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Performance and Kinetics of Anaerobic Digestion of Sewage Sludge Amended with Zero-Valent Iron Nanoparticles, Analyzed Using Sigmoidal Models

Author

Listed:
  • Luiza Usevičiūtė

    (Research Institute of Environmental Protection, Vilnius Gediminas Technical University, LT-10223 Vilnius, Lithuania)

  • Tomas Januševičius

    (Research Institute of Environmental Protection, Vilnius Gediminas Technical University, LT-10223 Vilnius, Lithuania)

  • Vaidotas Danila

    (Research Institute of Environmental Protection, Vilnius Gediminas Technical University, LT-10223 Vilnius, Lithuania)

  • Aušra Mažeikienė

    (Research Institute of Environmental Protection, Vilnius Gediminas Technical University, LT-10223 Vilnius, Lithuania)

  • Alvydas Zagorskis

    (Research Institute of Environmental Protection, Vilnius Gediminas Technical University, LT-10223 Vilnius, Lithuania)

  • Mantas Pranskevičius

    (Research Institute of Environmental Protection, Vilnius Gediminas Technical University, LT-10223 Vilnius, Lithuania)

  • Eglė Marčiulaitienė

    (Research Institute of Environmental Protection, Vilnius Gediminas Technical University, LT-10223 Vilnius, Lithuania)

Abstract

Sewage sludge was treated with nanoscale zero-valent iron (nZVI) to enhance biogas and methane (CH 4 ) production, and the influence of key parameters on the material’s anaerobic digestion (AD) efficiency was analyzed using sigmoidal mathematical models. In this study, three dosages of nZVI (0.5%, 1.5% and 3%) were added to the anaerobic sludge digestion system to enhance and accelerate the sludge decomposition process. The results showed that cumulative biogas yield after 41 days of digestion increased by 23.9% in the reactor with a nZVI dosage of 1.5%. Correspondingly, the highest CH 4 production enhancement by 21.5% was achieved with a nZVI dosage of 1.5% compared to the control. The results indicated that this nZVI dosage was optimal for the AD system, as it governed the highest biogas and CH 4 yields and maximum removal of total and volatile solids. Additionally, to predict biogas and CH 4 yields and evaluate kinetic parameters, eight kinetic models were applied. According to the results of the modified Gompertz, Richards and logistic models, the nZVI dosage of 1.5% shortened the biogas lag phase from 11 to 5 days compared to the control. The Schnute model provided the best fit to the experimental biogas and CH 4 data due to highest coefficients of determination (R 2 : 0.9997–0.9999 at 1.5% and 3% nZVI dosages), as well as the lowest Akaike’s Information Criterion values and errors. This demonstrated its superior performance compared to other models.

Suggested Citation

  • Luiza Usevičiūtė & Tomas Januševičius & Vaidotas Danila & Aušra Mažeikienė & Alvydas Zagorskis & Mantas Pranskevičius & Eglė Marčiulaitienė, 2025. "Performance and Kinetics of Anaerobic Digestion of Sewage Sludge Amended with Zero-Valent Iron Nanoparticles, Analyzed Using Sigmoidal Models," Energies, MDPI, vol. 18(6), pages 1-24, March.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:6:p:1425-:d:1611390
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    References listed on IDEAS

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