Email Adddress: [email protected]

dissolved air flotation microalgae harvesting

dissolved air flotation microalgae harvesting

Flotation harvesting of microalgae - ScienceDirect

2016-5-1  Dissolved air flotation (DAF) In dissolved air flotation (DAF) a portion of the water that has been through separation is recycled and pressurized . This recycle ratio governs the amount of bubbles in the operation and is typically 5–15% and is pressurized in the range of 400–650 kPa . When the saturated water depressurizes back to atmospheric pressure, it releases excess air, due to the new

Get Price

Coagulation and dissolved air flotation as a harvesting ...

2019-12-1  Dissolved air flotation (DAF) is a traditional type of flotation and has been reported as an efficient microalgae harvesting method [, , , ]. DAF is a method based on the air micro-bubble generation to promote the rise of microalgae flocs to the system´s

Get Price

Harvesting Microalgae Biomass by Instant Dissolved

A instant air dissolution flotation method was used to harvest microalgal cells from culture to evaluate its feasibility. Effects of microalgae cell density, coagulant dosage, flocculant dosage, surfactant dosage and duration of air dissolution on recovery rate were studied by orthogonal experiment.

Get Price

Coagulation and dissolved air flotation as a harvesting ...

Microalgae harvesting is the major bottleneck for biomass production on a large-scale. In this study, coagulation followed by dissolved air flotation (DAF) was used as a harvesting method for Chlorella sorokiniana cultivated in wastewater. The harvesting performance was evaluated using four coagulants (aluminum sulphate, ferric chloride, Tanfloc SG and Zetag 8185) usually used in water or wastewater

Get Price

Optimization of dissolved air flotation technique in ...

2015-2-18  Harvesting is a crucial step in biofuel production from microalgae. The expense of harvesting operation is estimated to be 20%–30% of the total biofuels

Get Price

Designing a cost effective microalgae harvesting strategy ...

2020-10-13  Designing a cost effective microalgae harvesting strategy for biodiesel production with electrocoagulation and dissolved air flotation Adam James Dassey Louisiana State University and Agricultural and Mechanical College Follow this and additional works at:https://digitalcommons.lsu.edu/gradschool_dissertations

Get Price

Investigating microalgae cell-microsphere interactions ...

2018-9-15  Based on the ballast concept, a ballasted dissolved air flotation (BDAF) method was developed more recently to harvest microalgae using buoyant microspheres instead of air bubbles . The underlying working principle of the BDAF method is quite straightforward (see Fig. S1).

Get Price

Harvesting of microalgae: Overview of process

2017-1-1  Microalgae harvesting is a major challenge because microalgal cells are small and carry a negative surface charge and biomass concentration in cultures is relatively low. The microalgal biomass (0.05%, w/w) needs to be concentrated to a paste with 15%–25% water content.

Get Price

Harvesting microalgal biomass using magnesium

2016-10-1  Mg 2+ coagulation-dissolved air flotation was developed for the harvesting of different microalgal strains. Mg 2+ coagulation was found more efficient than Fe 3+ , Al 3+ and chitosan. Biomass/medium contamination could be avoid as Mg 2+ is intrinsic in culture medium.

Get Price

SURFACTANT-AIDED DISPERSED AIR FLOTATION AS A

2019-11-29  Table 6.2. Dispersed air flotation aided foam fractionation variables and levels. .....215 Table 6.3. Box-Behnken design matrix for harvesting microalgae with recovery (R) and enrichment ratio (ER) from experiments. .....217 Table 6.4. Reduced model

Get Price

Harvesting of microalgae using flocculation combined

This study explored efficient methods of harvesting the Tetraselmis sp. KCTC12236BP using flocculation and dissolved air flotation. Concentration ranges of flocculation agents were optimized using jar tests (batch flocculation experiments) using inorganic (aluminum sulfate, ferric sulfate) and organic (chitosan) flocculants in a pH range of 4 - 10.

Get Price

Harvesting Microalgae Biomass by Instant Dissolved

A instant air dissolution flotation method was used to harvest microalgal cells from culture to evaluate its feasibility. Effects of microalgae cell density, coagulant dosage, flocculant dosage, surfactant dosage and duration of air dissolution on recovery rate were studied by orthogonal experiment. The results show that the optimal recovery rate reaches 89.57% under one of the test ...

Get Price

Efficient microalgae harvesting using a thermal

2019-8-1  Flotation can be generally divided into dissolved air flotation (DAF), dispersed air flotation (DiAF), and electro flotation (EF) (Ndikubwimana et al. 2016). Foam flotation, a type of DiAF, shows great potential as a microalgal biomass harvesting and enrichment method (Alkarawi et al. 2018).

Get Price

Flotation: A promising microalgae harvesting and ...

Dispersed air flotation was found to be less energy consuming. Moreover, Jameson cell flotation and dispersed ozone flotation are believed to be energy efficient microalgae flotation approaches. Microalgae harvesting and dewatering by flotation is still at embryonic stage, therefore extended studies with the focus on life cycle assessment ...

Get Price

Harvesting microalgae by CTAB-aided foam flotation ...

2017-1-1  microalgae for biofuel production [2,5,6,17e19]. Flotation, particularly dissolved air flotation, is the favoured technique foralgae removal [5,16,20,21].Duringdissolvedairflotationan inorganic flocculent such as alum is added to aggregate the cells. Small bubbles formed by supersaturation of

Get Price

SURFACTANT-AIDED DISPERSED AIR FLOTATION AS A

2019-11-29  Table 6.2. Dispersed air flotation aided foam fractionation variables and levels. .....215 Table 6.3. Box-Behnken design matrix for harvesting microalgae with recovery (R) and enrichment ratio (ER) from experiments. .....217 Table 6.4. Reduced model

Get Price

A review on microalgae cultivation and harvesting,

2020-12-1  Dispersed air flotation on the other hand uses a sparger to generate air bubble which in turn have lower energy demand when compared to dissolved air flotation . The third method is electro-flotation, which applies electrolysis operation to generate microbubbles from its electrode to trap free floating microalgae [ 70 ].

Get Price

[PDF] Critical evaluation and modeling of algal

In this study, Chlorella zofingiensis harvesting by dissolved air flotation (DAF) was critically evaluated with regard to algal concentration, culture conditions, type and dosage of coagulants, and recycle ratio. Harvesting efficiency increased with coagulant dosage and leveled off at 81%, 86%, 91%, and 87% when chitosan, Al3+, Fe3+, and cetyl trimethylammonium bromide (CTAB) were used at ...

Get Price

李彦鹏 - 长安大学 - 水利与环境学院

Investigating microalgae cell-microsphere interactions during microalgae harvesting by ballasted dissolved air flotation through XDLVO theory. Biochemical Engineering Journal, 2018, 137(9): 294-304. (SCI,中科院二区) Kaiwei Xu, Xiaotong Zou, Hao Wen, Yating Xue, Shuangfeng Zhao, Yanpeng Li*.

Get Price

Microalgae harvesting by flotation using natural saponin ...

2017-8-13  Flotation Harvesting Microalgae Saponin abstract This study aims to investigate the harvesting of microalgae by dispersed air flotation (DiAF) using natural biosurfactant saponin as the collector and chitosan as the flocculant. Two types of microalgae, Chlorella vulgaris and Scenedesmus obliquus, were used in this study.

Get Price

Harvesting microalgae by CTAB-aided foam flotation ...

2017-1-1  microalgae for biofuel production [2,5,6,17e19]. Flotation, particularly dissolved air flotation, is the favoured technique foralgae removal [5,16,20,21].Duringdissolvedairflotationan inorganic flocculent such as alum is added to aggregate the cells. Small bubbles formed by supersaturation of

Get Price

Efficient microalgae harvesting using a thermal

2019-8-1  Flotation can be generally divided into dissolved air flotation (DAF), dispersed air flotation (DiAF), and electro flotation (EF) (Ndikubwimana et al. 2016). Foam flotation, a type of DiAF, shows great potential as a microalgal biomass harvesting and enrichment method (Alkarawi et al. 2018).

Get Price

A Comprehensive Overview on Various Method of

2014-11-26  Harvesting microalgae is one of the most challenging tasks. Harvesting of algae from water or other liquids is currently a ... Dissolved air flotation (DAF) is a process where small bubbles are generated, with a mean size of 40 μm and ranging from 10 to 100 μm [12]. Dissolved air flotation

Get Price

Development of a harvesting technique for large-scale ...

2017-1-23  Dissolved air flotation also showed a flocculation efficiency of same magnitude after 7 h, but with 10 mg L −1 of alum. Thus electro-flotation required a profoundly higher voltage with increasing culture volume, whereas for dissolved air flotation

Get Price

A review on microalgae cultivation and harvesting,

2020-12-1  Dispersed air flotation on the other hand uses a sparger to generate air bubble which in turn have lower energy demand when compared to dissolved air flotation . The third method is electro-flotation, which applies electrolysis operation to generate microbubbles from its electrode to trap free floating microalgae [ 70 ].

Get Price

SURFACTANT-AIDED DISPERSED AIR FLOTATION AS A

2019-11-29  Table 6.2. Dispersed air flotation aided foam fractionation variables and levels. .....215 Table 6.3. Box-Behnken design matrix for harvesting microalgae with recovery (R) and enrichment ratio (ER) from experiments. .....217 Table 6.4. Reduced model

Get Price

[PDF] Critical evaluation and modeling of algal

In this study, Chlorella zofingiensis harvesting by dissolved air flotation (DAF) was critically evaluated with regard to algal concentration, culture conditions, type and dosage of coagulants, and recycle ratio. Harvesting efficiency increased with coagulant dosage and leveled off at 81%, 86%, 91%, and 87% when chitosan, Al3+, Fe3+, and cetyl trimethylammonium bromide (CTAB) were used at ...

Get Price

CRANFIELD UNIVERSITY Francesco Ometto MICROALGAE

2017-12-18  conventional Dissolved Air Flotation (DAF). BDAF was demonstrably a very viable harvesting method where the use of floating microspheres as ballasting agents allowed significant coagulant savings, reduced the level of energy dissipation within the flotation

Get Price

李彦鹏 - 长安大学 - 水利与环境学院

Investigating microalgae cell-microsphere interactions during microalgae harvesting by ballasted dissolved air flotation through XDLVO theory. Biochemical Engineering Journal, 2018, 137(9): 294-304. (SCI,中科院二区) Kaiwei Xu, Xiaotong Zou, Hao Wen, Yating Xue, Shuangfeng Zhao, Yanpeng Li*.

Get Price

Comparison of flotation techniques to harvest

Dissolved and dispersed air flotation and foam fractionation will be employed and evaluated by harvesting efficiency, concentration factor and bubble size. Flotation will be compared to sedimentation and a cost analysis will compare the economic viability of

Get Price

Optimization of dissolved air flotation technique in

Harvesting is a crucial step in biofuel production from microalgae. The expense of harvesting operation is estimated to be 20%–30% of the total biofuels production cost. Dissolved air flotation (DAF) is a well known technology for separating solid particles from liquid ...

Get Price

"Designing a cost effective microalgae harvesting

Furthermore, a continuous multistage algae harvester using EC and dissolved air flotation (DAF) for Stage 1 harvesting and centrifugation for Stage 2 dewatering was designed. It was determined throughout the testing that greater EC costs for improved harvesting efficiencies were necessary to offset the large energy requirements of the DAF.

Get Price

A Comprehensive Overview on Various Method of

2014-11-26  Harvesting microalgae is one of the most challenging tasks. Harvesting of algae from water or other liquids is currently a ... Dissolved air flotation (DAF) is a process where small bubbles are generated, with a mean size of 40 μm and ranging from 10 to 100 μm [12]. Dissolved air flotation

Get Price

Flotation: A promising microalgae harvesting and ...

2016-3-1  Dispersed air flotation was found to be less energy consuming. Moreover, Jameson cell flotation and dispersed ozone flotation are believed to be energy efficient microalgae flotation approaches. Microalgae harvesting and dewatering by flotation is still at embryonic stage, therefore extended studies with the focus on life cycle assessment ...

Get Price

A review on microalgae cultivation and harvesting,

2020-12-1  Dispersed air flotation on the other hand uses a sparger to generate air bubble which in turn have lower energy demand when compared to dissolved air flotation . The third method is electro-flotation, which applies electrolysis operation to generate microbubbles from its electrode to trap free floating microalgae [ 70 ].

Get Price

SURFACTANT-AIDED DISPERSED AIR FLOTATION AS A

2019-11-29  Table 6.2. Dispersed air flotation aided foam fractionation variables and levels. .....215 Table 6.3. Box-Behnken design matrix for harvesting microalgae with recovery (R) and enrichment ratio (ER) from experiments. .....217 Table 6.4. Reduced model

Get Price

The Impacts of Replacing Air Bubbles with Microspheres

2018-1-25  16 Dissolved Air Flotation (DAF) is a well-known coagulation-flotation system applied at large 17 scale for microalgae harvesting. Compared to conventional harvesting technologies DAF allows18 high cell recovery at lower energy demand. By replacing microbubbles with

Get Price

[PDF] Critical evaluation and modeling of algal

In this study, Chlorella zofingiensis harvesting by dissolved air flotation (DAF) was critically evaluated with regard to algal concentration, culture conditions, type and dosage of coagulants, and recycle ratio. Harvesting efficiency increased with coagulant dosage and leveled off at 81%, 86%, 91%, and 87% when chitosan, Al3+, Fe3+, and cetyl trimethylammonium bromide (CTAB) were used at ...

Get Price

Microalgae harvesting by magnetic flocculation for ...

2020-7-7  In the flotation method, tiny bubbles are attached to the surface of microalgae, which reduces the cell density of microalgae and floats to the surface of liquid, thus realizing solid–liquid separation. This method includes dissolved air flotation, dispersed air flotation, electrolytic flotation, Jameson cell and dispersed ozone flotation.

Get Price