A comparison of the character of algal extracellular versus cellular organic matter produced by cyanobacterium, diatom and green alga

Pivokonský, Martin; Safarikova, Jana; Barešová, Magdalena; Pivokonská, Lenka; Kopecká, Ivana

doi:10.1016/j.watres.2013.12.022

Cited by 191 publications

(83 citation statements)

References 22 publications

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“…Compared with pure water, the content of Al a decreased, and the contents of Al b increased; the Al c content depended on the pH of the algae suspension. This phenomenon may be due to the effect of the secretion of macromolecular organic matter, such as polysaccharides and proteins, on PACl hydrolyzation during the growth of algae in the algal suspension (Pivokonsky et al 2014). The content of Al a was previously reported to reduce (Yang et al 2010).…”

Section: Aluminum Speciationmentioning

confidence: 96%

“…The organic matter produced by algae cells, including polysaccharides, pectins, lipoproteins, and polyamide acids, were discharged to the outside of cells and formed organic substances that covered the cells. These substances were generally colloidal and had negative charges, and thus, the potential of the algae solution became negative (Henderson et al 2008;Pivokonsky et al 2014). The nano-Fe 3 O 4 was electropositive under pH 6 and electronegative if pH was above 7.…”

Section: Zeta Potentialmentioning

confidence: 99%

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Removal of Microcystis aeruginosa using nano-Fe3O4 particles as a coagulant aid

Zhang

Jiang

Guo

et al. 2015

Environ Sci Pollut Res

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Blue-green algae bloom is of great concern globally since they adversely affect the water ecosystem and also drinking water treatment processes. This work investigated the removal of Microcystis aeruginosa (M. aeruginosa) by combining the conventional coagulant polyaluminum chloride (PACl) with nano-Fe3O4 particles as a coagulant aid. The results showed that the addition of nano-Fe3O4 significantly improved the removal efficiency of M. aeruginosa by reducing the amount of PACl dosage and simultaneously hastening the sedimentation. At the M. aeruginosa density of an order of magnitude of 10(7), 10(6), and 10(5) pcs/mL, respectively, the corresponding PACl dose of 200, 20, and 2 mg/L and the mass ratio of PACl to nano-Fe3O4 of 4:1, the removal efficiency of M. aeruginosa could be increased by 33.0, 44.7, and 173.1%, respectively. Compared to PACl, PACl combined with the nano-Fe3O4 as a coagulant aid had higher removal efficiency at a wider pH range. SEM images showed that nano-Fe3O4 first combined with PACl to form clusters and further generated the flocs with algae. Results from the laser particle analyzer further suggested that the floc size increased with the addition of nano-Fe3O4. It was noted that the addition of nano-Fe3O4 led to aluminum species change after PACl hydrolyzed in the algae solution, from Ala to Alb and Alc subsequently. As a coagulant aid, the nano-Fe3O4, in conjunction with PACl, apparently provided nucleation sites for larger flocs to integrate with M. aeruginosa. In addition, increased floc density improved the removal of M. aeruginosa.

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Section: Aluminum Speciationmentioning

confidence: 96%

Section: Zeta Potentialmentioning

confidence: 99%

Removal of Microcystis aeruginosa using nano-Fe3O4 particles as a coagulant aid

Zhang

Jiang

Guo

et al. 2015

Environ Sci Pollut Res

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“…79, 5.12, 5.25, 5.45, 5.62, 5.80, 6.10, 6.33, 6.47, 6.63, 7.05, 7.39, 7.82, 7.93 and 8.05. The character of COM peptides/proteins of M. aeruginosa has been discussed in our previous studies (Pivokonsky et al 2006(Pivokonsky et al , 2012(Pivokonsky et al , 2014Hnatukova et al 2011). …”

Section: Com Peptide/protein Characterizationmentioning

confidence: 98%

“…As a result of the release of COM during algal growth, there are increasing amounts of proteins in the cultivation media of several species. The peptide/ protein portion reached up to 47% of the total organics for Microcystis aeruginosa, 42% for the diatom Fragilaria crotonensis and 28% for the green alga Chlamydomonas geitleri (Pivokonsky et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Effect of cyanobacterial peptides and proteins on coagulation of kaolinite

Novotná

Barešová

Čermáková

et al. 2016

European Journal of Environmental Sciences

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Coagulation of peptides and proteins produced by the cyanobacterium Microcystis aeruginosa and their influence on the coagulation of hydrophobic kaolinite particles were investigated. For this purpose, the dose of ferric sulphate used as the coagulant was optimized and jar tests with kaolinite, peptides/proteins and both kaolinite and peptides/proteins were carried out under different pH conditions. At pH 4-5.5, the peptides/proteins were efficiently coagulated and peptides/proteins were also found to contribute to the coagulation of kaolinite particles at this pH. Charge neutralization and adsorption were found to be the dominant coagulation mechanisms. The coagulation efficiency and the character of the prevailing coagulation mechanism were strongly dependent on the charge characteristics of the peptides/proteins, kaolinite and hydrolysis products of iron, thus on the pH value. At a pH of about 6, the coagulation process deteriorated due to the formation of soluble Fe-peptide/protein complexes.

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“…This indicates that algae produce mainly BP and BB during their exponential growth period. Increase in LMW acids and neutrals during stationary/death phase (day 28) might be an indication of cell death/lysis and release of IOM, cell fragments and other debris [39,40]. The relative concentration of BP to overall DOC was plotted over time for the three species (Fig.…”

Section: Overall Aom Productionmentioning

confidence: 99%

Advanced characterization of dissolved organic matter released by bloom-forming marine algae

Rehman¹,

Jeong²,

Tabatabai³

et al. 2017

Desalination and Water Treatment

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a b s t r a c tAlgal organic matter (AOM), produced by marine phytoplankton during bloom periods, may adversely affect the performance of membrane processes in seawater desalination. The polysaccharide fraction of AOM has been related to (bio)fouling in micro-filtration and ultrafiltration, and reverse osmosis membranes. However, so far, the chemical structure of the polysaccharides released by bloom-forming algae is not well understood. In this study, dissolved fraction of AOM produced by three algal species (Chaetoceros affinis, Nitzschia epithemoides and Hymenomonas spp.) was characterized using liquid chromatography-organic carbon detection (LC-OCD) and fluorescence spectroscopy. Chemical structure of polysaccharides isolated from the AOM solutions at stationary phase was analyzed using proton nuclear magnetic resonance ( 1 H-NMR). The results showed that production and composition of dissolved AOM varied depending on algal species and their growth stage. AOM was mainly composed of biopolymers (BP; i.e., polysaccharides and proteins [PN]), but some refractory substances were also present. 1 H-NMR spectra confirmed the predominance of carbohydrates in all samples. Furthermore, similar fingerprints were observed for polysaccharides of two diatom species, which differed considerably from that of coccolithophores. Based on the findings of this study, 1 H-NMR could be used as a method for analyzing chemical profiles of algal polysaccharides to enhance the understanding of their impact on membrane fouling.

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A comparison of the character of algal extracellular versus cellular organic matter produced by cyanobacterium, diatom and green alga

Cited by 191 publications

References 22 publications

Removal of Microcystis aeruginosa using nano-Fe3O4 particles as a coagulant aid

Removal of Microcystis aeruginosa using nano-Fe3O4 particles as a coagulant aid

Effect of cyanobacterial peptides and proteins on coagulation of kaolinite

Advanced characterization of dissolved organic matter released by bloom-forming marine algae

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