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Experimental Study of Increase of Biogas Production from Lagoon Station's Sludge by Alkaline Pretreatment

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  • Mohamed El Amine DAHOU
  • Mohammed HADJ KOUIDER
  • Siham Dehmani
  • Abdelmadjid HABCHI
  • Said SLIMANI

Abstract

The present research focuses on the experimental study of the effect of alkaline pretreatment with NaOH on biogas production. Different concentrations of NaOH, i.e. 1, 2.5 and 5% (w/w), were tested on the lagoon station's sludge (dry basis) at room temperature for 24 h. The results obtained after 60 days of digestion, through the cumulative volume of biogas recorded, clearly indicate a positive effect of the chemical alkaline pretreatment on the anaerobic digestion since the amount of biogas produced increased by 42.6% when the NaOH concentration was close to 2.5%. This concentration is considered optimal under the chosen conditions. Indeed, inhibition of the methanogenic activity and a blockage of the digestion process are observed beyond this concentration. These results suggest that the alkaline pretreatment can improve the energy efficiency of the obtained biogas (CH 4 content) and reduce the residence time.

Suggested Citation

  • Mohamed El Amine DAHOU & Mohammed HADJ KOUIDER & Siham Dehmani & Abdelmadjid HABCHI & Said SLIMANI, 2023. "Experimental Study of Increase of Biogas Production from Lagoon Station's Sludge by Alkaline Pretreatment," Energy & Environment, , vol. 34(5), pages 1492-1508, August.
    • Handle: RePEc:sae:engenv:v:34:y:2023:i:5:p:1492-1508
    DOI: 10.1177/0958305X221088569
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    References listed on IDEAS

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    1. Ariunbaatar, Javkhlan & Panico, Antonio & Esposito, Giovanni & Pirozzi, Francesco & Lens, Piet N.L., 2014. "Pretreatment methods to enhance anaerobic digestion of organic solid waste," Applied Energy, Elsevier, vol. 123(C), pages 143-156.
    2. Du, Jing & Qian, Yuting & Xi, Yonglan & Lü, Xiwu, 2019. "Hydrothermal and alkaline thermal pretreatment at mild temperature in solid state for physicochemical properties and biogas production from anaerobic digestion of rice straw," Renewable Energy, Elsevier, vol. 139(C), pages 261-267.
    3. Neshat, Soheil A. & Mohammadi, Maedeh & Najafpour, Ghasem D. & Lahijani, Pooya, 2017. "Anaerobic co-digestion of animal manures and lignocellulosic residues as a potent approach for sustainable biogas production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 79(C), pages 308-322.
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