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Perspectives of Using Lignin as Additive to Improve the Permeability of In-Situ Soils for Barrier Materials in Landfills

Author

Listed:
  • Lucio Di Matteo

    (Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, Via Pascoli s.n.c., 06123 Perugia, Italy)

  • Lorenzo Bulletti

    (Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, Via Pascoli s.n.c., 06123 Perugia, Italy)

  • Eliana Capecchi

    (Dipartimento di Scienze Ecologiche e Biologiche, Università degli Studi della Tuscia, Largo Università, 01100 Viterbo, Italy)

  • Antonio La Viola

    (Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, Via Pascoli s.n.c., 06123 Perugia, Italy)

  • Davide Piccinino

    (Dipartimento di Scienze Ecologiche e Biologiche, Università degli Studi della Tuscia, Largo Università, 01100 Viterbo, Italy)

  • Vincenzo Piscopo

    (Dipartimento di Scienze Ecologiche e Biologiche, Università degli Studi della Tuscia, Largo Università, 01100 Viterbo, Italy)

Abstract

Very often, in-situ soil does not meet the requirements for landfill barriers; therefore, it is necessary to purchase the material from quarries. An increasing number of by-products have been proposed as alternative landfill barrier materials. The present study investigated the performance of two soils of Central Italy (alluvial and volcanic soils) with an organosolv lignin (sulfur-free lignin (SFL)), a widespread by-product in the world. Laboratory investigations indicated that the volcanic soil mixed with 10% in weight of lignin did not reach the permeability value required for landfill bottom liners, also showing high compressibility. On the contrary, the addition of 20% to 30% lignin to the alluvial soil reached the permeability value recommended for the top-sealing layer of landfills: scanning electron microscope analysis indicated that the improvement was due mainly to the physical binding. Large-scale investigations should be carried out to evaluate the long-term performance of the mixtures. The increasing production of organosolv lignin worldwide gives this by-product the opportunity to be used as an additive for the realization of the top-sealing layer. The approach can save the consumption of raw materials (clayey soils from quarries), giving lignin a potential new field of application and recovering in-situ soils.

Suggested Citation

  • Lucio Di Matteo & Lorenzo Bulletti & Eliana Capecchi & Antonio La Viola & Davide Piccinino & Vincenzo Piscopo, 2020. "Perspectives of Using Lignin as Additive to Improve the Permeability of In-Situ Soils for Barrier Materials in Landfills," Sustainability, MDPI, vol. 12(12), pages 1-14, June.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:12:p:5197-:d:376348
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    References listed on IDEAS

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    1. Marc A. Rosen, 2012. "Engineering Sustainability: A Technical Approach to Sustainability," Sustainability, MDPI, vol. 4(9), pages 1-23, September.
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