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Nitrogen Recovery from Different Livestock Slurries with an Innovative Stripping Process

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  • Ali Heidarzadeh Vazifehkhoran

    (Department of Agricultural and Environmental Sciences, University of Milan, Via G. Celoria, 2, 20133 Milano, Italy)

  • Alberto Finzi

    (Department of Agricultural and Environmental Sciences, University of Milan, Via G. Celoria, 2, 20133 Milano, Italy)

  • Francesca Perazzolo

    (Department of Agricultural and Environmental Sciences, University of Milan, Via G. Celoria, 2, 20133 Milano, Italy)

  • Elisabetta Riva

    (Department of Agricultural and Environmental Sciences, University of Milan, Via G. Celoria, 2, 20133 Milano, Italy)

  • Omar Ferrari

    (Department of Agricultural and Environmental Sciences, University of Milan, Via G. Celoria, 2, 20133 Milano, Italy)

  • Giorgio Provolo

    (Department of Agricultural and Environmental Sciences, University of Milan, Via G. Celoria, 2, 20133 Milano, Italy)

Abstract

Ammonia (NH 3 ) emissions deriving from the management of livestock manure have a significant environmental impact, and therefore it is important to reduce them. Among the available options, the process of NH 3 stripping is promising to remove NH 3 from manures and digestates recovering it as a mineral fertilizer (e.g., ammonium sulfate) that is more widely adoptable on farms. The traditional stripping process takes place in batches; however, in this study, a continuous process was evaluated using a lab scale plant in which four reactors were used in series with different hydraulic retention times (HRTs) of 12 or 20 days. The NH 3 recovery of each reactor was studied for the liquid fraction of pig slurry, dairy cattle slurry and digestate, applying simple headspace aeration. For 20 days of HRT, totals of 92%, 83% and 67% of NH 3 were stripped from the digestate, pig slurry and dairy cattle slurry, respectively. For 12 days of HRT, total NH 3 recoveries were 83%, 60% and 41% for the digestate, pig slurry and dairy cattle slurry, respectively. The inlet NH 3 concentration and inlet total alkalinity had a positive and negative effect, respectively, on the specific NH 3 removal rate for each reactor. Stripping NH 3 on farm scale can abate NH 3 emissions in response to the environmental concerns of European policies.

Suggested Citation

  • Ali Heidarzadeh Vazifehkhoran & Alberto Finzi & Francesca Perazzolo & Elisabetta Riva & Omar Ferrari & Giorgio Provolo, 2022. "Nitrogen Recovery from Different Livestock Slurries with an Innovative Stripping Process," Sustainability, MDPI, vol. 14(13), pages 1-17, June.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:13:p:7709-:d:846707
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    References listed on IDEAS

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    1. 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.
    2. Palakodeti, Advait & Azman, Samet & Rossi, Barbara & Dewil, Raf & Appels, Lise, 2021. "A critical review of ammonia recovery from anaerobic digestate of organic wastes via stripping," Renewable and Sustainable Energy Reviews, Elsevier, vol. 143(C).
    3. Giorgio Provolo & Gabriele Mattachini & Alberto Finzi & Martina Cattaneo & Viviana Guido & Elisabetta Riva, 2018. "Global Warming and Acidification Potential Assessment of a Collective Manure Management System for Bioenergy Production and Nitrogen Removal in Northern Italy," Sustainability, MDPI, vol. 10(10), pages 1-18, October.
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    1. Alessandro Abbà & Marta Domini & Marco Baldi & Roberta Pedrazzani & Giorgio Bertanza, 2023. "Ammonia Recovery from Livestock Manure Digestate through an Air-Bubble Stripping Reactor: Evaluation of Performance and Energy Balance," Energies, MDPI, vol. 16(4), pages 1-15, February.
    2. Ester Scotto di Perta & Raffaele Grieco & Stefano Papirio & Giovanni Esposito & Elena Cervelli & Marco Bovo & Stefania Pindozzi, 2023. "Ammonia Air Stripping from Different Livestock Effluents Prior to and after Anaerobic Digestion," Sustainability, MDPI, vol. 15(12), pages 1-10, June.

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