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Recovery of intermittent cycle extended aeration system sludge through conversion into biodiesel by in-situ transesterification

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  • Hatami, Behnam
  • Ebrahimi, Aliasghar
  • Ehrampoush, Mohammad Hassan
  • Salmani, Mohammad Hossein
  • Dalvand, Arash
  • Pirmoradi, Neda
  • Angelidaki, Irini
  • Fotidis, Ioannis A.
  • Mokhtari, Mehdi

Abstract

The feasibility of using intermittent cycle extended aeration system (ICEAS) sludge as a lipid feedstock for biodiesel production was investigated. The main effects of in situ transesterification parameters, reaction temperature (30–70 °C), reaction time (4–24 h), catalyst concentration (1–5% v/v), and proportion of methanol to dry sludge (5–25 ml/g) at five-levels as well as their simultaneous interactions were evaluated to develop an empirical model. Optimized conditions were obtained at 60 °C, 4.65% (v/v) H2SO4, 17.84 h reaction time, and 5:1 methanol to dry sludge proportion (ml/g), leading to a maximum of 18.58% (w/w) biodiesel yield with 94.23% fatty acid methyl ester content. This result was higher in comparison with yields derived from conventional activated sludge, membrane bioreactor and anaerobic-anoxic-oxic processes. The ICEAS technology advantages are owned to its different configurations leading to production of one blended sludge, shorter hydraulic retention time and higher chemical oxygen demand to nitrogen ratios. The predominance of fatty acid methyl esters such as palmitic, oleic, palmitoleic, stearic, linoleic and myristic acid methyl ester, in the obtained biodiesel, indicated suitability of ICEAS sludge as feedstock for biodiesel production.

Suggested Citation

  • Hatami, Behnam & Ebrahimi, Aliasghar & Ehrampoush, Mohammad Hassan & Salmani, Mohammad Hossein & Dalvand, Arash & Pirmoradi, Neda & Angelidaki, Irini & Fotidis, Ioannis A. & Mokhtari, Mehdi, 2021. "Recovery of intermittent cycle extended aeration system sludge through conversion into biodiesel by in-situ transesterification," Renewable Energy, Elsevier, vol. 163(C), pages 56-65.
    • Handle: RePEc:eee:renene:v:163:y:2021:i:c:p:56-65
    DOI: 10.1016/j.renene.2020.08.116
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    References listed on IDEAS

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    1. Borah, Manash Jyoti & Devi, Anuchaya & Saikia, Raktim Abha & Deka, Dhanapati, 2018. "Biodiesel production from waste cooking oil catalyzed by in-situ decorated TiO2 on reduced graphene oxide nanocomposite," Energy, Elsevier, vol. 158(C), pages 881-889.
    2. Meher, L.C. & Vidya Sagar, D. & Naik, S.N., 2006. "Technical aspects of biodiesel production by transesterification--a review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 10(3), pages 248-268, June.
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    1. Pirmoradi, Neda & Ghaneian, Mohammad Taghi & Ehrampoush, Mohammad Hassan & Salmani, Mohammad Hossein & Hatami, Behnam, 2021. "The conversion of poultry slaughterhouse wastewater sludge into biodiesel: Process modeling and optimization," Renewable Energy, Elsevier, vol. 178(C), pages 1236-1249.

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