1,721,001 research outputs found
Phytoremediation strategies in the reclamation of a soil polluted by pyrite cinders: a preliminar survey
No full textEffetti del Biochar sugli inquinanti inorganici: possibilità d’impiego nel recupero ambientale.
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Evaluation of phytostabilization of mine tailings after biochar amendment.
No full textPhytostabilization is one of the possible interventions to reduce the risks of contamination posed by mine tailings. This technique aims at reducing the mobility of the pollutants by establishing a green cover on the wastes. Recent studies, have focused the attention on biochar application to soil. Biochar is a C-rich product obtained when biomass is heated with limited oxygen supply and at relatively low temperature (<700°C). Some experiments revealed the potential benefits that biochar application induces to the soil in terms of property changes that turns into yield improvements. Biochar also seems to reducing the uptake of toxic elements by plants by reducing their bioavailability. The case study is represented by the past mining site of Cave del Predil (NE Italy) where about 20 hectares of dumping site lay undisturbed. Among the local species found on the site, Poa alpina and Anthyllis vulneraria were selected as possible candidates for phytostabilization. Two other species were selected: Festuca rubra and Buphtalmum salicifolium. The pot experiment aims at testing the four species on the following substrates: control (untreated mine tailings); 3 levels of equal rate of biochar and compost amendments applied to the mine tailings (0.5, 1 and 2%dw); the previous 4 substrates with mineral fertilization (NPK). At the end of the growing period, the plants will be harvested and the heavy metals content will be analyzed in their tissues (roots and shoots). The data from the metal uptake and accumulation and the biomass production will give important hints on the feasibility of the remediation process
Agronomy towards the Green Economy. Optimization of metal phytoextraction
Full text linkTraditional techniques for remediation of polluted soils are based on a physical-chemical approach; such techniques are expensive, have adverse effects on soil quality and are often highly expensive. In the scenario of the Green Economy, low cost and impact technologies should be promoted. Phytotechnologies are remediation technologies that use plants for the containment, degradation or removal of contaminants from polluted matrices for the restoration of degraded ecosystems. The process of phytoextraction is substantially based on plant-soil interactions that involves the mass transfer of an inorganic pollutant from the bulk soil to the plant biomass. This implies that the management of the two elements of the system (plant and soil) should have effects on the efficiency of the process. As phytoremediation is essentially an agronomic approach, its success depends ultimately on standard agronomic practices. The present paper aims give an overview on the role of agronomy in the optimization of metal phytoextraction is focused
Trace elements uptake by metal accumulator species grown on mine tailings amended with three types of biochar.
No full textMine tailings are of great concern due to the risk their toxic inorganic elements pose to the environment. The application of biochar as an amendment may be a solution to reduce the risk of pollutant diffusion. The main purpose
of the research was to verify the effects of different types of biochar produced from different feedstocks
(pruning residues, fir tree pellets and manure pellets) on changing the substrate conditions to promote plant
growth for the phytostabilization of mine tailings. The SEM/EDX characterization showed different structures
in terms of porosity and granulosity as well as the element composition. The plants used in the pot experiment were Anthyllis vulneraria subsp. polyphylla (Dc.) Nyman, Noccaea
rotundifolium (L.) Moench subsp. cepaeifolium and Poa alpina L. subsp. alpina. The biochars were applied at three
doses: 0, 1.5 and 3%dw. Although to different extents, the biochars induced significant changes of the substrates
in terms of pH, EC, CEC and bioavailability of themetals. The biochar frommanure pellets and pruning residues reduced shoot Cd and Pb accumulations. The former also led to a higher biomass production that peaked at the1.5%
dose.
Biochar has great potential as an amendment for phytoremediation but its effects depend on the type of feedstock it derives from. The characteristics of the substrate to be treated are crucial for the biochar selection
Biochar amended mine tailings: observations on plant survival
No full textBiochar (BC) is a C rich product obtained by thermal decomposition of organic material, such as wood or manure, under limited supply of oxygen (O2), at relatively low temperatures (<700 °C). It is a black material composed of stable C that have been proposed as an alternative solution for C sequestration. The effects that BC can produce on both the chemical and physical properties of soil have been described by many authors. Its application on polluted soils or matrices may have significative variations on the migration and bioavailability of the pollutants, therefore on the phytotoxicity that hinders plant growth.
Four types of feedstocks were pyrolized using the LuciaStove (WorldStove), a top-lit pyrolytic gasifier cook-stove, and the BCs obtained after the process were mixed in three doses (0, 0.75 and 1.5%dw/dw) with metal-rich mine tailings (23.6±0.656 mg kgss-1 Cd; 3,218±185 mg kgss-1 Pb; 118±9.32 mg kgss-1 Tl; 13,672±336 mg kgss-1 Zn) from the mining site of Cave del Predil (NE, Italy). A pot experiment will be set up with three species (Anthyllis vulneraria, Poa alpina, Biscutella laevigata) from the mining site. The plants will be grown for 45 d on the four substrates. At the end of the growing period, plants will be harvested and analyzed to measure the elemental composition, the metal bio-accumulation and the biomass production. The substrates will be characterized in terms of chemical and physical properties, particularly focusing on heavy metals and metalloids composition, mobility of the pollutants, but also fertility and phytotoxicity.
The fertility of the mine tailings, in terms of nutrient and water retention, is expected to be increased by the treatments while the phytotoxicity, in terms of bioavailability and leachability of pollutants, is expected to be lowered. These changes are expected to be reflected on the plant growths
Nano-enabled agriculture and circular economy. Nature-derived materials as smart-delivery systems
Full text linkRIMOZIONE DI METALLI PESANTI DA UN SUOLO MULTICONTAMINATO MEDIANTE FITOESTRAZIONE IN SITU DI TORVISCOSA
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