronous photooxidation−coagulation of TXC was implemented to evaluate the efficiency of treatment of algae-laden water. The results showed that treatment with ultraviolet (UV) radiation and TXC (UV + TXC) significantly improved algal removal under neutral and alkaline conditions. At a dose of 5 mg of Ti/L, the efficiency of removal of algae increased from 12.2% to 66.9% compared to that of TXC coagulation alone (pH 7.0). The enhanced coagulation mechanism involved the effects of UV irradiation on the surface charge properties of algal cells and the inhibition of algal activity. The presence of AA partially alleviated cell rupture and reduced the rate of release of algal organic matter through its intrinsic photooxidation mechanism. N and P nutrients had negligible effects on the efficiency of the UV + TXC process, whereas Fe 2+ and Cu 2+ cations had complex effects. The synchronous photooxidation−coagulation process using TXC demonstrated highly efficient treatment of algae/As(III) cocontaminated water. Further research is warranted to explore the application of TXC in a practical polluted water body.

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“…Eutrophic water is characterized by excessive nitrogen and phosphorus nutrients . The effect of N and P on the efficiency of the UV + TXC treatment is illustrated in Figure .…”

Section: Resultsmentioning

confidence: 99%

Synchronous Photooxidation–Coagulation for the Efficient Treatment of Algae-Laden Water by Utilizing Titanium Xerogel Coagulant

Wang,

Luo,

Zhou

2023

ACS EST Water

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“…159 Coagulation/precipitation is mainly used to remove ions from wastewater by adding various coagulants to form precipitates, while stimulating the generation of positively charged colloidal particles that can effectively adsorb ions and form precipitates. 160 Qiu et al reported a clean coagulationultrafiltration process for the removal of F − from semiconductor wastewater, and the residual fluoride in the UF permeate decreased from 500 to 2.1 mg L −1 . 161 As a nonporous membrane, RO membrane can repel any ions due to solutiondiffusion mechanism.…”

Section: Other Uf-based Combined Processesmentioning

confidence: 99%

Progress of Ultrafiltration-Based Technology in Ion Removal and Recovery: Enhanced Membranes and Integrated Processes

et al. 2023

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Toxic ions from industrial wastewater entail important challenges to the environment. Ultrafiltration (UF) with low operation pressure and high permeability has been widely used for macromolecules and suspended solids separation. However, UF cannot be directly used to separate ions from wastewater due to the large pore size of UF membranes. Recently, the design of enhanced UF membrane structures and UF-based integrated processes expands the application of UF for ion removal. This review aims to summarize the latest developments of UF membranes preparation as well as integrated UF processes in ion removal. First, the advanced materials for UF membranes preparation are discussed, with specific attention on active nanomaterials including inorganic materials, organic materials, and biomaterial-based materials. The design principles such as pore size control and composite thin layer fabrication of enhanced UF-based membranes for ion removal are illustrated. Next, integrated processes such as micellar-enhanced UF, polymer-enhanced UF, electro-driven UF, and other UF-based combined processes are reviewed. Finally, current application limitations and future perspectives in the enhanced UF membrane for ion removal are discussed. This review presents potential approaches for the preparation and application of enhanced UF membranes in sustainable ion removal from wastewaters.

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“…Overgrowth of phytoplankton (e.g., cyanobacteria, dinoflagellates, and diatoms) induced by climate change and anthropogenic eutrophication results in frequent outbreaks of harmful algae blooms (HABs). − HABs pose great threats to human health and aquatic ecosystems by producing toxic metabolites known as cyanotoxins including anatoxin, cylindrospermopsin, microcystin, nodularin, and saxitoxin. , More specifically, HABs cause negative impacts on drinking water safety by releasing algal toxins and taste and odor compounds, and the algal organic matter (AOM) that can serve as precursors might increase the formation of disinfection byproducts (DBPs). , Unfortunately, the negatively charged surface and steric effects make the algae relatively stable, which is difficult to be removed via conventional water treatment processes. , Therefore, oxidation by introducing ozone, ferrate, chlorine/chlorine dioxide, persulfate, and permanganate has been reported to inactivate algal cells and change their structure to enhance algae removal. − Among them, chlorine-based oxidants are the most widely used oxidants in water treatment, largely because of their low cost and wide acceptance. However, some toxic chlorinated DBPs would be generated regarding the applicability of chlorination in waterworks. , …”

Section: Introductionmentioning

confidence: 99%

Reinvestigation on the Mechanism for Algae Inactivation by the Ultraviolet/Peracetic Acid Process: Role of Reactive Species and Performance in Natural Water

Cao,

Wang,

Cheng

et al. 2023

Environ. Sci. Technol.

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This study provided an in-depth understanding of enhanced algae inactivation by combining ultraviolet and peracetic acid (UV/PAA) and selecting Microcystis aeruginosa as the target algae species. The electron paramagnetic resonance (EPR) tests and scavenging experiments provided direct evidence on the formed reactive species (RSs) and indicated the dominant role of RSs including singlet oxygen (1O2) and hydroxyl (HO•) and organic (RO•) radicals in algae inactivation. Based on the algae inactivation kinetic model and the determined steady-state concentration of RSs, the contribution of RSs was quantitatively assessed with the second-order rate constants for the inactivation of algae by HO•, RO•, and 1O2 of 2.67 × 109, 3.44 × 1010, and 1.72 × 109 M–1 s–1, respectively. Afterward, the coexisting bi/carbonate, acting as a shuttle, that promotes the transformation from HO• to RO• was evidenced to account for the better performance of the UV/PAA system in algae inactivation under the natural water background. Subsequently, along with the evaluation of the UV/PAA preoxidation to modify coagulation–sedimentation, the possible application of the UV/PAA process for algae removal was advanced.

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A comprehensive review on algae removal and control by coagulation-based processes: mechanism, material, and application

Cited by 58 publications

References 378 publications

Synchronous Photooxidation–Coagulation for the Efficient Treatment of Algae-Laden Water by Utilizing Titanium Xerogel Coagulant

Synchronous Photooxidation–Coagulation for the Efficient Treatment of Algae-Laden Water by Utilizing Titanium Xerogel Coagulant

Progress of Ultrafiltration-Based Technology in Ion Removal and Recovery: Enhanced Membranes and Integrated Processes

Reinvestigation on the Mechanism for Algae Inactivation by the Ultraviolet/Peracetic Acid Process: Role of Reactive Species and Performance in Natural Water

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