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Otimização do processo de fitorremediação de águas contaminadas com arsênio
| Content Provider | Semantic Scholar |
|---|---|
| Author | Souza, Tamara Daiane De |
| Copyright Year | 2016 |
| Abstract | SOUZA, Tamara Daiane, D.Sc., Universidade Federal de Viçosa, December, 2016. Phytoremediation optimization process of water contaminated with arsenic. Adviser: Alisson Carraro Borges. Co-Advisers: Antonio Teixeira de Matos and Jaime Wilson Vargas de Mello. Environmental contamination by arsenic (As) has been implicated in adverse problems related to ecological damage and human health. The treatment of water contaminated with As can be accomplished by a variety of techniques, among which phytoremediation stands out as high viable alternative, which plants with potential to absorb and create conditions to immobilize the contaminant of interest are used. The objective of this research was to evaluate the influence of pH, phosphate concentration and nitrate concentration in the As uptake by the species Eichhornia crassipes (water hyacinth) and Lemna valdiviana (duckweed) using the surface response methodology in order to optimize the process. In the second stage, it was possible to establish the kinetics of As absorption by the plant species in various As concentrations, study the dynamics of As(III) and As(V) in the environment as well as to evaluate the influence of As in species growth. The optimal levels for the absorption of As by Eichhornia crassipes were reached at pH 7.5; absence of phosphate and minimum nitrate level tested 0.0887 mmol L-1 in the nutrient solution used in the plant cultivation. For Lemna valdiviana, the optimal levels were pH 6.5; phosphorus equal to 0.0488 mmol L-1 P-PO4 and nitrogen in the form of 7.9 mmol L-1 nitrate. The mathematical models proposed for both species fit the data satisfactorily. It was observed that absorption of phosphorus by the plant increased linearly with the concentration of phosphorus in the nutrient solution and led to a decrease in the absorption of As. Under optimized conditions, both species were hyperaccumulating of As at concentrations of up to 1.0 mg L-1 of the metal, concentration at which the plants showed reduced growth. First order kinetics were adjusted to As decay in the aqueous medium by the studied plant species, and the absorption coefficient decreased as the concentration of As was increased. Thus, within the conditions used, the species Eichhornia xvi crassipes and Lemna valdiviana have a high potential for phytoremediation ofwater contaminated with As at full scale. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.locus.ufv.br/bitstream/handle/123456789/10383/texto%20completo.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
