Keywords
Abstract
Energy consumption of fossil fuel which keeps increasing has led to the urgency of research and development on the field of renewable energy for the future. Microalgae are considered to be the most promising new source of biomass compared with first and second-generation feedstocks. A great challenge is a choice of an effective approach for microalgae harvesting. Additional challenges of microalgae harvesting come from the small size of microalgae cells (3-30µm) and the similarity of the density of the microalgae cells to the growth medium. This research is aimed to determine the appropriate microalgae harvesting technology for bio-crude oil production. Several potential microalgae harvesting technologies are centrifugation, filtration, inorganic flocculation, organic flocculation, bioflocculation, electrocoagulation, and flocculation-sedimentation. The method used in this research is Analytic Hierarchy Process (AHP). The results indicate that the parameters taken into consideration are energy need (0.339), cost (0.214), risk of contamination (0.098), efficiency (0.133), technology availability (0.066), microalgae strain flexibility (0.079), and production time (0.071). In a case study, the pairwise comparison of seven alternatives each for the harvesting and seven criteria are compared. The best alternative that can be recommended as a microalgae harvesting technology is flocculation-sedimentation with a weight of 0.202.
References
[2] Viswanath B, Mutanda T, White S, Bux F., “The microalgae – a future source of biodiesel”. Dynam Biochem, Process Biotechnol Mol Biol, 4(1):37–47, 2010.
[3] Christenson L, and Sims R., “Production and harvesting of microalgae for wastewater treatment, biofuels, and bioproducts”, Biotechnol Adv, 29:686–702, 2011.
[4] Mathimani T, and Mallick N., “A comprehensive review on harvesting of microalgae for biodiesel – key challenges and future directions”, Renew Sustain Energy Rev; 91:1103–20, 2018.
[5] T. L. Saaty, 1986, “Decision Making for Leaders, The Analytical Hierarchy Process for Decision in Complex World”, Pitsburgh: University of Pitsburgh, 1986.
[6] T. L. Saaty, “Decision making with the analytic hierarchy process,”Int. J. Services Science 1, no. 1, 85-98, 2008.
[7] Unay, E., Ozkaya, B., and Yoruklu, H. C., “A multicriteria decision analysis for the evaluation of microalgal growth and harvesting”, Chemosphere, 279, 130561, 2021.
[8] Ortiz, A., García-Galán, M. J., García, J., and Díez-Montero, R., “Optimization and operation of a demonstrative full scale microalgae harvesting unit based on coagulation, flocculation and sedimentation”, Separation and Purification Technology, 259 (November 2020), 2021.
[9] Tan, J., Low, K. Y., Sulaiman, N. M. N., Tan, R. R., & Promentilla, M. A. B., “Fuzzy analytical hierarchy process (AHP) for multi-criteria selection in drying and harvesting process of microalgae system”, Chemical Engineering Transactions, 45, 829–834, 2015.
[10] Al-hattab, M., Ghaly, A., Hammouda, A., “Microalgae harvesting methods for industrial production of biodiesel: critical review and comparative analysis”, J. Fund. Renew. Energy Appl. 5, 154, 2015.
[11] Fasaei, F., Bitter, J. H., Slegers, P. M., and van Boxtel, A. J. B., “Techno-economic evaluation of microalgae harvesting and dewatering systems”, Algal Research, 31, 347–362, 2018.
[12] Ferreira, J., de Assis, L. R., Oliveira, A. P. de S., Castro, J. de S., and Calijuri, M. L., “Innovative microalgae biomass harvesting methods: Technical feasibility and life cycle analysis”, Science of the Total Environment, 746, 2020.
[13] Li, S., Hu, T., Xu, Y., Wang, J., Chu, R., Yin, Z., Mo, F., and Zhu, L., “A review on flocculation as an efficient method to harvest energy microalgae: Mechanisms, performances, influencing factors and perspectives”, Renewable and Sustainable Energy Reviews, 131(May), 2020.
[14] Nwokoagbara, E., Olaleye, A. K., and Wang, M., “Biodiesel from microalgae: The use of multi-criteria decision analysis for strain selection”, Fuel, 159, 241–249, 2015.
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