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Title: Development and optimisation of effective approach to cultivate and dewater microalgae biomass for biofuels production
Author: Anyanwu, Ruth Chinyere
ISNI:       0000 0004 8500 857X
Awarding Body: University of the West of Scotland
Current Institution: University of the West of Scotland
Date of Award: 2018
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Cultivation and dewatering have been identified as essential stages for biofuels application. This research has examined two aspects that are key issues for commercialisation which are cultivation and dewatering. C. vulgaris and S. quadricauda were cultivated using a closed photobioreactor (PBR) at varying residence times with different wavelength conditions involving different light emitting diode (LED), using white, red and green LEDs respectively. A novel approach for cultivation by mimicking nature and incorporating some period of darkness during cultivation as to reduce energy was developed. Experimental results obtained in this study indicated that a white LED is most effective than green LED in increasing microalgae growth rate and biomass productivity. Furthermore, the cultivated algae were used to carry out three dewatering experiments: centrifugation, tray drying and freeze drying. Experimental results proved that centrifugation is an effective technique for dewatering microalgae under specific conditions. This is proven to be true for both species with C. vulgaris yielding a maximum dewatering efficiency of 91% and S. quadricauda producing a yield of 82%. An optimum dewatering efficiency of 94.54% was achieved at 50 oC and 4 m/s for tray drier. This study therefore provides novel knowledge on the specific impact of light sources and duration on algal culture. The next step is to investigate other light spectrums, techno-economic analysis and combine scalability of these processes for industrial applications.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available