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Multi-Parametric Analysis Based on Physico-Chemical Characterization and Biochemical Methane Potential Estimation for the Selection of Industrial Wastes as Co-Substrates in Anaerobic Digestion

Author

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  • Luz Marina Ruiz

    (Environmental Technologies, Civil Engineering Department, E.T.S.I. Caminos, Canales y Puertos, University of Granada, Dr. Severo Ochoa St., 18071 Granada, Spain)

  • María Fernández

    (Environmental Technologies, Civil Engineering Department, E.T.S.I. Caminos, Canales y Puertos, University of Granada, Dr. Severo Ochoa St., 18071 Granada, Spain)

  • Ana Genaro

    (Empresa Municipal de Abastecimiento y Saneamiento de Granada S.A., Molinos St., 58-60, 18009 Granada, Spain)

  • Jaime Martín-Pascual

    (Environmental Technologies, Civil Engineering Department, E.T.S.I. Caminos, Canales y Puertos, University of Granada, Dr. Severo Ochoa St., 18071 Granada, Spain)

  • Montserrat Zamorano

    (Environmental Technologies, Civil Engineering Department, E.T.S.I. Caminos, Canales y Puertos, University of Granada, Dr. Severo Ochoa St., 18071 Granada, Spain)

Abstract

Anaerobic digestion is considered as one of the most feasible waste-to-energy technologies for the valorization of organic wastes. It can be applied to many different substrates but the mono-digestion of a single substrate usually has some important drawbacks due to the physico-chemical characteristics of the substrate. A feasible solution is the simultaneous co-digestion of several substrates with different composition and characteristics, so that synergetic effects may be generated and physico-chemical characteristics may be compensated, thus reaching higher process efficiencies and biogas production rates. In this work, a multi-parametric analysis for the objective comparison of industrial wastes was developed in order to help with decision making about their suitability as a co-substrate in anaerobic co-digestion. Criteria considered for this analysis included sample composition, C/N ratios, theoretical biochemical methane potential (BMP), and other important issues such as production rates, seasonality, and the distance to the WWTP or pre-treatment requirements. Results showed that, among the 13 evaluated wastes, 2 of them showed a higher potential for being used in anaerobic co-digestion: 1. Fried corn from the snack food industry and 2. Wet fatty pomace from the olive oil industry. Both wastes showed high estimated BMP values, high lipid and carbohydrate content, and C/N ratios in a proper range to improve the low C/N ratio of sewage sludge. Other wastes such as olive pomace (dry), skinless corn (not fried), and grape pomace from the winery industry may also be used as co-substrates. As a conclusion, this procedure based on a selection matrix can be considered as a useful tool to help both producers and WWTP operators to make decisions about the potential applicability of specific industrial wastes as co-substrates in anaerobic co-digestion.

Suggested Citation

  • Luz Marina Ruiz & María Fernández & Ana Genaro & Jaime Martín-Pascual & Montserrat Zamorano, 2023. "Multi-Parametric Analysis Based on Physico-Chemical Characterization and Biochemical Methane Potential Estimation for the Selection of Industrial Wastes as Co-Substrates in Anaerobic Digestion," Energies, MDPI, vol. 16(14), pages 1-19, July.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:14:p:5444-:d:1196335
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    References listed on IDEAS

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