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Performance evaluation of different cationic flocculants through pH modulation for efficient harvesting of Chlorella sp. HS2 and their impact on water reusability

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  • Nayak, Manoranjan
  • Rashid, Naim
  • Suh, William I.
  • Lee, Bongsoo
  • Chang, Yong Keun

Abstract

Flocculation is an effective technique for harvesting microalgae due to low energy input and being scalable up to industrial algaculture. In this study, four different flocculants at various concentration, and pH levels were employed for the harvesting of Chlorella sp. HS2. Among the tested flocculants, chitosan showed the highest flocculation efficiency of 99.6% ± 0.25 at 10 mg L−1 dosage, pH 8.0 and 30 min of sedimentation. It turned out that the choice of flocculants had minimum impact on the fatty acids methyl ester (FAME) yield and composition. When the reusability of the spent medium for each flocculant was investigated, the culture supernatant obtained from chitosan-based harvesting method had lower growth inhibitory effects in comparison to those harvested using the other flocculants. The cost analysis also favored chitosan-based flocculation, because it returned the highest flocculant efficiency while the flocculant dosage was the lowest. Due to its high harvest efficiency and low impact on the water footprint, it was concluded that the chitosan offer promising advantages over other flocculants.

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  • Nayak, Manoranjan & Rashid, Naim & Suh, William I. & Lee, Bongsoo & Chang, Yong Keun, 2019. "Performance evaluation of different cationic flocculants through pH modulation for efficient harvesting of Chlorella sp. HS2 and their impact on water reusability," Renewable Energy, Elsevier, vol. 136(C), pages 819-827.
    • Handle: RePEc:eee:renene:v:136:y:2019:i:c:p:819-827
    DOI: 10.1016/j.renene.2019.01.050
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    References listed on IDEAS

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    1. Katiyar, Richa & Gurjar, B.R. & Bharti, Randhir K. & Kumar, Amit & Biswas, Shalini & Pruthi, Vikas, 2017. "Heterotrophic cultivation of microalgae in photobioreactor using low cost crude glycerol for enhanced biodiesel production," Renewable Energy, Elsevier, vol. 113(C), pages 1359-1365.
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    4. Abomohra, Abd El-Fatah & Jin, Wenbiao & Sagar, Vikram & Ismail, Gehan A., 2018. "Optimization of chemical flocculation of Scenedesmus obliquus grown on municipal wastewater for improved biodiesel recovery," Renewable Energy, Elsevier, vol. 115(C), pages 880-886.
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    1. Yin, Zhihong & Chu, Ruoyu & Zhu, Liandong & Li, Shuangxi & Mo, Fan & Hu, Dan & Liu, Chenchen, 2021. "Application of chitosan-based flocculants to harvest microalgal biomass for biofuel production: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 145(C).
    2. Natasha Laraib & Ali Hussain & Arshad Javid & Tahir Noor & Qurat-ul-Ain Ahmad & Asma Chaudhary & Maleeha Manzoor & Muhammad Akmal & Syed Mohsin Bukhari & Waqas Ali & Tae Jin Choi & Peer M. Schenk, 2022. "Recent trends in microalgal harvesting: an overview," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 24(6), pages 8691-8721, June.
    3. Shokravi, Zahra & Shokravi, Hoofar & Atabani, A.E. & Lau, Woei Jye & Chyuan, Ong Hwai & Ismail, Ahmad Fauzi, 2022. "Impacts of the harvesting process on microalgae fatty acid profiles and lipid yields: Implications for biodiesel production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 161(C).

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