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Title: Enhancing the Strength of Mine Residue Soil by Bioremediation Combined with Biopolymers
Authors: Correia, António A. S. 
Caldeira, Joana B. 
Branco, Rita 
Morais, Paula V. 
Keywords: biopolymer; biostimulation; bioaugmentation; xanthan gum; carboxymethyl cellulose; unconfined compressive strength (UCS) test; stress-strain
Issue Date: 2023
Publisher: MDPI
Project: This research was funded by FEDER funds through the program COMPETE—Programa Operacional Factores de Competitividade and by national funds through FCT—Fundação para a Ciência e Tecnologia, under the projects UID/EMS/00285/2020, UIDB/00102/2020, and LA/P/0112/2020, by the Project ERA-MIN-2019_67-Reviving and by BIORECOVER Horizon2020 under grant agreement No 821096, supported under Horizon 2020 the European Union’s Framework for Research and Innovation. Joana B. Caldeira was supported by a PhD research grant (2022.13542.BD) from FCT/MCTES through national funds. 
Serial title, monograph or event: Applied Sciences (Switzerland)
Volume: 13
Issue: 18
Abstract: Traditional soil stabilization methods are usually associated with high energy consumption, carbon emissions, and long-term environmental impact. Recent developments have shown the potential use of bio-based techniques as eco-friendly alternatives for soil stabilization. The present work studies the effects of the addition of the biopolymers xanthan gum (XG) or carboxymethyl cellulose (CMC) to a mine residue soil, combined or not with biostimulation and bioaugmentation techniques, in terms of compressive stress–strain behavior. Unconfined compressive strength (UCS) tests were performed on previously disturbed samples (two cycles of percolation, extraction and homogenization) to evaluate if the biostimulation and bioremediation remain active in a real adverse scenario. The results allowed for us to conclude that both biopolymers, when applied individually (with a content of 1%), are effective stabilizers (CMC allows for unconfined compressive strength increases of up to 109%), showing better results for CMC than Portland cement. The biostimulation of the autochthonous community of the mine residue soil was revealed to be a non-effective technique, even when combined with the biopolymers. However, good results were observed when the bioaugmentation was combined with xanthan gum, with unconfined compressive strength improvements of up to 27%. The study revealed that these bio-based techniques are promising soil engineering techniques, offering environmentally friendly alternatives for sustainable soil stabilization and contributing to a greener and more sustainable future.
ISSN: 2076-3417
DOI: 10.3390/app131810550
Rights: openAccess
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais
FCTUC Eng.Mecânica - Artigos em Revistas Internacionais
I&D CEMMPRE - Artigos em Revistas Internacionais
I&D CIEPQPF - Artigos em Revistas Internacionais

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