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Effect of Aqueous Ammonia Soaking on the Methane Yield and Composition of Digested Manure Fibers Applying Different Ammonia Concentrations and Treatment Durations

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  • Chrysoula Mirtsou-Xanthopoulou

    (Section for Sustainable Biotechnology, Chemistry and Environmental Engineering, Department of Biotechnology, Aalborg University, Copenhagen (AAU-Cph), A C Meyers Vænge 15, DK 2450 Copenhagen, Denmark)

  • Esperanza Jurado

    (Section for Sustainable Biotechnology, Chemistry and Environmental Engineering, Department of Biotechnology, Aalborg University, Copenhagen (AAU-Cph), A C Meyers Vænge 15, DK 2450 Copenhagen, Denmark)

  • Ioannis V. Skiadas

    (Section for Sustainable Biotechnology, Chemistry and Environmental Engineering, Department of Biotechnology, Aalborg University, Copenhagen (AAU-Cph), A C Meyers Vænge 15, DK 2450 Copenhagen, Denmark)

  • Hariklia N. Gavala

    (Section for Sustainable Biotechnology, Chemistry and Environmental Engineering, Department of Biotechnology, Aalborg University, Copenhagen (AAU-Cph), A C Meyers Vænge 15, DK 2450 Copenhagen, Denmark)

Abstract

The continuously increasing demand for renewable energy sources renders anaerobic digestion one of the most promising technologies for renewable energy production. Due to the animal production intensification, manure is being used as the primary feedstock for most biogas plants. Thus, their economical profitable operation relies on increasing the methane yield from manure, and especially of its solid fraction which is not so easily degradable. In the present study, aqueous ammonia soaking (AAS) at six different concentrations in ammonia (5%, 10%, 15%, 20%, 25% and 32%) and for 1, 3 and 5 days at 22 °C was applied on digested fibers separated from the effluent of a manure-fed, full-scale anaerobic digester. A methane yield increase from 76% to 104% was achieved during the first series of experiments, while the difference in reagent concentration did not considerably affect the methane yield. It was shown that the optimal duration was three days for both 5% and 25% w/w reagent concentrations in ammonia tested. Carbohydrates and phosphorus content remained unaffected, while a slight decrease in Klason lignin and non-soluble organic nitrogen content was observed after AAS. It is concluded that AAS is a very promising treatment resulting to an overall increase of the methane yield of digested manure fibers from 76% to 265% depending on the conditions and the batch of digested fibers used (an even higher increase of 190%–265% was achieved during the 2nd series of experiments, where different AAS durations were tested, compared to the 1st series were different ammonia concentrations were applied).

Suggested Citation

  • Chrysoula Mirtsou-Xanthopoulou & Esperanza Jurado & Ioannis V. Skiadas & Hariklia N. Gavala, 2014. "Effect of Aqueous Ammonia Soaking on the Methane Yield and Composition of Digested Manure Fibers Applying Different Ammonia Concentrations and Treatment Durations," Energies, MDPI, vol. 7(7), pages 1-12, June.
  • Handle: RePEc:gam:jeners:v:7:y:2014:i:7:p:4157-4168:d:37670
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    References listed on IDEAS

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    1. Jurado, Esperanza & Skiadas, Ioannis V. & Gavala, Hariklia N., 2013. "Enhanced methane productivity from manure fibers by aqueous ammonia soaking pretreatment," Applied Energy, Elsevier, vol. 109(C), pages 104-111.
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    Cited by:

    1. Bolzonella, D. & Battista, F. & Mattioli, A. & Nicolato, C. & Frison, N. & Lampis, S., 2020. "Biological thermophilic post hydrolysis of digestate enhances the biogas production in the anaerobic digestion of agro-waste," Renewable and Sustainable Energy Reviews, Elsevier, vol. 134(C).
    2. Marco Baldi & Maria Cristina Collivignarelli & Alessandro Abbà & Ilaria Benigna, 2018. "The Valorization of Ammonia in Manure Digestate by Means of Alternative Stripping Reactors," Sustainability, MDPI, vol. 10(9), pages 1-14, August.
    3. Cristiane Romio & Michael Vedel Wegener Kofoed & Henrik Bjarne Møller, 2021. "Digestate Post-Treatment Strategies for Additional Biogas Recovery: A Review," Sustainability, MDPI, vol. 13(16), pages 1-27, August.

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