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Emma Fernández Covelo - One of the best experts on this subject based on the ideXlab platform.
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contribution of waste and biochar amendment to the sorption of metals in a copper Mine Tailing
Catena, 2016Co-Authors: Rubén Forján, Veronica Asensio, Alfonso Rodriguezvila, Emma Fernández CoveloAbstract:Abstract One technique applied to restore degraded or contaminated soils is to use amendments made of different types of waste materials, which in turn may contain metals such as Cu, Pb and Zn. For this reason it is important to deterMine the capacity of the soil to retain these materials, and to compare the sorption capacity between an amended soil and another unamended soil. The aim of this study was to deterMine the chemical behaviour of these metals in the soil after applying the amendment, and how it affected the soil's sorption capacity. Another aim was to study the contribution of contaminating elements from the amendment itself. The amendments used in this study were a mixture made of waste material (sewage sludges, sludges from an aluminium plant, ash, food industry wastes, and sands from a wastewater treatment plant) and biochar (biomass of Acacia dealbata ) (97%:3%) in different soil/amendment proportions. The soil was from a Mine Tailing. The Mine Tailings were amended with the mixture of waste and biochar which had a higher sorption capacity than the soil from the pond. The samples with amendment had a greater affinity for Cu, Pb and Zn than the Mine soil. The results obtained show that adding a mixture made of waste and biochar favours the retention of Cu, Pb and Zn in Mine Tailing from metal Mines.
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Contributions of a compost-biochar mixture to the metal sorption capacity of a Mine Tailing
Environmental Science and Pollution Research, 2015Co-Authors: Rubén Forján, Veronica Asensio, Alfonso Rodríguez-vila, Emma Fernández CoveloAbstract:One technique applied to restore degraded or contaminated soils is to use amendments made of different types of waste materials, which in turn may contain metals such as Cu, Pb and Zn. For this reason, it is important to deterMine the capacity of the soil to retain these materials, and to compare the sorption capacity between an amended soil and another unamended soil. The aim of this study was to deterMine the mobility and availability of these metals in the soil after applying the amendment, and how it affected the soil’s sorption capacity. Sorption isotherms were compared with the empirical models of Langmuir and Freundlich to estimate the sorption capacity. The overall capacity of the soils to sorb Cu, Pb or Zn was evaluated as the slope Kr. The amendments used in this study were a mixture made of compost and biochar in different proportions (20, 40, 60, 100 %), which were applied to the Mine Tailing from a settling pond from a copper Mine. The Mine Tailing that were amended with the mixture of compost and biochar had a higher sorption capacity than the Mine Tailing from the unamended pond, and their sorption isotherms had a greater affinity towards Cu, Pb and Zn than the Mine Tailing that was studied. Therefore, the results obtained show that adding a mixture of compost and biochar favours the retention of Cu, Pb and Zn in Mine Tailing.
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Changes in the Phytoavailability of Nutrients in Mine Soils after Planting Trees and Amending with Wastes
Water Air and Soil Pollution, 2014Co-Authors: Veronica Asensio, Flora A. Vega, Emma Fernández CoveloAbstract:The purpose of the present study was to evaluate the effect of planting trees (Pinus pinaster or Eucalyptus globulus) and amending with wastes (sewage sludges and paper mill residues) on the nutrient content of Mine soils and under field conditions. The studied soils were located in a settling pond and a Mine Tailing within a former copper Mine. The soil samples were analyzed for several physico-chemical characteristics and the concentration of nutrients. The untreated settling pond soil had levels of N and K adequate only for the growth of eucalyptuses and pines, and moreover, the concentration of Ca and P were undetectable. The untreated Mine Tailing soil presented the same condition, also with adequate levels of Ca and Mg for eucalyptuses and pines. Planting these trees increased the concentration of Mg in the settling pond up to adequate levels only for such trees. Amending with wastes increased the phytoavailable concentration of all nutrients up to adequate levels for most plant species. In conclusion, it is recommended to amend Mine soils with wastes rich in nutrients and re-amend after some time because they raise them up to adequate levels for most plants but are depleted over time. It is possible to increase the concentration of all nutrients in Mine soils by adding organic wastes, even to values adequate for most plant species.
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soil management of copper Mine Tailing soils sludge amendment and tree vegetation could improve biological soil quality
Science of The Total Environment, 2013Co-Authors: Veronica Asensio, Emma Fernández Covelo, Ellen KandelerAbstract:Mine soils at the depleted copper Mine in Touro (Northwest Spain) are physico-chemically degraded and polluted by chromium and copper. To increase the quality of these soils, some areas at this Mine have been vegetated with eucalyptus or pines, amended with sludges, or received both treatments. Four sites were selected at the Touro Mine Tailing in order to evaluate the effect of these different reclamation treatments on the biological soil quality: (1) Control (untreated), (2) Forest (vegetated), (3) Sludge (amended with sludges) and (4) Forest + Sludge (vegetated and amended). The new approach of the present work is that we evaluated the effect of planting trees or/and amending with sludges on the biological soil quality of Mine sites polluted by metals under field conditions. The addition of sludges to Mine sites recovered the biological quality of the soil, while vegetating with trees did not increase microbial biomass and function to the level of unpolluted sites. Moreover, amending with sludges increased the efficiency of the soil's microbial community to metabolize C and N, which was indicated by the decrease of the specific enzyme activities and the increase in the ratio Cmic:Nmic (shift towards predominance of fungi instead of bacteria). However, the high Cu and Cr concentrations still have negative influence on the microorganisms in all the treated soils. For the future remediation of Mine soils, we recommend periodically adding sludge and planting native legume species.
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technosols made of wastes to improve physico chemical characteristics of a copper Mine soil
Pedosphere, 2013Co-Authors: Veronica Asensio, F A Vega, M.l. Andrade, Emma Fernández CoveloAbstract:Mine Tailing soils created from the copper extraction in Touro Mine (Northwest Spain) are very degraded both physically and chemically. Three plots in this Mine Tailing were amended with Technosols in different proportions in each one to know if this mixture improved the physico-chemical characteristics of the Mine soil and contaminated it with heavy metals. The Technosols were made of organic wastes, including mussel residues, wood fragments, sewage sludges and paper mill ashes. An unamended area was used as a control soil. Pseudototal and diethylenetriaMinepentaacetic acid (DTPA)-extractable contents of Al, Cr, Cu, Fe, Mn, Ni, Pb and Zn were deterMined in soil samples. The untreated soil had significant limitations for vegetation growth. All the Technosols improved the properties of the Mine soil by increasing organic carbon and pH value, but they added Ni, Pb or Zn to the soil. It is advisable to check whether the heavy metal concentrations of the wastes are hazardous or not before adding to soils. It is also necessary to study the effect of these wastes over time and in more areas to conclude if they are actually favourable to restore degraded Mine soils.
Veronica Asensio - One of the best experts on this subject based on the ideXlab platform.
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contribution of waste and biochar amendment to the sorption of metals in a copper Mine Tailing
Catena, 2016Co-Authors: Rubén Forján, Veronica Asensio, Alfonso Rodriguezvila, Emma Fernández CoveloAbstract:Abstract One technique applied to restore degraded or contaminated soils is to use amendments made of different types of waste materials, which in turn may contain metals such as Cu, Pb and Zn. For this reason it is important to deterMine the capacity of the soil to retain these materials, and to compare the sorption capacity between an amended soil and another unamended soil. The aim of this study was to deterMine the chemical behaviour of these metals in the soil after applying the amendment, and how it affected the soil's sorption capacity. Another aim was to study the contribution of contaminating elements from the amendment itself. The amendments used in this study were a mixture made of waste material (sewage sludges, sludges from an aluminium plant, ash, food industry wastes, and sands from a wastewater treatment plant) and biochar (biomass of Acacia dealbata ) (97%:3%) in different soil/amendment proportions. The soil was from a Mine Tailing. The Mine Tailings were amended with the mixture of waste and biochar which had a higher sorption capacity than the soil from the pond. The samples with amendment had a greater affinity for Cu, Pb and Zn than the Mine soil. The results obtained show that adding a mixture made of waste and biochar favours the retention of Cu, Pb and Zn in Mine Tailing from metal Mines.
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Contributions of a compost-biochar mixture to the metal sorption capacity of a Mine Tailing
Environmental Science and Pollution Research, 2015Co-Authors: Rubén Forján, Veronica Asensio, Alfonso Rodríguez-vila, Emma Fernández CoveloAbstract:One technique applied to restore degraded or contaminated soils is to use amendments made of different types of waste materials, which in turn may contain metals such as Cu, Pb and Zn. For this reason, it is important to deterMine the capacity of the soil to retain these materials, and to compare the sorption capacity between an amended soil and another unamended soil. The aim of this study was to deterMine the mobility and availability of these metals in the soil after applying the amendment, and how it affected the soil’s sorption capacity. Sorption isotherms were compared with the empirical models of Langmuir and Freundlich to estimate the sorption capacity. The overall capacity of the soils to sorb Cu, Pb or Zn was evaluated as the slope Kr. The amendments used in this study were a mixture made of compost and biochar in different proportions (20, 40, 60, 100 %), which were applied to the Mine Tailing from a settling pond from a copper Mine. The Mine Tailing that were amended with the mixture of compost and biochar had a higher sorption capacity than the Mine Tailing from the unamended pond, and their sorption isotherms had a greater affinity towards Cu, Pb and Zn than the Mine Tailing that was studied. Therefore, the results obtained show that adding a mixture of compost and biochar favours the retention of Cu, Pb and Zn in Mine Tailing.
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Changes in the Phytoavailability of Nutrients in Mine Soils after Planting Trees and Amending with Wastes
Water Air and Soil Pollution, 2014Co-Authors: Veronica Asensio, Flora A. Vega, Emma Fernández CoveloAbstract:The purpose of the present study was to evaluate the effect of planting trees (Pinus pinaster or Eucalyptus globulus) and amending with wastes (sewage sludges and paper mill residues) on the nutrient content of Mine soils and under field conditions. The studied soils were located in a settling pond and a Mine Tailing within a former copper Mine. The soil samples were analyzed for several physico-chemical characteristics and the concentration of nutrients. The untreated settling pond soil had levels of N and K adequate only for the growth of eucalyptuses and pines, and moreover, the concentration of Ca and P were undetectable. The untreated Mine Tailing soil presented the same condition, also with adequate levels of Ca and Mg for eucalyptuses and pines. Planting these trees increased the concentration of Mg in the settling pond up to adequate levels only for such trees. Amending with wastes increased the phytoavailable concentration of all nutrients up to adequate levels for most plant species. In conclusion, it is recommended to amend Mine soils with wastes rich in nutrients and re-amend after some time because they raise them up to adequate levels for most plants but are depleted over time. It is possible to increase the concentration of all nutrients in Mine soils by adding organic wastes, even to values adequate for most plant species.
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soil management of copper Mine Tailing soils sludge amendment and tree vegetation could improve biological soil quality
Science of The Total Environment, 2013Co-Authors: Veronica Asensio, Emma Fernández Covelo, Ellen KandelerAbstract:Mine soils at the depleted copper Mine in Touro (Northwest Spain) are physico-chemically degraded and polluted by chromium and copper. To increase the quality of these soils, some areas at this Mine have been vegetated with eucalyptus or pines, amended with sludges, or received both treatments. Four sites were selected at the Touro Mine Tailing in order to evaluate the effect of these different reclamation treatments on the biological soil quality: (1) Control (untreated), (2) Forest (vegetated), (3) Sludge (amended with sludges) and (4) Forest + Sludge (vegetated and amended). The new approach of the present work is that we evaluated the effect of planting trees or/and amending with sludges on the biological soil quality of Mine sites polluted by metals under field conditions. The addition of sludges to Mine sites recovered the biological quality of the soil, while vegetating with trees did not increase microbial biomass and function to the level of unpolluted sites. Moreover, amending with sludges increased the efficiency of the soil's microbial community to metabolize C and N, which was indicated by the decrease of the specific enzyme activities and the increase in the ratio Cmic:Nmic (shift towards predominance of fungi instead of bacteria). However, the high Cu and Cr concentrations still have negative influence on the microorganisms in all the treated soils. For the future remediation of Mine soils, we recommend periodically adding sludge and planting native legume species.
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technosols made of wastes to improve physico chemical characteristics of a copper Mine soil
Pedosphere, 2013Co-Authors: Veronica Asensio, F A Vega, M.l. Andrade, Emma Fernández CoveloAbstract:Mine Tailing soils created from the copper extraction in Touro Mine (Northwest Spain) are very degraded both physically and chemically. Three plots in this Mine Tailing were amended with Technosols in different proportions in each one to know if this mixture improved the physico-chemical characteristics of the Mine soil and contaminated it with heavy metals. The Technosols were made of organic wastes, including mussel residues, wood fragments, sewage sludges and paper mill ashes. An unamended area was used as a control soil. Pseudototal and diethylenetriaMinepentaacetic acid (DTPA)-extractable contents of Al, Cr, Cu, Fe, Mn, Ni, Pb and Zn were deterMined in soil samples. The untreated soil had significant limitations for vegetation growth. All the Technosols improved the properties of the Mine soil by increasing organic carbon and pH value, but they added Ni, Pb or Zn to the soil. It is advisable to check whether the heavy metal concentrations of the wastes are hazardous or not before adding to soils. It is also necessary to study the effect of these wastes over time and in more areas to conclude if they are actually favourable to restore degraded Mine soils.
Gert Dudel - One of the best experts on this subject based on the ideXlab platform.
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accumulation of arsenic in lemna gibba l duckweed in Tailing waters of two abandoned uranium mining sites in saxony germany
Science of The Total Environment, 2005Co-Authors: Martin Mkandawire, Gert DudelAbstract:Accumulation of arsenic in Lemna gibba L. was investigated in Tailing waters of abandoned uranium Mine sites, following the hypothesis that arsenic poses contamination risks in post uranium mining in Saxony, Germany. Consequently, macrophytes growing in Mine Tailing waters accumulate high amounts of arsenic, which might be advantageous for biomonitoring arsenic transfer to higher trophic levels, and for phytoremediation. Water and L. gibba sample collected from pond on Tailing dumps of abandoned Mine sites at Lengenfeld and Neuensalz-Mechelgrun were analysed for arsenic. Laboratory cultures in nutrient solutions modified with six arsenic and three PO43− concentrations were conducted to gain insight into the arsenic–L. gibba interaction. Arsenic accumulation coefficients in L. gibba were 10 times as much as the background concentrations in both Tailing waters and nutrient solutions. Arsenic accumulations in L. gibba increased with arsenic concentration in the milieu but they decreased with phosphorus concentration. Significant reductions in arsenic accumulation in L. gibba were observed with the addition of PO43− at all six arsenic test concentrations in laboratory experiments. Plant samples from laboratory trials had on average twofold higher bioaccumulation coefficients than Tailing water at similar arsenic concentrations. This would be attributed to strong interaction among chemical components, and competition among ions in natural aquatic environment. The results of the study indicate that L. gibba can be a preliminary bioindicator for arsenic transfer from substrate to plants and might be used to monitor the transfer of arsenic from lower to higher trophic levels in the abandoned Mine sites. There is also the potential of using L. gibba L. for arsenic phytoremediation of Mine Tailing waters because of its high accumulation capacity as demonstrated in this study. Transfer of arsenic contamination transported by accumulations in L. gibba carried with flowing waters, remobilisation through decay, possible methylisation and volatilisation by L. gibba need to be considered.
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uranium attenuation from Tailing waters by floating macrophyte lemna gibba l
2002Co-Authors: Martin Mkandawire, Gert DudelAbstract:Biosorption of uranium from Mine Tailing waters by floating macrophyte Lemna gibba L. was investigated in nutrition solutions. Changes in pH (from average 7.0 to 5.5), speciation and removal of U from the solutions and accumulation in the plant directly corresponded to specific growth rate, Fe and PO4 speciation. Macrophytes (e.g. Lemna sp.) are reported to produce a range of 5-l000µg kg-1 day-1 dry biomass of organic compounds particularly oxalic acids and proteins which are triggered by Fe, or PO4 deficiency. Modelling predicts specation change of Fe and PO4, and U-oxalic comlexation which influence U speciation and its bioavailability.
Jen-how Huang - One of the best experts on this subject based on the ideXlab platform.
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leaching characteristics of vanadium in Mine Tailings and soils near a vanadium titanomagnetite mining site
Journal of Hazardous Materials, 2014Co-Authors: Jinyang Yang, Ya Tang, Evert J. Elzinga, Ashaki A. Rouff, Kai Yang, Jen-how HuangAbstract:A series of column leaching experiments were performed to understand the leaching behaviour and the potential environmental risk of vanadium in a Panzhihua soil and vanadium titanomagnetite Mine Tailings. Results from sequential extraction experiments indicated that the mobility of vanadium in both the soil and the Mine Tailings was low, with <1% of the total vanadium readily mobilised. Column experiments revealed that only <0.1% of vanadium in the soil and Mine Tailing was leachable. The vanadium concentrations in the soil leachates did not vary considerably, but decreased with the leachate volume in the Mine Tailing leachates. This suggests that there was a smaller pool of leachable vanadium in the Mine Tailings compared to that in the soil. Drought and rewetting increased the vanadium concentrations in the soil and Mine Tailing leachates from 20 μg L−1 to 50–90 μg L−1, indicating the potential for high vanadium release following periods of drought. Experiments with soil columns overlain with 4, 8 and 20% volume Mine Tailings/volume soil exhibited very similar vanadium leaching behaviour. These results suggest that the transport of vanadium to the subsurface is controlled primarily by the leaching processes occurring in soils.
En Tao Wang - One of the best experts on this subject based on the ideXlab platform.
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kocuria arsenatis sp nov an arsenic resistant endophytic actinobacterium associated with prosopis laegivata grown on high arsenic polluted Mine Tailing
International Journal of Systematic and Evolutionary Microbiology, 2016Co-Authors: Brenda Romanponce, Dan Wang, Maria Soledad Vasquezmurrieta, Wen Feng Chen, Paulina Estradade Los Santos, Xin Hua Sui, En Tao WangAbstract:A Gram-stain-positive, aerobic, non-motile, coccoid, arsenic-resistant actinobacterial strain, designated CM1E1T, was isolated from the lateral root tissue of Prosopis laegivata grown on a Mine Tailing in San Luis Potosi, Mexico. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain CM1E1T was clustered closely with species of the genus Kocuria, and showed the highest sequence similarity of 98.7 % to Kocuria rhizophila TA68T. The DNA G+C content of strain CM1E1T was 74.5 mol% (T m ). The major fatty acids were anteiso-C15 : 0, anteiso-C17 : 0 and iso-C15 : 0. The peptidoglycan of the cell wall contained lysine and alanine. The major respiratory quinones were MK-7(H2) and MK-8(H2). On the basis of the phenotypic characterization, phylogenetic relationships and chemotaxonomic analyses, strain CM1E1T represents a novel species of the genus Kocuria, for which the name Kocuria arsenatis sp. nov. is proposed. The type strain is CM1E1T ( = CCBAU 101092T = HAMBI 3625T = LMG 28671T).