A cost-effective strategy for marine microalgae separation by electro-coagulation–flotation process aimed at bio-crude oil production: Optimization and evaluation study

Golzary, Abooali; Imanian, Sajad; Abdoli, Mohammad Ali; Khodadadi, Abbas Ali; Karbassi, Abdolreza

doi:10.1016/j.seppur.2015.04.011

Cited by 43 publications

(11 citation statements)

References 44 publications

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“…This process is a labor-intensive and timeintensive step, which separates the microalgal biomass from water for effective downstream processing [4]. Algae concentration and separation from the exhausted media demands large amounts of energy [5]; therefore, extended operation times are required to concentrate significant amounts of biomass.…”

Section: Introductionmentioning

confidence: 99%

An Innovative Low-Cost Equipment for Electro-Concentration of Microalgal Biomass

Sanchez-Galvis¹,

Cardenas-Gutierrez²,

Contreras-Ropero³

et al. 2020

Preprint

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Microalgal harvesting is one of the most challenging processes in the development of algal research and development. Several methods, such as centrifugation, flocculation, and filtration, are available at the laboratory scale. However, the requirement of expensive pieces of equipment and the possibility of biomass contamination are recurring gaps that hinder the development of microalgae I+D in different parts of the world. Recently, the electroflotation has been proved as a suitable method for the harvesting of different species of microalgae and cyanobacteria. To this day, there are no companies that sell laboratory-scale electroflotation equipment; this is mainly due to the gap in the knowledge on which factors (time, mixing rate, number of electrodes, and others) will affect the efficiency of concentration without reducing the biomass quality. This paper aims to build an innovative low-cost electroflotation system under 300 USD with cheap and resistant materials. To achieve our goal, we test the interaction of three variables (time, mixing rate, and amount of electrodes) were evaluated. Results showed that an efficiency closer to 100% could be achieved under 20 minutes using >10 electrodes and 150 rpm. We hope this innovative approach can be used by different researchers to improve our knowledge of the concentration and harvesting of algae and cyanobacteria.

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Section: Introductionmentioning

confidence: 99%

An Innovative Low-Cost Equipment for Electro-Concentration of Microalgal Biomass

Sanchez-Galvis¹,

Cardenas-Gutierrez²,

Contreras-Ropero³

et al. 2020

Preprint

View full text Add to dashboard Cite

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“…Therefore, microalgae have been widely cultivated and harvested for their advantages. Taking the variation in green algae size (3–30 μm in diameter) and the low concentration (0.5–2 g L −1 ) of algae into consideration, several technologies for microalgae–water separation have been developed, such as centrifugation, coagulation–sedimentation, coagulation–flotation, and filtration . The technology choice is filtration‐based membrane harvesting because of its potential to achieve a cost‐effective and environmentally sustainable microalgal downstream process.…”

Section: Introductionmentioning

confidence: 99%

“…Taking the variation in green algae size (3-30 μm in diameter) and the low concentration (0.5-2 g L −1 ) of algae into consideration, several technologies for microalgae-water separation have been developed, such as centrifugation, coagulation-sedimentation, coagulation-flotation, and filtration. [8][9][10][11][12] The technology choice is filtration-based membrane harvesting because of its potential to achieve a cost-effective and environmentally sustainable microalgal downstream process. This is due to the nature of physical separation by size exclusion, which does not result in the impurity of biomass or contamination of separated culture media.…”

Section: Introductionmentioning

confidence: 99%

Improving antifouling performance for the harvesting of Scenedesmus acuminatus using Fe₂O₃ nanoparticles incorporated PVC nanocomposite membranes

Liu

Demirel

Chen

et al. 2019

J of Applied Polymer Sci

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Membrane filtration provided a potential solution to get high quality microalgae biomass and recyclable medium. However, the fouling of membrane by microalgae cells and organic matter greatly affects membrane harvesting efficiency. In this study, membrane performance was tested in terms of flux declining and backwashing recovery for microalgal harvesting. Compared with the unmodified poly(vinyl chloride) (PVC) membrane, the membrane with 1.0% Fe2O3 incorporation had a 66% increase in average flux, reaching 138 L m− h−1. Foulants on the membrane surface were characterized using attenuated total reflection‐Fourier transform infrared (ATR‐FTIR) and confocal laser scanning microscope (CLSM), as well as sodium hydroxide extraction followed by total organic carbon (TOC) quantification and fluorescence excitation–emission matrix (FEEM) identification of organic components. FEEM and TOC analysis of the extracted foulants revealed that the surface of 1.0% Fe2O3 incorporated membrane had less fouling than the unmodified PVC membrane, which may be attributed to its hydrophilicity after Fe2O3 incorporation. CLSM analysis and ATR‐FTIR analysis of the fouled membrane surface further revealed that the protein substance on the 1.0% Fe2O3 incorporated PVC membrane was lower than those in the unmodified membrane, which further confirmed the enhanced antifouling performance of the 1.0% Fe2O3 incorporated PVC membrane. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47685.

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“…Different studies showed that high costs were derived from the harvesting process 3. In this way, different methodologies of harvesting can be used to aggregate microalgal biomass, such as flocculation, autoflocculation, gravity sedimentation, flotation, filtration, centrifugation, or electro‐coagulation processes 4–6.…”

Section: Introductionmentioning

confidence: 99%

“…This phenomenon occurs due to different densities of the existing medium and different particle sizes 8. Electrocoagulation is a simple technology that involves the application a small amount of electricity between two metal electrodes, usually made of iron or aluminum 5. Thus, floc formation takes place because of algal cells on the surface are neutralized at the anode electrode 10.…”

Section: Introductionmentioning

confidence: 99%

Influence of a Combination of Flocculants on Harvesting of Chaetoceros gracilis Marine Microalgae

et al. 2016

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Harvesting is one of the most important operations in microalgal biomass utilization. Two types of flocculants are widely used in flocculation. Inorganic flocculants are usually cheaper than organic flocculants, but leave more contaminants on the culture media. The combination of one inorganic and one organic flocculant and its synergy for the marine microalgae Chaetoceros gracilis harvesting process is reported. The efficiency of eight inorganic and five organic flocculants was studied. The results show that, when only FeCl3 was used, high doses were required for high levels of biomass recovery, whereas chitosan alone led to poor recoveries. However, when both flocculants were used in combined flocculation, total biomass recovery was achieved, even at low doses.

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A cost-effective strategy for marine microalgae separation by electro-coagulation–flotation process aimed at bio-crude oil production: Optimization and evaluation study

Cited by 43 publications

References 44 publications

An Innovative Low-Cost Equipment for Electro-Concentration of Microalgal Biomass

An Innovative Low-Cost Equipment for Electro-Concentration of Microalgal Biomass

Improving antifouling performance for the harvesting of Scenedesmus acuminatus using Fe₂O₃ nanoparticles incorporated PVC nanocomposite membranes

Influence of a Combination of Flocculants on Harvesting of Chaetoceros gracilis Marine Microalgae

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A cost-effective strategy for marine microalgae separation by electro-coagulation–flotation process aimed at bio-crude oil production: Optimization and evaluation study

Cited by 43 publications

References 44 publications

An Innovative Low-Cost Equipment for Electro-Concentration of Microalgal Biomass

An Innovative Low-Cost Equipment for Electro-Concentration of Microalgal Biomass

Improving antifouling performance for the harvesting of Scenedesmus acuminatus using Fe2O3 nanoparticles incorporated PVC nanocomposite membranes

Influence of a Combination of Flocculants on Harvesting of Chaetoceros gracilis Marine Microalgae

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Improving antifouling performance for the harvesting of Scenedesmus acuminatus using Fe₂O₃ nanoparticles incorporated PVC nanocomposite membranes