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Bioflocculation: An alternative strategy for harvesting of ...
Auto-flocculation is the flocculation that can occur naturally in certain microalgae and microalgae may flocculate in response to some environmental stress, changes in nitrogen, pH, dissolved oxygen and amount of calcium and magnesium ions in the culture mediums (Uduman et al., 2010; Schenk et al., 2008).
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[PDF] Critical evaluation and modeling of algal harvesting ...
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 ...
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WO2011040955A1 - Method and system for efficient ...
Further water can be removed from the floe by sedimentation, low speed centrifugation, dissolved air flotation or filtration, prior to further processing to separate oil from valuable co-products. The high-speed centrifugation heretofore required for harvesting micro algae and cyanobacteria cultured for biofuels and other co-products is a major ...
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Flotation of algae for water reuse and biomass production ...
In addition, microalgae separation characteristics which are associated with surfactants demonstrated optimal microalgae cultivation time and separation efficiency of dissolved CO2 flotation (DCF) as an alternative to dissolved air flotation (DAF). Microalgae were significantly separated in response to anionic surfactant rather than cationic ...
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Harvesting microalgal biomass using magnesium coagulation ...
Coagulation with magnesium was found to be more effective for harvesting microalgae Chlorella zofingiensis with dissolved air flotation (DAF) than the use of Fe 3+, Al 3+ or chitosan, and the required coagulant dosage was in the order Mg 2+ < chitosan < Al 3+ < Fe 3+.The Mg 2+ dosage required depended on the growth phases and culture medium characteristics.
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Harvesting of microalgae using flocculation combined with ...
Dissolved air flotation (DAF) is a traditional type of flotation and has been reported as an efficient microalgae harvesting method [7] [8][9][10]. DAF is a method based on the air micro-bubble ...
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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 ...
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Harvesting microalgae using ozone-air flotation for ...
Combined system for wastewater treatment: ozonization and coagulation via tannin-based agent for harvesting microalgae by dissolved air flotation. Oliveira GA, Machado ÊL, Knoll RS, Dell'Osbel N, Colares GS, Rodrigues LR. Environ Technol, 1-11, 06 Oct 2020 Cited by: 0 articles | …
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Optimization of dissolved air flotation technique in ...
Request PDF | Optimization of dissolved air flotation technique in harvesting microalgae from treated wastewater without flocculants addition | Harvesting is a crucial step in biofuel production ...
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Harvesting marine microalgae Nannochloropsis sp. using ...
Nurafifah Fuad, and Rozita Omar, and Suryani Kamarudin, and Razif Harun, and A. Idris, and Wan Azlina W.A.K.G, (2021) Harvesting marine microalgae Nannochloropsis sp. using Dissolved Air Flotation (DAF) technique. Sains Malaysiana, 50 (1). pp. 73-83. ISSN 0126-6039
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US20110081706A1 - Method and system for efficient ...
Further water can be removed from the floc by sedimentation, low speed centrifugation, dissolved air flotation or filtration, prior to further processing to separate oil from valuable co-products. The high-speed centrifugation heretofore required for harvesting micro algae and cyanobacteria cultured for biofuels and other co-products is a major ...
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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,） Kaiwei Xu, Xiaotong Zou, Hao Wen, Yating Xue, Shuangfeng Zhao, Yanpeng Li*.
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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 …
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Effective harvesting of microalgae by coagulation ...
This study developed a coagulation–flotation process for microalgae Chlorella sp. XJ-445 harvesting, which was composed of algal surface modification by combined use of Al 3+ and cetyltrimethylammonium bromide (CTAB) and followed dispersed bubble flotation. Dissolved organic matter (DOM) in the medium was firstly characterized and mainly consisted of hydrophilic low …
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SAINS MALAYSIANA - UKM
Flotation: A promising microalgae harvesting and dewatering technology for biofuels production. Biotechnology Journal 11: 315-326. Niaghi, M., Mahdavi, M.A. & Gheshlaghi, R. 2015. Optimization of dissolved air flotation technique in harvesting microalgae from …
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Improving the Energy Balance of an Integrated Microalgal ...
The main alternative to those is the use of dissolved air flotation (DAF). The system generates micro bubbles of air which attach to algae cells and allow them to float . Generation of the bubble is through release of a supersaturated water solution akin to beer production and has an energy associated with it of around 0.3 kWh m −3 .
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Development and intensification of a flotation system ...
flotation techniques including dissolved air flotation and electro-flotation. The algal biomass harvested by flotation was processed directly using hydrothermal liquefaction (HTL) without extra stages for dewatering and drying or intermediate storage.
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[PDF] Harvesting microalgae using ozoflotation releases ...
Combined system for wastewater treatment: Ozonization and coagulation via tannin-based agent for harvesting microalgae by dissolved air flotation. G. A. Oliveira, Ê. L. Machado, Rhauani Segatto Knoll, Naira Dell'Osbel, G. S. Colares, L. Rodrigues
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Sustainable Cost-Effective Microalgae Harvesting Review ...
centrifugation, microstraining, dissolved air flotation, electrolytic flotation, chemical flocculation, bioflocculation, autoflocculation, Filtration. This review highlights the various methods of microalgae harvesting with advantages and future perspective of sustainable and …
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A Comprehensive Overview on Various Method of Harvesting ...
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
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(PDF) Técnicas De Crescimento Da Microalga Dunaliella ...
Palavras-chave: biodiesel, microalgas, biomassa, Dunaliella salina, foto-bio-reator Abstract: When compared to other sources, some species of microalgae present a much larger production of oil. Therefore, they are capable of fulfilling the biodiesel demands to be added to petroleum derived diesel, and even to substitute petroleum diesel as fuel.
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2013。. PhycologiaAlgaeAlgal ResearchJournal of Applied Phycology。. ： (), () ： 86-. ： huqiang#ihb.ac. ：. 1. Richmond A. and Q. Hu (2013) Handbook of …
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Influence of growth phase on harvesting of Chlorella ...
The effects of changes in cellular characteristics and dissolved organic matter (DOM) on dissolved air flotation (DAF) harvesting of Chlorella zofingiensis at the different growth phases were studied.
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Critical evaluation and modeling of algal harvesting using ...
DAF Algal Harvesting Modeling}, author = {Zhang, Xuezhi and Hewson, John C. and Amendola, Pasquale and Reynoso, Monica and Sommerfeld, Milton and Chen, Yongsheng and Hu, Qiang}, abstractNote = {In our study, Chlorella zofingiensis harvesting by dissolved air flotation (DAF) was critically evaluated with regard to algal concentration, culture ...
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Critical Evaluation and Modeling of Algal Harvesting Using ...
Dissolved air flotation (DAF) is a traditional type of flotation and has been reported as an efficient microalgae harvesting method [7] [8] [9][10]. DAF is a method based on the air micro-bubble ...
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Harvesting Marine Microalgae Nannochloropsis sp. using ...
coagulation with dissolved air flotation has also been reported in harvesting freshwater microalgae such as Chlorella zofingiensis and Scenedesmus dimorphus, and marine microalgae such as Nannochloropsis sp. Moreover, lab scale DAF study only been investigated by Kwon et al. (2014) to harvest marine microalgae, Tetraselmis sp.
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The impacts of replacing air bubbles with microspheres for ...
Dissolved Air Flotation (DAF) is a well-known coagulation-flotation system applied at large scale for microalgae harvesting. Compared to conventional harvesting technologies DAF allows high cell recovery at lower energy demand. By replacing microbubbles with microspheres, the innovative Ballasted Di …
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Utah State University DigitalCommons@USU
Optimization of Dissolved Air Flotation for Algal Harvesting at the Logan, Utah Wastewater Treatment Plant by Andrew R. Elder, Master of Science Utah State University, 2011 Major Professor: Dr. Ronald Sims Department: Biological Engineering This research evaluated dissolved air flotation (DAF) as a separation method for algae
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Harvesting Microalgae Biomass by Instant Dissolved Air ...
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 ...
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Flotation harvesting of microalgae - ScienceDirect
Any microalgae remaining after dissolved air flotation (DAF), where the water is recycled and pressurized to produce small air bubbles, are commonly single, non-flocculated cells . The electrostatic interaction between the microalgae and the coagulant is crucial [40], [44] .
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