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Recycling Pig Slurry Solid Fraction Compost as a Sound Absorber

Author

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  • Niccolò Pampuro

    (Institute for Agricultural and Earth Moving Machines (IMAMOTER), Italian National Research Council (CNR), Strada delle Cacce, 73-10135 Torino (TO), Italy)

  • Christian Preti

    (Institute for Agricultural and Earth Moving Machines (IMAMOTER), Italian National Research Council (CNR), Strada delle Cacce, 73-10135 Torino (TO), Italy)

  • Eugenio Cavallo

    (Institute for Agricultural and Earth Moving Machines (IMAMOTER), Italian National Research Council (CNR), Strada delle Cacce, 73-10135 Torino (TO), Italy)

Abstract

The aim of this investigation was to determine the physical and acoustical properties of compacts made from composted pig slurry solid fraction (SF) in order to assess the potential to recycle this agricultural waste as a sound absorber. The compacts were obtained by compression. The physical parameters investigated were bulk density, durability, and particle size distribution. The acoustical features of the compacts were studied with an impedance tube device in order to verify the acoustic absorption coefficient. Two composts were prepared: pig SF compost without a bulking agent (SSFC) and pig SF compost with wood chips as a bulking agent (WCC). The study’s results indicated that compost particles dimension played a key role in the physical and acoustical properties of the compacts: the smaller the particles, the higher the physical and acoustical properties of the compacts. The densification process increased the bulk density of the investigated composts up to 690 kg m −3 for SSFC and 660 kg m −3 for WWC, with, respectively, medium (77.9%) and low (66.5%) durability. The addition of woody bulking agent significantly reduced the absorption coefficient: the best results, in terms of potential use as a sound absorber, were observed for compacts made from composted pig slurry solid fraction without the addition of wood chips.

Suggested Citation

  • Niccolò Pampuro & Christian Preti & Eugenio Cavallo, 2018. "Recycling Pig Slurry Solid Fraction Compost as a Sound Absorber," Sustainability, MDPI, vol. 10(1), pages 1-13, January.
    • Handle: RePEc:gam:jsusta:v:10:y:2018:i:1:p:277-:d:128086
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    References listed on IDEAS

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    1. Niccolò Pampuro & Patrizia Busato & Eugenio Cavallo, 2018. "Gaseous Emissions after Soil Application of Pellet Made from Composted Pig Slurry Solid Fraction: Effect of Application Method and Pellet Diameter," Agriculture, MDPI, vol. 8(8), pages 1-11, August.
    2. Sandile Birthwell Ndwandwe & Ruey-Chee Weng, 2018. "Competitive Analyses of the Pig Industry in Swaziland," Sustainability, MDPI, vol. 10(12), pages 1-22, November.
    3. Niccolò Pampuro & Federica Caffaro & Eugenio Cavallo, 2018. "Reuse of Animal Manure: A Case Study on Stakeholders’ Perceptions about Pelletized Compost in Northwestern Italy," Sustainability, MDPI, vol. 10(6), pages 1-10, June.
    4. Niccolò Pampuro & Patrizia Busato & Eugenio Cavallo, 2018. "Effect of Densification Conditions on Specific Energy Requirements and Physical Properties of Compacts Made from Hop Cone," Energies, MDPI, vol. 11(9), pages 1-10, September.
    5. Davide Assandri & Niccolò Pampuro & Giacomo Zara & Eugenio Cavallo & Marilena Budroni, 2020. "Suitability of Composting Process for the Disposal and Valorization of Brewer’s Spent Grain," Agriculture, MDPI, vol. 11(1), pages 1-12, December.

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