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.com
Volume 6
Research & Reviews: Journal of Material Sciences
MatSciEngg 2018
October 15-17, 2018
October 15-17, 2018 Helsinki, Finland
31
st
Materials Science and Engineering
Conference: Advancement & Innovations
Superheated water hydrolysis of waste wool to obtain organic nitrogen fertilizers
Marina Zoccola
1
, Raffaella Mossotti
1
, Alessio Montarsolo
1
, Alessia Patrucco
1
, Rosalinda Caringella
1
, Pier Davide Pozzo
1
, Claudio Tonin
1
and Parag
Bhavsar
2
1
ISMAC-CNR, Italy
2
Polytechnic University of Turin, Italy
A
large amount of coarse wool, practically unserviceable for textile use, is generated in Europe from sheep shearing and
butchery. Such a byproduct is dumped, burned or sent to landfill. Following the European Commission regulations on
animal byproduct control, unserviceable raw wool is classified as category 3 special waste materials. The collection, storage,
transport, treatment, use and disposal of such unserviceable raw wool are subject to European Union regulations because of a
potential risk to human and animal health. This study aims at converting the waste wool into nitrogen fertilizers at a commercial
scale for grassland management and cultivation purposes. The chemical transformation of waste wool in to fertilizer is based
on a green economically sustainable hydrolysis treatment using superheated water. The experiments were carried out in a
semi-industrial reactor feeding superheated water. The wool/superheated water system was maintained for different reaction
times. The optimal conditions for this treatment were as follows: 170 °C for 60 minutes with a solid to liquor ratio close
to 1. The hydrolyzed product was analyzed using amino acid analysis and molecular weight distribution. Both the amino
acid and molecular weight distribution analysis revealed that the wool was completely degraded and the hydrolyzed product
contains a low molecular weight proteins and amino acids. Several hydrolyzed product obtained at different conditions were
tested for germination which showed a germination index higher than 100% without collateral phytotoxicity. The presence of
amino acids, primary nutrients and micronutrients in wool hydrolyzates, along with a concentration of heavy metals below the
standard limit confirms the possibility of using wool hydrolyzates as nitrogen based ecologically sound fertilizer.
Biography
Marina Zoccola has been working since 1989 as a Researcher at the National Research Council, Institute for Macromolecular Studies, textile section of Biella. Her
principal interests are in the study and characterization of biopolymers, mainly structural proteins (wool, fine animal fibers, silk, human hair). She has participated
in national and international research projects in the textile and biopolymer field. She is the author of over 30 scientific works published in international journals.
m.zoccola@bi.ismac.cnr.itMarina Zoccola et al., Res. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C5-026