Application of different alkaline materials as polluted soil amendments: A comparative assessment of their impact on trace element mobility and microbial functions

Treatment with chemical amendments is among the best techniques to remediate soils highly polluted with trace elements. The use of waste-derived products has several advantages in this regard, mainly in terms of reducing process costs and conserving natural resources. In this study, the performance...

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Autores principales:	E. Álvarez-Ayuso, P. Abad-Valle
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Coal combustion fly ashes Zeolite NaP1 Aluminum salt slags Calcite Polluted soil stabilization Soil enzymatic activities Environmental pollution TD172-193.5 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/51c47ec45fec423fb0e21064d2b04a06
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spelling	oai:doaj.org-article:51c47ec45fec423fb0e21064d2b04a062021-11-06T04:17:52ZApplication of different alkaline materials as polluted soil amendments: A comparative assessment of their impact on trace element mobility and microbial functions0147-651310.1016/j.ecoenv.2021.112927https://doaj.org/article/51c47ec45fec423fb0e21064d2b04a062021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0147651321010393https://doaj.org/toc/0147-6513Treatment with chemical amendments is among the best techniques to remediate soils highly polluted with trace elements. The use of waste-derived products has several advantages in this regard, mainly in terms of reducing process costs and conserving natural resources. In this study, the performance of the synthetic zeolite NaP1 derived from coal combustion fly ash (SZ) and the by-product generated from the processing of aluminum salt slags (BP) was evaluated with this aim in comparison to calcite (CC). For this purpose, mine soils polluted with Zn, Cd, and Pb were amended under controlled laboratory conditions with different doses (0%, 1%, 2%, 5%, and 10%) of SZ, BP, or CC, and their impact on trace element mobility and microbial functions was evaluated. Specifically, the mobile and mobilizable trace element pools, basal soil respiration, and different enzyme activities were analyzed. Both SZ and BP performed better than CC in the immobilization of trace elements, reaching, respectively, mobility decreases up to 89–94% and 66–87% when applied at a dose of 10%. These amendments reduced the mobile trace element pool by precipitating them as acid-soluble precipitates and/or retaining them in the reducible fraction of soils. The alkaline nature of these materials and the concomitant increase in soil pH caused by their application mainly accounted for this behavior. Additionally, soil microbial functionality improved after amendment, especially in the case of SZ, as shown by dehydrogenase and alkaline phosphatase activities, which significantly increased (p < 0.05) up to 536% and 48%, respectively. Therefore, applying SZ or BP as soil amendments can significantly decrease the mobile trace element contents of heavily polluted soils without negatively affecting soil quality, thus facilitating plant growth to revegetate and reclaim degraded spaces.E. Álvarez-AyusoP. Abad-ValleElsevierarticleCoal combustion fly ashesZeolite NaP1Aluminum salt slagsCalcitePolluted soil stabilizationSoil enzymatic activitiesEnvironmental pollutionTD172-193.5Environmental sciencesGE1-350ENEcotoxicology and Environmental Safety, Vol 227, Iss , Pp 112927- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Coal combustion fly ashes Zeolite NaP1 Aluminum salt slags Calcite Polluted soil stabilization Soil enzymatic activities Environmental pollution TD172-193.5 Environmental sciences GE1-350
spellingShingle	Coal combustion fly ashes Zeolite NaP1 Aluminum salt slags Calcite Polluted soil stabilization Soil enzymatic activities Environmental pollution TD172-193.5 Environmental sciences GE1-350 E. Álvarez-Ayuso P. Abad-Valle Application of different alkaline materials as polluted soil amendments: A comparative assessment of their impact on trace element mobility and microbial functions
description	Treatment with chemical amendments is among the best techniques to remediate soils highly polluted with trace elements. The use of waste-derived products has several advantages in this regard, mainly in terms of reducing process costs and conserving natural resources. In this study, the performance of the synthetic zeolite NaP1 derived from coal combustion fly ash (SZ) and the by-product generated from the processing of aluminum salt slags (BP) was evaluated with this aim in comparison to calcite (CC). For this purpose, mine soils polluted with Zn, Cd, and Pb were amended under controlled laboratory conditions with different doses (0%, 1%, 2%, 5%, and 10%) of SZ, BP, or CC, and their impact on trace element mobility and microbial functions was evaluated. Specifically, the mobile and mobilizable trace element pools, basal soil respiration, and different enzyme activities were analyzed. Both SZ and BP performed better than CC in the immobilization of trace elements, reaching, respectively, mobility decreases up to 89–94% and 66–87% when applied at a dose of 10%. These amendments reduced the mobile trace element pool by precipitating them as acid-soluble precipitates and/or retaining them in the reducible fraction of soils. The alkaline nature of these materials and the concomitant increase in soil pH caused by their application mainly accounted for this behavior. Additionally, soil microbial functionality improved after amendment, especially in the case of SZ, as shown by dehydrogenase and alkaline phosphatase activities, which significantly increased (p < 0.05) up to 536% and 48%, respectively. Therefore, applying SZ or BP as soil amendments can significantly decrease the mobile trace element contents of heavily polluted soils without negatively affecting soil quality, thus facilitating plant growth to revegetate and reclaim degraded spaces.
format	article
author	E. Álvarez-Ayuso P. Abad-Valle
author_facet	E. Álvarez-Ayuso P. Abad-Valle
author_sort	E. Álvarez-Ayuso
title	Application of different alkaline materials as polluted soil amendments: A comparative assessment of their impact on trace element mobility and microbial functions
title_short	Application of different alkaline materials as polluted soil amendments: A comparative assessment of their impact on trace element mobility and microbial functions
title_full	Application of different alkaline materials as polluted soil amendments: A comparative assessment of their impact on trace element mobility and microbial functions
title_fullStr	Application of different alkaline materials as polluted soil amendments: A comparative assessment of their impact on trace element mobility and microbial functions
title_full_unstemmed	Application of different alkaline materials as polluted soil amendments: A comparative assessment of their impact on trace element mobility and microbial functions
title_sort	application of different alkaline materials as polluted soil amendments: a comparative assessment of their impact on trace element mobility and microbial functions
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/51c47ec45fec423fb0e21064d2b04a06
work_keys_str_mv	AT ealvarezayuso applicationofdifferentalkalinematerialsaspollutedsoilamendmentsacomparativeassessmentoftheirimpactontraceelementmobilityandmicrobialfunctions AT pabadvalle applicationofdifferentalkalinematerialsaspollutedsoilamendmentsacomparativeassessmentoftheirimpactontraceelementmobilityandmicrobialfunctions
_version_	1718443915622744064

Application of different alkaline materials as polluted soil amendments: A comparative assessment of their impact on trace element mobility and microbial functions

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