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Food Waste-Assisted Metal Extraction from Printed Circuit Boards: The Aspergillus niger Route

A low-energy paradigm was adopted for sustainable, affordable, and effective urban waste valorization. Here a new, eco-designed, solid-state fermentation process is presented to obtain some useful bio-products by recycling of different wastes. Urban food waste and scraps from trimmings were used as...

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Autores principales: Alias, Carlotta, Bulgari, Daniela, Bilo, Fabjola, Borgese, Laura, Gianoncelli, Alessandra, Ribaudo, Giovanni, Gobbi, Emanuela, Alessandri, Ivano
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8143491/
https://www.ncbi.nlm.nih.gov/pubmed/33922043
http://dx.doi.org/10.3390/microorganisms9050895
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author Alias, Carlotta
Bulgari, Daniela
Bilo, Fabjola
Borgese, Laura
Gianoncelli, Alessandra
Ribaudo, Giovanni
Gobbi, Emanuela
Alessandri, Ivano
author_facet Alias, Carlotta
Bulgari, Daniela
Bilo, Fabjola
Borgese, Laura
Gianoncelli, Alessandra
Ribaudo, Giovanni
Gobbi, Emanuela
Alessandri, Ivano
author_sort Alias, Carlotta
collection PubMed
description A low-energy paradigm was adopted for sustainable, affordable, and effective urban waste valorization. Here a new, eco-designed, solid-state fermentation process is presented to obtain some useful bio-products by recycling of different wastes. Urban food waste and scraps from trimmings were used as a substrate for the production of citric acid (CA) by solid state fermentation of Aspergillus niger NRRL 334, with a yield of 20.50 mg of CA per gram of substrate. The acid solution was used to extract metals from waste printed circuit boards (WPCBs), one of the most common electronic waste. The leaching activity of the biological solution is comparable to a commercial CA one. Sn and Fe were the most leached metals (404.09 and 67.99 mg/L, respectively), followed by Ni and Zn (4.55 and 1.92 mg/L) without any pre-treatments as usually performed. Commercial CA extracted Fe more efficiently than the organic one (123.46 vs. 67.99 mg/L); vice versa, biological organic CA recovered Ni better than commercial CA (4.55 vs. 1.54 mg/L). This is the first approach that allows the extraction of metals from WPCBs through CA produced by A. niger directly grown on waste material without any sugar supplement. This “green” process could be an alternative for the recovery of valuable metals such as Fe, Pb, and Ni from electronic waste.
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spelling pubmed-81434912021-05-25 Food Waste-Assisted Metal Extraction from Printed Circuit Boards: The Aspergillus niger Route Alias, Carlotta Bulgari, Daniela Bilo, Fabjola Borgese, Laura Gianoncelli, Alessandra Ribaudo, Giovanni Gobbi, Emanuela Alessandri, Ivano Microorganisms Article A low-energy paradigm was adopted for sustainable, affordable, and effective urban waste valorization. Here a new, eco-designed, solid-state fermentation process is presented to obtain some useful bio-products by recycling of different wastes. Urban food waste and scraps from trimmings were used as a substrate for the production of citric acid (CA) by solid state fermentation of Aspergillus niger NRRL 334, with a yield of 20.50 mg of CA per gram of substrate. The acid solution was used to extract metals from waste printed circuit boards (WPCBs), one of the most common electronic waste. The leaching activity of the biological solution is comparable to a commercial CA one. Sn and Fe were the most leached metals (404.09 and 67.99 mg/L, respectively), followed by Ni and Zn (4.55 and 1.92 mg/L) without any pre-treatments as usually performed. Commercial CA extracted Fe more efficiently than the organic one (123.46 vs. 67.99 mg/L); vice versa, biological organic CA recovered Ni better than commercial CA (4.55 vs. 1.54 mg/L). This is the first approach that allows the extraction of metals from WPCBs through CA produced by A. niger directly grown on waste material without any sugar supplement. This “green” process could be an alternative for the recovery of valuable metals such as Fe, Pb, and Ni from electronic waste. MDPI 2021-04-22 /pmc/articles/PMC8143491/ /pubmed/33922043 http://dx.doi.org/10.3390/microorganisms9050895 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Alias, Carlotta
Bulgari, Daniela
Bilo, Fabjola
Borgese, Laura
Gianoncelli, Alessandra
Ribaudo, Giovanni
Gobbi, Emanuela
Alessandri, Ivano
Food Waste-Assisted Metal Extraction from Printed Circuit Boards: The Aspergillus niger Route
title Food Waste-Assisted Metal Extraction from Printed Circuit Boards: The Aspergillus niger Route
title_full Food Waste-Assisted Metal Extraction from Printed Circuit Boards: The Aspergillus niger Route
title_fullStr Food Waste-Assisted Metal Extraction from Printed Circuit Boards: The Aspergillus niger Route
title_full_unstemmed Food Waste-Assisted Metal Extraction from Printed Circuit Boards: The Aspergillus niger Route
title_short Food Waste-Assisted Metal Extraction from Printed Circuit Boards: The Aspergillus niger Route
title_sort food waste-assisted metal extraction from printed circuit boards: the aspergillus niger route
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8143491/
https://www.ncbi.nlm.nih.gov/pubmed/33922043
http://dx.doi.org/10.3390/microorganisms9050895
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