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Development of a novel algae biofilm photobioreactor for biofuel production

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  1. Tez No: 400022
  2. Yazar: ALTAN ÖZKAN
  3. Danışmanlar: HALİL BERBEROĞLU
  4. Tez Türü: Doktora
  5. Konular: Çevre Mühendisliği, Environmental Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2012
  8. Dil: İngilizce
  9. Üniversite: The University of Texas at Austin
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 200

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Özet (Çeviri)

Algae are photosynthetic microorganisms that convert carbon dioxideand sunlight into biomass that can be used for biofuel production. Althoughthey are usually cultivated in suspension, these microorganisms are capableof forming productive biolms over substrata given the right conditions. Thisdissertation focuses on algal biolms and their application in biofuel feedstockproduction. In particular it reports the construction and performance of analgae biolm photobioreactor, the physico-chemical surface properties of differentalgal species and adhesion substrata, and cell-surface interactions basedon experimental results and theoretical models.A novel algae biolm photobioreactor was constructed and operated(i) to demonstrate the proof of concept, (ii) to analyze the performance ofthe system, and (iii) to determine the key advantages and short comings forfurther research. The results indicated that signicant reductions in water andenergy requirements were possible with the biolm photobioreactor. Althoughthe system achieved net energy ratio of about 6, the overall productivity waslow as Botryococcus branunii is notoriously slow growing algae. Thus, furtherstudies were focused on identication of algal species capable of biolm growthwith larger biomass and lipid productivities.Adhesion of cells to substrata precedes the formation of all biolms. Acomprehensive study has been conducted to determine the interactions of aplanktonic and a benthic algal species with hydrophilic and hydrophobic substrata.The physico-chemical surface properties of the algal cells and substratawere determined and using these data, cell-substrata interactions were modeledwith the thermodynamic, Derjaguin, Landau Verwey, Overbeek (DLVO)and Extended Derjaguin, Landau Verwey, Overbeek (XDLVO) approaches andcritical parameters for algal adhesion were identied. Finally, the adhesion rateand strength of algal species were quantied with parallel plate ow chamberexperiments. The results indicated that both cell and substrata surface hydrophobicityplayed a critical role for the adhesion rate and strength of thecells and XDLVO approach was the most accurate model. Finally, based onthese ndings the physico-chemical surface properties of ten algal species andsix substrata were quantied and a screening was done to determine algaespecies substratum couples favoring adhesion and biolm formation.

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