Cargando…

Improved remediation of co-contaminated soils by heavy metals and PAHs with biosurfactant-enhanced soil washing

Due to the huge toxicity of co-contaminated soil with PAHs and heavy metals and the complexity of their remediation, it is thus critical to take effective remediation actions to remove heavy metals and PAHs simultaneously from the co-contaminated soil. Biosurfactant-enhanced soil washing (BESW) were...

Descripción completa

Detalles Bibliográficos
Autores principales: Zhang, Xu, Zhang, Xiaodong, Wang, Shuguang, Zhao, Shan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8904480/
https://www.ncbi.nlm.nih.gov/pubmed/35260619
http://dx.doi.org/10.1038/s41598-022-07577-7
_version_ 1784664960026017792
author Zhang, Xu
Zhang, Xiaodong
Wang, Shuguang
Zhao, Shan
author_facet Zhang, Xu
Zhang, Xiaodong
Wang, Shuguang
Zhao, Shan
author_sort Zhang, Xu
collection PubMed
description Due to the huge toxicity of co-contaminated soil with PAHs and heavy metals and the complexity of their remediation, it is thus critical to take effective remediation actions to remove heavy metals and PAHs simultaneously from the co-contaminated soil. Biosurfactant-enhanced soil washing (BESW) were investigated in this study for remediation of soil co-contaminated with phenanthrene (PHE) and cadmium (Cd). The co-existence of PHE and Cd caused the change of the structure of soil and rhamnolipid micelle, which lead to different removal rate of PHE and Cd from co-contaminated soil compared with single contaminated soil. The results of FT-IR and NMR showed that PHE entered micelles of rhamnolipid and Cd formed the complexation with the external carboxyl groups of rhamnolipid micelle. We also found that pH, concentration of rhamnolipid solution, temperature and ionic strength had influence on co-contaminated soil remediation. The effects of above mentioned four factors on co-contaminated soil remediation in BESW processes were analyzed by using Taguchi design of experiment method. Taguchi based Grey Relational Analysis was conducted to identify the optimal remediation conditions, which included pH = 9, concentration of rhamnolipid = 5 g/L, temperature = 15 °C and ionic strength = 0.01 M. Under the optimal conditions for BESW, removal rates of cadmium and phenanthrene reached 72.4% and 87.8%, respectively in co-contaminated soil.
format Online
Article
Text
id pubmed-8904480
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-89044802022-03-09 Improved remediation of co-contaminated soils by heavy metals and PAHs with biosurfactant-enhanced soil washing Zhang, Xu Zhang, Xiaodong Wang, Shuguang Zhao, Shan Sci Rep Article Due to the huge toxicity of co-contaminated soil with PAHs and heavy metals and the complexity of their remediation, it is thus critical to take effective remediation actions to remove heavy metals and PAHs simultaneously from the co-contaminated soil. Biosurfactant-enhanced soil washing (BESW) were investigated in this study for remediation of soil co-contaminated with phenanthrene (PHE) and cadmium (Cd). The co-existence of PHE and Cd caused the change of the structure of soil and rhamnolipid micelle, which lead to different removal rate of PHE and Cd from co-contaminated soil compared with single contaminated soil. The results of FT-IR and NMR showed that PHE entered micelles of rhamnolipid and Cd formed the complexation with the external carboxyl groups of rhamnolipid micelle. We also found that pH, concentration of rhamnolipid solution, temperature and ionic strength had influence on co-contaminated soil remediation. The effects of above mentioned four factors on co-contaminated soil remediation in BESW processes were analyzed by using Taguchi design of experiment method. Taguchi based Grey Relational Analysis was conducted to identify the optimal remediation conditions, which included pH = 9, concentration of rhamnolipid = 5 g/L, temperature = 15 °C and ionic strength = 0.01 M. Under the optimal conditions for BESW, removal rates of cadmium and phenanthrene reached 72.4% and 87.8%, respectively in co-contaminated soil. Nature Publishing Group UK 2022-03-08 /pmc/articles/PMC8904480/ /pubmed/35260619 http://dx.doi.org/10.1038/s41598-022-07577-7 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Zhang, Xu
Zhang, Xiaodong
Wang, Shuguang
Zhao, Shan
Improved remediation of co-contaminated soils by heavy metals and PAHs with biosurfactant-enhanced soil washing
title Improved remediation of co-contaminated soils by heavy metals and PAHs with biosurfactant-enhanced soil washing
title_full Improved remediation of co-contaminated soils by heavy metals and PAHs with biosurfactant-enhanced soil washing
title_fullStr Improved remediation of co-contaminated soils by heavy metals and PAHs with biosurfactant-enhanced soil washing
title_full_unstemmed Improved remediation of co-contaminated soils by heavy metals and PAHs with biosurfactant-enhanced soil washing
title_short Improved remediation of co-contaminated soils by heavy metals and PAHs with biosurfactant-enhanced soil washing
title_sort improved remediation of co-contaminated soils by heavy metals and pahs with biosurfactant-enhanced soil washing
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8904480/
https://www.ncbi.nlm.nih.gov/pubmed/35260619
http://dx.doi.org/10.1038/s41598-022-07577-7
work_keys_str_mv AT zhangxu improvedremediationofcocontaminatedsoilsbyheavymetalsandpahswithbiosurfactantenhancedsoilwashing
AT zhangxiaodong improvedremediationofcocontaminatedsoilsbyheavymetalsandpahswithbiosurfactantenhancedsoilwashing
AT wangshuguang improvedremediationofcocontaminatedsoilsbyheavymetalsandpahswithbiosurfactantenhancedsoilwashing
AT zhaoshan improvedremediationofcocontaminatedsoilsbyheavymetalsandpahswithbiosurfactantenhancedsoilwashing