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Optimization of Operating Parameters for Two-Phase Anaerobic Digestion Treating Slaughterhouse Wastewater for Biogas Production: Focus on Hydrolytic–Acidogenic Phase

Author

Listed:
  • Dejene Tsegaye

    (Center for Environmental Science, College of Natural and Computational Science, Addis Ababa University, Addis Ababa P.O. Box 1176, Ethiopia)

  • Mohammed Mazharuddin Khan

    (Center for Environmental Science, College of Natural and Computational Science, Addis Ababa University, Addis Ababa P.O. Box 1176, Ethiopia)

  • Seyoum Leta

    (Center for Environmental Science, College of Natural and Computational Science, Addis Ababa University, Addis Ababa P.O. Box 1176, Ethiopia)

Abstract

In a two-phase anaerobic digestion process, enhanced biogas production and organic pollutant removal depend on the stability and performance of the hydrolytic–acidogenic and methanogenic phases. Additionally, the hydrolytic–acidogenic phase is a rate-limiting step, which calls for the further optimization of operating parameters. The objective of this study was to optimize the operating parameters of the hydrolytic–acidogenic reactor (HR) in the two-phase anaerobic digestion treating slaughterhouse wastewater. The experiment was carried using bench-scale sequential bioreactors. The hydrolytic–acidogenic reactor operating parameters were optimized for six different hydraulic retention times (HRTs) (6–1 day) and organic loading rates (OLRs) (894.41 ± 32.56–5366.43 ± 83.80 mg COD/L*day). The degree of hydrolysis and acidification were mainly influenced by lower HRT (higher OLR), and the highest values of hydrolysis and acidification were 63.92% and 53.26% at an HRT of 3 days, respectively. The findings indicated that, at steady state, the concentrations of soluble chemical oxygen demand (SCOD) and total volatile fatty acids (TVFAs) decrease as HRT decreases and OLR increases from HRTs of 3 to 1 day and 894.41–1788.81 mg COD/L*day, respectively, and increase as the HRT decreases from 6 to 4 days. The concentration of NH 4 + -N ranges from 278.67 to 369.46 mg/L, which is not in the range that disturbs the performance and stability of the hydrolytic acidogenic reactor. It was concluded that an HRT of 3 days and an ORL of 1788.81 mg COD/L*day were selected as optimal operating conditions for the high performance and stability of the two-phase anaerobic digestion of slaughterhouse wastewater in the hydrolytic–acidogenic reactor at a mesophilic temperature. The findings of this study can be applicable for other agro-process industry wastewater types with similar characteristics and biowaste for value addition and sustainable biowaste management and safe discharge.

Suggested Citation

  • Dejene Tsegaye & Mohammed Mazharuddin Khan & Seyoum Leta, 2023. "Optimization of Operating Parameters for Two-Phase Anaerobic Digestion Treating Slaughterhouse Wastewater for Biogas Production: Focus on Hydrolytic–Acidogenic Phase," Sustainability, MDPI, vol. 15(6), pages 1-16, March.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:6:p:5544-:d:1103540
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    References listed on IDEAS

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    1. Chatterjee, Biswabandhu & Mazumder, Debabrata, 2019. "Role of stage-separation in the ubiquitous development of Anaerobic Digestion of Organic Fraction of Municipal Solid Waste: A critical review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 104(C), pages 439-469.
    2. Theresa Menzel & Peter Neubauer & Stefan Junne, 2020. "Role of Microbial Hydrolysis in Anaerobic Digestion," Energies, MDPI, vol. 13(21), pages 1-29, October.
    3. Alemayehu Haddis & Adriaan de Geyter & Ilse Smets & Bart Van der Bruggen, 2014. "Wastewater management in Ethiopian higher learning institutions: functionality, sustainability and policy context," Journal of Environmental Planning and Management, Taylor & Francis Journals, vol. 57(3), pages 369-383, March.
    4. Fernando Canul Bacab & Elda España Gamboa & Juan Enrique Ruiz Espinoza & Rosa M Leal-Bautista & Raúl Tapia Tussell & Jorge Domínguez Maldonado & Blondy Canto Canché & Liliana Alzate-Gaviria, 2020. "Two Phase Anaerobic Digestion System of Municipal Solid Waste by Utilizing Microaeration and Granular Activated Carbon," Energies, MDPI, vol. 13(4), pages 1-19, February.
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