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Autohydrolysis and alkaline pretreatment effect on Chlorella vulgaris and Scenedesmus sp. methane production

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  • Mahdy, Ahmed
  • Mendez, Lara
  • Ballesteros, Mercedes
  • González-Fernández, Cristina

Abstract

Among biofuel production processes using microalgae biomass, biogas generation seems to be the least complex. Nevertheless, its efficiency is hampered due to the hard cell wall. In order to enhance its anaerobic biodegradability, the present investigation evaluated the effect of two pretreatments (low temperature autohydrolysis at 50 °C for 24 and 48 h incubation and alkaline (0.5, 2 and 5% w/w NaOH dosages)) on Chlorella vulgaris and Scenedesmus sp. The autohydrolysis resulted in 16 and 6% chemical oxygen demand (COD) solubilisation for Chlorella and Scenedesmus, respectively. During thermoalkaline pretreatment, COD in soluble phase (CODsol) was increased up to 19% for Chlorella and 17% for Scenedesmus sp. The highest carbohydrates solubilisation corresponded to 2 and 5% w/w NaOH dosage for 48 h at 50 °C for Chlorella (20%) and Scenedesmus (40–43%). When compared to Chlorella, Scenedesmus biomass exhibited higher carbohydrates solubilisation, although methane yield enhancement was low for both substrates. Best case scenario for Scenedesmus sp. (20% increase) was attained with 5% NaOH at 50 °C for 24 h. Despite the lower carbohydrates solubilisation observed for Chlorella, similar methane yields were similar to Scenedesmus sp. The low methane production enhancement was ascribed to the fact that the organic matter solubilised were exopolymers released during pretreatments rather than intracellular material.

Suggested Citation

  • Mahdy, Ahmed & Mendez, Lara & Ballesteros, Mercedes & González-Fernández, Cristina, 2014. "Autohydrolysis and alkaline pretreatment effect on Chlorella vulgaris and Scenedesmus sp. methane production," Energy, Elsevier, vol. 78(C), pages 48-52.
    • Handle: RePEc:eee:energy:v:78:y:2014:i:c:p:48-52
    DOI: 10.1016/j.energy.2014.05.052
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    References listed on IDEAS

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    1. Yuan, Xingzhong & Wang, Jingyu & Zeng, Guangming & Huang, Huajun & Pei, Xiaokai & Li, Hui & Liu, Zhifeng & Cong, Minghui, 2011. "Comparative studies of thermochemical liquefaction characteristics of microalgae using different organic solvents," Energy, Elsevier, vol. 36(11), pages 6406-6412.
    2. Sambusiti, C. & Monlau, F. & Ficara, E. & Carrère, H. & Malpei, F., 2013. "A comparison of different pre-treatments to increase methane production from two agricultural substrates," Applied Energy, Elsevier, vol. 104(C), pages 62-70.
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    1. Hu, Yulin & Gong, Mengyue & Feng, Shanghuan & Xu, Chunbao (Charles) & Bassi, Amarjeet, 2019. "A review of recent developments of pre-treatment technologies and hydrothermal liquefaction of microalgae for bio-crude oil production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 101(C), pages 476-492.
    2. Parimi, Naga Sirisha & Singh, Manjinder & Kastner, James R. & Das, Keshav C., 2015. "Biomethane and biocrude oil production from protein extracted residual Spirulina platensis," Energy, Elsevier, vol. 93(P1), pages 697-704.
    3. Zabed, Hossain M. & Akter, Suely & Yun, Junhua & Zhang, Guoyan & Zhang, Yufei & Qi, Xianghui, 2020. "Biogas from microalgae: Technologies, challenges and opportunities," Renewable and Sustainable Energy Reviews, Elsevier, vol. 117(C).
    4. Llamas, Mercedes & Magdalena, Jose Antonio & Tomás-Pejó, Elia & González-Fernández, Cristina, 2020. "Microalgae-based anaerobic fermentation as a promising technology for producing biogas and microbial oils," Energy, Elsevier, vol. 206(C).

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