Effective harvesting of microalgae: Comparison of different polymeric flocculants

Gerchman, Yoram; Vasker, Barak; Tavasi, Mordechai; Mishael, Yael G.; Kinel-Tahan, Yael; Yehoshua, Yaron

doi:10.1016/j.biortech.2016.12.040

Cited by 90 publications

(25 citation statements)

References 17 publications

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“…However, the turbidity removal rate obtained by CPAM and PFS increased with an increasing pH at pH values of <8. When pH was >8, the turbidity removal rate that was obtained by CPAM and PFS decreased [41]. So, at pH = 8, the turbidity removal rate of CPAM and PFS reached the maximum values of 46.91% and 42.15%, respectively.…”

Section: Effect Of Ph On Flocculation Propertiesmentioning

confidence: 90%

Synthesis and Characterization of Ampholytic Flocculant CPCTS-g-P (CTA-DMDAAC) and Its Flocculation Properties for Microcystis Aeruginosa Removal

et al. 2018

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Abstract:The ampholytic chitosan based flocculant carboxylated chitosan graft-(3-chloro-2-hydroxypropyl) trimethylammonium chloride-dimethyl diallyl ammonium chloride (CPCTS-g-P (CTA-DMDAAC)) was synthesized by photo polymerization using carboxylated chitosan (CPCTS), 3-chloro-2-chloropropyltrimethylammonium chloride (CTA) and dimethyldiallylammonium chloride (DMDAAC) as the cationic co-monomers. The effects of monomer concentration, the ratio of CPCTS and cationic monomers, cationic degree, initiator time, photoinitiator concentration, and pH value on the properties of CPCTS-g-P (CTA-DMDAAC) were studied. The microcystis aeruginosa that was cultured in laboratory was used for CPCTS-g-P (CTA-DMDAAC) flocculation tests. The effects of CPCTS-g-P (CTA-DMDAAC) dosage, pH value and G value on flocculation performance were investigated. The maximum removal rate of chlorophyll-a (Chl-a) and chemical oxygen demand (COD) that were obtained by CPCTS-g-P (CTA-DMDAAC) were 98.8% and 96.5% under the conditions of dosage 4 mg/L, pH 7 and G value 200 s −1 , respectively. The flocculation experiments showed that chitosan-based flocculant CPCTS-g-P (CTA-DMDAAC) had better flocculation performance than commercially available flocculants cationic polyacrylamide (CPAM), Polyferric Sulfate (PFS), and polymeric aluminium (PAC).

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Section: Effect Of Ph On Flocculation Propertiesmentioning

confidence: 90%

Synthesis and Characterization of Ampholytic Flocculant CPCTS-g-P (CTA-DMDAAC) and Its Flocculation Properties for Microcystis Aeruginosa Removal

et al. 2018

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“…The alkaline environment was established by adding NaOH in this study. A previous study reported that using polydiallyldimethylammonium chloride (PDADMAC) for marine microalga Nannochloropsis salina at an alkaline pH of 10 resulted in a decrease of efficiency, since a high dosage was required because of the adsorption of salt anions on the polymer or algae [35].…”

Section: Effects Of Dosage Concentration On Magnetic Harvestingmentioning

confidence: 99%

Magnetophoretic Harvesting of Nannochloropsis oculata Using Iron Oxide Immobilized Beads

Chu

Wan

Chen

et al. 2020

Water

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In this work, the harvesting of Nannochloropsis oculata microalgae through the use of nanosized Fe3O4 immobilized in polyvinyl alcohol (PVA)/sodium alginate (SA) as a flocculant (Fe3O4/PS) is investigated. Using the Fe3O4/PS immobilized beads could reduce the amount of soluble ferrous ions (Fe2+) released from naked Fe3O4 in acid treatment, leading to easy recovery. The characterization was performed under different dosages and pH values of Fe3O4/PS. The results show that the Fe3O4/PS, when applied to the algae culture (500 mg dry cell weight/L), achieves a 96% harvesting efficiency under conditions of a pH of 4 with 200 mT magnetic field intensity. Fe3O4/PS can be directly reused without adjusting the pH value. The recycled Fe3O4/PS shows stability in terms of its surface properties, maintaining more than 80% harvesting efficiency after five recycles. Magnetophoretic harvesting, using immobilized magnetic iron oxide as a particle-based flocculant, is a potential method to reduce challenges related to the cost-effective microalgae-harvesting method.

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“…Regarding this, the authors stated that CS has approved to be efficient, concerning the coagulation of suspended matter in wastewater even at low temperatures and low doses [28]. cies depending on the pH and dosage but approved that CS can be successfully applied to harvest microalgae [29]. Hence, the application of CS to induce biofloc formation with microorganisms for clarification purposes or reducing harmful nutrient contents would be suitable.…”

Section: Chitosan As Coagulating and Flocculating Agentmentioning

confidence: 99%

Sewage Polluted Water Treatment via Chitosan: A Review

Hahn¹,

Zibek²

2018

Chitin-Chitosan - Myriad Functionalities in Science and Technology

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Due to the increasing scarcity of water, wastewater treatment and water conditioning are one of the major future issues. Together with the need to apply highly accessible abundant materials and the demand to replace fossil-based chemicals with sustainable compounds from renewable resources, chitosan (CS) provides some of the solutions to obtain these goals and combines both, abundance and sustainability. Hence, the focus of this review is on the application of CS in wastewater treatment providing advantages and drawbacks in using CS in contrast to chitin. We herewith present the application of CS for coagulation/flocculation purposes, whether as native compound, as functionalized molecule or as blend, respectively, composite. The heavy metal, respectively, dye removal is an additional theme to be addressed in the body of the text. The third topic of this review contains the application of CS blends or composites in order to prepare membrane materials for water purification or conditioning. Together with a summary of the recent study, we discuss these findings and possible consequences for future works. In addition, we provide some theoretical background of the processes that CS is involved in and state some mechanistic insights.

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Effective harvesting of microalgae: Comparison of different polymeric flocculants

Cited by 90 publications

References 17 publications

Synthesis and Characterization of Ampholytic Flocculant CPCTS-g-P (CTA-DMDAAC) and Its Flocculation Properties for Microcystis Aeruginosa Removal

Synthesis and Characterization of Ampholytic Flocculant CPCTS-g-P (CTA-DMDAAC) and Its Flocculation Properties for Microcystis Aeruginosa Removal

Magnetophoretic Harvesting of Nannochloropsis oculata Using Iron Oxide Immobilized Beads

Sewage Polluted Water Treatment via Chitosan: A Review

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