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Sustainability 2018, 10(1), 277; https://doi.org/10.3390/su10010277

Recycling Pig Slurry Solid Fraction Compost as a Sound Absorber

Institute for Agricultural and Earth Moving Machines (IMAMOTER), Italian National Research Council (CNR), Strada delle Cacce, 73-10135 Torino (TO), Italy
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Received: 4 November 2017 / Revised: 14 December 2017 / Accepted: 15 January 2018 / Published: 22 January 2018
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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. View Full-Text
Keywords: composting process; pig manure; bulk density; durability; particle size; absorption coefficient composting process; pig manure; bulk density; durability; particle size; absorption coefficient
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Pampuro, N.; Preti, C.; Cavallo, E. Recycling Pig Slurry Solid Fraction Compost as a Sound Absorber. Sustainability 2018, 10, 277.

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