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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Harvesting microalgae for biofuel : processes and mechanisms

Osborne, Allison Lenore 17 September 2010 (has links)
The application of microalgae for biofuel production is a subject of increasing interest as fuel prices continue to fluctuate and the United States aims to secure a reliable, domestic fuel source. Though microalgae have proven to be very efficient at producing oil-rich lipids, the optimum conditions for algae cultivation and methods for harvesting and oil extraction have not been determined. In particular, the harvesting component is especially important to the effectiveness of the overall process because of the large volumes of algae-rich water that must be processed, the strict requirements for downstream lysing, oil extraction and fuel production and the necessity to generate algae biomass with significant post-extraction byproduct value. A number of solid-liquid separation technologies have shown some potential for achieving microalgae/water separation; however, application of these processes to biofuel production requires an evaluation of treatment effectiveness as a function of water quality, algae particle characteristics, and process chemistry. The goal of this research was to identify and evaluate several potentially viable harvesting methods that could be incorporated into end-to-end algae to biofuel production. To achieve this goal, a literature review was conducted to identify the most promising harvesting methods for biofuel applications, and bench scale tests were performed for several harvesting processes. A number of significant findings were identified. Batch algae coagulation experiments with ferric chloride, chitosan, and pH-induced autoflocculation suggest that coagulants can provide effective treatment, but the effectiveness is dependent on water composition and pH. Electrocoagulation experiments indicated that dissolution of the sacrificial electrode led to high metal concentrations in the algae. Pre-oxidation with ozone increased the removal of freshwater Neochloris oleobundans by 20-80% after subsequent flocculation and sedimentation compared with non-ozonated samples. Most notably, this research identified the importance of optimizing water quality and algae particle characteristics for a particular algae harvesting process. Implementing a harvesting process that takes advantage of the natural constituents of a water and the surface characteristics of an algae culture, minimize treatment requirements and enables smoother integration with subsequent processing steps. / text
2

Experimental harvests of macroalgae along the Oregon coast with an analysis of associated epiphytic diatom communities

Young, John J. January 2003 (has links)
Typescript. Includes vita and abstract. Bibliography: Includes bibliographical references (leaves 91-99). Description: xi, 99 leaves : ill., maps ; 29 cm.
3

A technique for harvesting unicellular algae using colloidal gas aphrons

Honeycutt, Susan Smith January 1983 (has links)
M. S.
4

A technique for harvesting unicellular algae using colloidal gas aphrons

Honeycutt, Susan Smith January 1983 (has links)
Unicellular algae have proven to be extremely difficult to separate from their liquid environment, and at the present time no economical process exists. A novel technique using colloidal gas aphrons (CGA) has been investigated for harvesting <i>Chlorella vulgaris</i>, a green algae, from dilute suspension. CGA dispersions consist of very small gas bubbles, on the order of 25 microns in diameter, that are each encapsulated in an aqueous shell of surfactant solution. The process is based on the technology of CGA flotation, which involves the formation of algae-bubble complexes (possibly including dissolved inorganic ions) and their subsequent flotation into a stable froth at the surface. At neutral pH, the efficiency of algae removal was maximized when a cationic surfactant (lauryl pyridinium chloride) was used for CGA generation. At pH 10, both the cationic and anionic (sodium dodecyl benzene sulfonate> CGA dispersions yielded comparable removals. Addition of small quantities of alum (to 10<sup>-4</sup> M) improved removals using the cationic CGA, and at pH 10 this combination yielded the maximum removals that were achieved: 52.1% removal after a single application of CGA dispersion (1 to 1, dispersion to sample volume ratio), and 89.2% removal after an additional application. Although the of CGA-flotation has yet to be determined, it is proposed that the process occurs through the interaction of the CGA bubbles, the algal cells, and possibly dissolved ions to form buoyant flocs. / M.S.
5

Cable-Suspended Robot System with Real Time Kinematics GPS Position Correction for Algae Harvesting

Pagan, Jesus Manuel January 2018 (has links)
No description available.

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