Analysis on the flocculation characteristics of algal organic matters

Sun, Feng; Wang, Fengyi; Jiang, Huanglin; Huang, Qinyun; Xu, Chenhui; Yu, Peng; Cong, Haibing

doi:10.1016/j.jenvman.2021.114094

Cited by 11 publications

(4 citation statements)

References 26 publications

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“…Also, some studies did not measure fluorescence at excitation wavelengths >400 nm (e.g., Yang et al 24 ), which would preclude identification of this peak. Studies evaluating cyanobacteria and waters with algal blooms have uncovered other algal-associated peaks, [47][48][49] but none of the algal-associated peaks are in the same spectral space as the F420-like peak.…”

Section: Formation Of F420-like Component Resulting From Biological P...mentioning

confidence: 99%

Tracking performance and disturbance in decentralized wastewater treatment systems with fluorescence spectroscopy

Mladenov,

Sanfilippo,

Panduro

et al. 2024

Environ. Sci.: Water Res. Technol.

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Section: Formation Of F420-like Component Resulting From Biological P...mentioning

confidence: 99%

Tracking performance and disturbance in decentralized wastewater treatment systems with fluorescence spectroscopy

Mladenov,

Sanfilippo,

Panduro

et al. 2024

Environ. Sci.: Water Res. Technol.

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“…The organic matter stored inside the algae cells and released from the destroyed algae cells is called intracellular organic matter (IOM), while the organic matter released into the water environment during the growth and metabolism is called extracellular organic matter (EOM). EOM has become an important factor affecting the treatment of cyanobacteria-containing water (Sun et al, 2022). The presence of EOM results in larger and looser flocs.…”

Section: Interfering Factorsmentioning

confidence: 99%

Coagulation as an effective method for cyanobacterial bloom control: A review

Yang,

Wang,

et al. 2024

Water Environment Research

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Eutrophication, the over‐enrichment with nutrients, for example, nitrogen and phosphorus, of ponds, reservoirs and lakes, is an urgent water quality issue. The most notorious symptom of eutrophication is a massive proliferation of cyanobacteria, which cause aquatic organism death, impair ecosystem and harm human health. The method considered to be most effective to counteract eutrophication is to reduce external nutrient inputs. However, merely controlling external nutrient load is insufficient to mitigate eutrophication. Consequently, a rapid diminishing of cyanobacterial blooms is relied on in‐lake intervention, which may encompass a great variety of different approaches. Coagulation/flocculation is the most used and important water purification unit. Since cyanobacterial cells generally carry negative charges, coagulants are added to water to neutralize the negative charges on the surface of cyanobacteria, causing them to destabilize and precipitate. Most of cyanobacteria and their metabolites can be removed simultaneously. However, when cyanobacterial density is high, sticky secretions distribute outside cells because of the small size of cyanobacteria. The sticky secretions are easily to form complex colloids with coagulants, making it difficult for cyanobacteria to destabilize and resulting in unsatisfactory treatment effects of coagulation on cyanobacteria. Therefore, various coagulants and coagulation methods were developed. In this paper, the focus is on the coagulation of cyanobacteria as a promising tool to manage eutrophication. Basic principles, applications, pros and cons of chemical, physical and biological coagulation are reviewed. In addition, the application of coagulation in water treatment is discussed. It is the aim of this review article to provide a significant reference for large‐scale governance of cyanobacterial blooms.Practitioner Points Flocculation was a promising tool for controlling cyanobacteria blooms. Basic principles of four kinds of flocculation methods were elucidated. Flocculant was important in the flocculation process.

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“…The different gray values of the original SEM images obtained by SEM experime (2) were defined as yellow, green, cyan, and blue, and the gray values of some regio were extracted and converted into 3D graphics [31][32][33], such as those shown in Figure 1 The upper part of the bed settlement (Figure 16a) reveals that the size of flocs is larg most of which are over 20 μm. Moreover, the distribution is concentrated, and macropor that are 10 μm in size are found.…”

Section: Analysis Of the Spatial Morphology Of The Ultrafine Tailings...mentioning

confidence: 99%

Flocculation and Settlement Characteristics of Ultrafine Tailings and Microscopic Characteristics of Flocs

et al. 2022

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Aiming to solve the problems related to the slow settling speed and the long-term consumption of ultra-fine tailings in mine filling, the effect of flocculant type on the flocculation and settling performance of ultra-fine tailings was studied through static sedimentation experiments on tailings. The microstructure of the flocculation was observed and analyzed using an electron microscope. On this basis, the selection of the optimum flocculant type and dosage parameters was carried out. The results show that the best addition amount of the AZ9020 anionic flocculant was 30 g/t, a solution concentration of 0.3%, and a stirring time of more than 45 min. The floc structure of the full-tailings flocculation solution was formed by the AZ9020 anionic flocculant. Moreover, the size of less than 0.1 μm was still relatively large; thus, the overall size of the structure was small and uniformly dispersed. The floc solution had the smallest porosity, the fractal dimension was the largest, the molecular weight of the floc was the largest, and the floc was the most compact, making it appropriate for the rapid removal of floc structures from water. Sedimentation is also the best flocculant for flocculation and sedimentation. The size of the flocs decreased as the height of the flocculation sediment bed increased during flocculation and sedimentation. The research results provide a microscopic view for the selection of the best flocculant type.

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Analysis on the flocculation characteristics of algal organic matters

Cited by 11 publications

References 26 publications

Tracking performance and disturbance in decentralized wastewater treatment systems with fluorescence spectroscopy

Tracking performance and disturbance in decentralized wastewater treatment systems with fluorescence spectroscopy

Coagulation as an effective method for cyanobacterial bloom control: A review

Flocculation and Settlement Characteristics of Ultrafine Tailings and Microscopic Characteristics of Flocs

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