Use of municipal solid wastes for chemical and microbiological recovery of soils contaminated with metal(loid)s

Garau, Giovanni; Silvetti, Margherita; Vasileiadis, Sotirios; Donner, Erica; Diquattro, Stefania; Deiana, S.; Lombi, Enzo; Castaldi, Paola

doi:10.1016/j.soilbio.2017.03.014

Cited by 49 publications

(64 citation statements)

References 62 publications

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“…This may be due to the combined effect MSWC addition and root activities, which could have enhanced the metabolism and the number of microorganisms, so increasing the DHG activities, in accordance with Garau et al ( 2011 , 2019a ) and Garcia et al ( 2002 ). In particular, compost DOC could have stimulated bacterial growth (and DGH activity) in amended soil as previously reported (Garau et al 2017 ). Moreover, the better plant growth in the amended soils was reasonably accompanied by a greater exudation of C compounds from roots which eventually determined an increase of DHG (Walker et al 2003 ).…”

Section: Resultssupporting

confidence: 79%

“…4b ). The MSWC addition, increasing the organic nitrogen content and the microbial population, could have favored a global increase of URE activity (Garau et al 2017 ; Guo et al 2019 ). As for DHG, the greater root exudation of C compounds in amended soils could have boosted soil microbial abundance and URE activity in such soils.…”

Section: Resultsmentioning

confidence: 99%

“…Mining activities usually release in the environment high amounts of potentially toxic elements (PTE) like Cd, Cu, Pb, Zn, As, and Sb, especially because of the absence of effective recovery and securing interventions. This in turn can produce severe and widespread pollution of soil and ground water in large areas or entire regions (Castaldi et al 2018 ; Cidu et al 2012 ; Garau et al 2017 ).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Cynara cardunculus L. and municipal solid waste compost for aided phytoremediation of multi potentially toxic element–contaminated soils

Garau

Castaldi

Patteri

et al. 2020

Environ Sci Pollut Res

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The suitability for aided phytoremediation of Cynara cardunculus L. var. altilis and municipal solid waste compost (MSWC) applied at 2% and 4 % rates was evaluated in a multi potentially toxic element (PTE)-contaminated mining soil (Pb ~ 15,383 mg kg−1, Zn ~ 4076 mg kg−1, As ~ 49 mg kg−1, Cd ~ 67 mg kg−1, Cu ~ 181 mg kg−1, and Sb ~ 109 mg kg−1). The growth of C. cardunculus significantly increased with compost amendment and followed the order: MSWC-4% > MSWC-2% > Control. PTE concentrations in the roots of plants grown on amended soils decreased compared with control plants (i.e., less than ~ 82, 94, and 88% for Pb, Zn, and Cd respectively). PTE translocation from roots to shoots depended on both PTE and amendment rate but values were generally low (i.e., < 1). However, PTE mineralomasses were always higher for plants grown on MSWC-amended soils because of their higher biomass production, which favored an overall PTE bioaccumulation in roots and shoots. After plant growth, labile As and Sb increased in amended soils, while labile Pb, Zn, Cu, and Cd significantly decreased. Likewise, dehydrogenase and urease activities increased significantly in planted soils amended with MSWC. Also, the potential metabolic activity and the catabolic versatility of soil microbial communities significantly increased in planted soils amended with MSWC. Overall, our results indicate that C. cardunculus and MSWC can be effective resources for the aided phytoremediation of multi PTE-contaminated soils.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Cynara cardunculus L. and municipal solid waste compost for aided phytoremediation of multi potentially toxic element–contaminated soils

Garau

Castaldi

Patteri

et al. 2020

Environ Sci Pollut Res

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“…However, landfill disposal is increasingly expensive and may be wasting a potentially useable material; an increasing array of potential beneficial uses of WTRs have been researched and demonstrated over the last two decades, including use in constructed reedbeds or as a soil amendment to manage phosphorus (P) mobility within catchments (Babatunde et al, 2011;Ippolito, 2015;Oliver et al, 2011), land application to increase organic matter and water holding capacity and related soil parameters (e.g. Ahmed et al, 1998;Bugbee and Frink, 1985), and most recently as a way of remediating polluted soils through immobilization of contaminants by WTRs (Garau et al, 2014;Garau et al, 2017;Wang et al, 2012). Beneficial use of WTRs is therefore an attractive option that offers financial advantages and facilitates development of a more circular economy with greater levels of materials recycling.…”

Section: Introductionmentioning

confidence: 99%

“…While a number of studies have investigated the effects on microbes following soil amendment with WTRs (e.g. Garau et al, 2017), very few, if any, have examined the influence of WTR application on earthworms. This is a major gap in current understanding of the risks and benefits of using these materials in agricultural soils, especially considering that earthworms are widely recognized as essential ecosystem engineers that provide a host of advantages for soil health and development (e.g.…”

Section: Introductionmentioning

confidence: 99%

Water treatment residuals as soil amendments: Examining element extractability, soil porewater concentrations and effects on earthworm behaviour and survival

Howells

Lewis

Beard

et al. 2018

Ecotoxicology and Environmental Safety

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Drinking water treatment residuals (WTRs), the by-product of water clarification processes, are routinely disposed of via landfill however there is a growing body of research that demonstrates the material has great potential for beneficial use in environmental applications. Application to agricultural land is one option showing great promise (i.e. a low cost disposal route that provides organic matter input to soils and other potential benefits), however questions remain as to the impact such applications may have on earthworm survival and behaviour and also on the potential effects it may have on soil porewater chemistry. This study examined the leachability of elements within two types of WTRs (one Al- and one Fe- based) from England via 0.001 M CaCl solution, at varying pH, and via the Community Bureau of Reference (BCR) sequential extraction scheme. Earthworm avoidance, survival, growth, reproduction and element concentrations were examined in WTR-amended sandy soils (0%, 5%, 10%, 20% w/w), while soil porewaters were also recovered from experimental units and examined for element concentrations. The results revealed leachable element concentrations to be very low in both types of WTRs tested and so element leaching from these WTRs would be unlikely to pose any threat to ecosystems under typical agricultural soil conditions. However, when the pH was lowered to 4.4 there was a substantial release of Al from the Al-WTRs (382 mg/kg). Soil porewater element concentrations were influenced to some degree by WTR addition, warranting further examination in terms of any potential implications for nutrient supply or limitation. Earthworm avoidance of WTR-amended soil was only observed for Al-WTRs and only at the maximum applied rate (20% w/w), while survival of earthworms was not affected by either WTR type at any application rate. Earthworm growth and reproduction (cocoon production) were not affected at a statistically significant level but this needs further examination over a longer period of exposure. Increased assimilation of Al and Fe into earthworm tissues was observed at some WTR application rates (maximum fresh weight concentrations of 42 mg/kg for Al and 167 mg/kg for Fe), but these were not at levels likely to pose environmental concerns.

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Effect of fertilization, carbon‐based material, and redmud amendments on the bacterial activity and diversity of a metal(loid) contaminated mining soil

et al. 2021

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Soil amendments can be used to improve phytoremediation of polluted soils. Little is known about the effects of single or combined amendment addition on the bacterial community. Two carbon-based amendments, a biochar and an activated carbon, and two redmuds were applied to a lead and arsenic contaminated mine spoil Technosol, alone or in combinations. The bacterial community was evaluated using enzyme activities, Biolog EcoPlates, and next-generation sequencing with reference to untreated soil and fertilized soil. Fertilization had a negative effect on the bacterial community diversity and activity. The two carbon-based materials decreased β-glucosidase activity but increased carbon-related activity (Biolog EcoPlates) while the two redmuds increased the overall activity of the bacterial community. The combination of biochar and redmud increased both the diversity and activity of the bacterial community. All treatments induced a shift in the bacterial community structure.The treatments containing the neutralized redmud and/or biochar clustered together, whereas the treatments with nonprocessed redmud and activated carbon were closer to nonamended soil, while the bacterial community of the fertilization treatment was different from it. Treatments with biochar and/or neutralized redmud resulted in a similar community composition while the bacterial community of the treatments with activated carbon and nonprocessed redmud remained more similar to that of the nonamended technosol.

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Use of municipal solid wastes for chemical and microbiological recovery of soils contaminated with metal(loid)s

Cited by 49 publications

References 62 publications

Evaluation of Cynara cardunculus L. and municipal solid waste compost for aided phytoremediation of multi potentially toxic element–contaminated soils

Evaluation of Cynara cardunculus L. and municipal solid waste compost for aided phytoremediation of multi potentially toxic element–contaminated soils

Water treatment residuals as soil amendments: Examining element extractability, soil porewater concentrations and effects on earthworm behaviour and survival

Effect of fertilization, carbon‐based material, and redmud amendments on the bacterial activity and diversity of a metal(loid) contaminated mining soil

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