Investigating microalgae cell-microsphere interactions during microalgae harvesting by ballasted dissolved air flotation through XDLVO theory

Xu, Kaiwei; Li, Yanpeng; Zou, Xin; Wen, Hao; Shen, Zhou; Ren, Xiangying

doi:10.1016/j.bej.2018.06.013

Cited by 44 publications

(9 citation statements)

References 34 publications

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“…After the maxima, harvesting efficiency declined gradually with increasing pH. These results were consistent with the findings of Xu et al, 44 who reported that low-pH conditions have a positive effect on harvesting efficiency. However, as the pH value reduced further to 2, air flotation efficiency decreased, showing the optimal pH value for air flotation with thermal pretreatment to be 3.…”

Section: Influence Of Phsupporting

confidence: 92%

Optimization of thermal pre‐flocculation treatment for effective air flotation harvesting of microalgae

Xue

Zou

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND The production of microalgal biomass as a potential biofuel source is limited by expensive harvesting costs. However, air flotation has been applied as an effective method for harvesting microalgal cells from diluted liquid suspensions. In this study, Chlorella vulgaris and Scenedesmus obliquus harvesting experiments were performed with thermal pretreatment prior to air flotation. RESULTS An orthogonal test showed that the harvesting efficiency was affected by the heating temperature and pH but not by the microalgal concentration or stirring rate. Under a heating temperature of 90 °C and pH 3, the optimal heat‐aided air flotation efficiency achieved for harvesting C. vulgaris was 26.5%, with a concentration factor of 5.5. For harvesting S. obliquus, the optimal harvesting efficiency was 93.6% and the concentration factor was 25.0 under a heating temperature of 70 °C and pH 3. CONCLUSION High temperature and low pH increased the zeta potential value of the microalgal cell surface, and high temperature promoted the secretion of extracellular organic matter, causing microalgal cells to gather and form flocs. The smaller flocs and higher zeta potential value of S. obliquus led to its higher harvesting efficiency. These conditions provided the possibility of waste acidic gas and thermal energy from industries replacing flocculants for the harvesting process. © 2019 Society of Chemical Industry

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Section: Influence Of Phsupporting

confidence: 92%

Optimization of thermal pre‐flocculation treatment for effective air flotation harvesting of microalgae

Xue

Zou

et al. 2019

J of Chemical Tech & Biotech

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“…Some modifications of the flotation method stand out as innovations in improving biomass concentration, such as microflotation, in which microbubbles (50 µm) are generated through fluidic oscillation in a dispersed air flotation column [21]. Ballasted flotation is also an example in which microspheres of sodium borosilicate glass are used to aggregate microalgae cells [22]. The main obstacles in this method are related to the scale-up.…”

Section: Flotationmentioning

confidence: 99%

A comparative analysis of algal biomass densification methods aimed at the biofuel production

Santos¹,

Bassin²,

Cammarota³

2023

World J. Adv. Eng. Technol. Sci.

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The reduced size of the cells (< 30 µm in diameter) and the low cell concentration of microalgae and cyanobacteria cultures (0.5 g/L on average) greatly hinder the densification of the biomass, a crucial step to becoming biofuel production from algal biomass economically viable. To identify the best densification method, about 90 studies applied to 60 different microalgae and cyanobacteria were compiled through an extensive literature survey, classified into eight methods of algal biomass densification, and analyzed regarding the harvesting efficiency, energy consumption, and costs. Low-cost methods (spontaneous settling, autoflocculation, and bioflocculation) can achieve high densification only with specific species and conditions. On the contrary, many species only achieve high densification using high-cost methods (centrifugation, membrane filtration, electrocoagulation). Based on the analyzed data, researchers should focus on selecting species that combine the desired characteristics for the downstream processes with their potential for biofuel production.

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“…These electrokinetic results are further considered to establish predictions of microalgae interactions on the basis of standard DLVO theory. 7,27,28…”

Section: Introductionmentioning

confidence: 99%

Physicochemical surface properties of Chlorella vulgaris: a multiscale assessment, from electrokinetic and proton uptake descriptors to intermolecular adhesion forces

Lesniewska,

Duval,

Caillet

et al. 2024

Nanoscale

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Investigating microalgae cell-microsphere interactions during microalgae harvesting by ballasted dissolved air flotation through XDLVO theory

Cited by 44 publications

References 34 publications

Optimization of thermal pre‐flocculation treatment for effective air flotation harvesting of microalgae

Optimization of thermal pre‐flocculation treatment for effective air flotation harvesting of microalgae

A comparative analysis of algal biomass densification methods aimed at the biofuel production

Physicochemical surface properties of Chlorella vulgaris: a multiscale assessment, from electrokinetic and proton uptake descriptors to intermolecular adhesion forces

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