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Upcycling Phosphorus Recovered from Anaerobically Digested Dairy Manure to Support Production of Vegetables and Flowers

Author

Listed:
  • Katherine K. Porterfield

    (Rubenstein School of Environment and Natural Resources, University of Vermont, Burlington, VT 05405, USA)

  • Robert Joblin

    (Magic Dirt Horticultural Products, LLC, Little Rock, AR 72223, USA)

  • Deborah A. Neher

    (Department of Plant & Soil Science, University of Vermont, Burlington, VT 05405, USA
    Gund Institute for Environment, University of Vermont, Burlington, VT 05405, USA)

  • Michael Curtis

    (CDT Tech, Inc., Columbia, CT 06489, USA)

  • Steve Dvorak

    (DVO, Inc., Chilton, WI 53014, USA)

  • Donna M. Rizzo

    (Gund Institute for Environment, University of Vermont, Burlington, VT 05405, USA
    Department of Civil & Environmental Engineering, University of Vermont, Burlington, VT 05405, USA)

  • Joshua W. Faulkner

    (Department of Plant & Soil Science, University of Vermont, Burlington, VT 05405, USA
    Extension Center for Sustainable Agriculture, University of Vermont, Burlington, VT 05405, USA)

  • Eric D. Roy

    (Rubenstein School of Environment and Natural Resources, University of Vermont, Burlington, VT 05405, USA
    Gund Institute for Environment, University of Vermont, Burlington, VT 05405, USA)

Abstract

Dissolved air flotation (DAF) separates phosphorus (P)-rich fine solids from anaerobically digested dairy manure, creating opportunities to export surplus P to the marketplace as a bagged plant food product. Seedlings of tomato and marigold were amended at various volume per volume ( v/v ) ratios with plant foods consisting of fine solids upcycled (i.e., transformed into a higher quality product) by drying and blending with other organic residuals. A plate competition assay was conducted to assess the fine solids’ potential to suppress the plant pathogen Rhizoctonia solani . Plant foods were comprised of 2.0–2.1% N, 0.8–0.9% P and 0.6–0.8% K. Extractions indicated that plant foods contained a mixture of plant-available and slow-release P. At 6% v/v plant food, dry biomass of marigold and tomato were six-times greater than the unamended control and not significantly different from a market alternative treatment. Fine solids exhibited negligible potential to suppress R. solani . This study indicates that DAF-separated fine solids could be used to support horticulture, providing information for design of a circular economy approach to dairy manure nutrient management. Life cycle assessment and business model development for this nutrient recovery strategy are necessary next steps to further guide sustainability efforts.

Suggested Citation

  • Katherine K. Porterfield & Robert Joblin & Deborah A. Neher & Michael Curtis & Steve Dvorak & Donna M. Rizzo & Joshua W. Faulkner & Eric D. Roy, 2020. "Upcycling Phosphorus Recovered from Anaerobically Digested Dairy Manure to Support Production of Vegetables and Flowers," Sustainability, MDPI, vol. 12(3), pages 1-14, February.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:3:p:1139-:d:316906
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    References listed on IDEAS

    as
    1. Claudia Maurer & Joachim Müller, 2019. "Drying Characteristics of Biogas Digestate in a Hybrid Waste-Heat/Solar Dryer," Energies, MDPI, vol. 12(7), pages 1-9, April.
    2. Zong Liu & Julie Howe & Xiao Wang & Xiao Liang & Troy Runge, 2019. "Use of Dry Dairy Manure Pellets as Nutrient Source for Tomato ( Solanum lycopersicum var. cerasiforme ) Growth in Soilless Media," Sustainability, MDPI, vol. 11(3), pages 1-12, February.
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    Cited by:

    1. Camila Ester Hollas & Alice Chiapetti Bolsan & Bruno Venturin & Gabriela Bonassa & Deisi Cristina Tápparo & Daniela Cândido & Fabiane Goldschmidt Antes & Matias B. Vanotti & Ariel A. Szögi & Airton Ku, 2021. "Second-Generation Phosphorus: Recovery from Wastes towards the Sustainability of Production Chains," Sustainability, MDPI, vol. 13(11), pages 1-30, May.

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