Full text
| |
| Author(s): |
Monalisa Franco
Total Authors: 1
|
| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Agrícola |
| Defense date: | 2015-08-28 |
| Examining board members: |
José Euclides Stipp Paterniani;
Edilaine Regina Pereira;
Marco Roberto Pires;
Lubienska Cristina Lucas Jaquiê Ribeiro;
Ariovaldo José da Silva
|
| Advisor: | José Euclides Stipp Paterniani |
| Abstract | |
Metals are essential for human life, but become toxic when their concentrations exceed the limits tolerated by the body. Because of the large volume of domestic wastewater, agricultural and industrial untreated discharges into water sources, the concentration of heavy metals has become a major concern from an environmental point of view and public health. The forms of removing heavy metals from aquatic systems are varied and most of them present the disadvantage of a high chemical compound or high technology been required for good efficiency in treatment. Alternatively, bioremediation is an alternative consisting in the use of natural compounds in the heavy metals removal from aquatics systems. Moringa oleifera seeds have been detached from the natural compounds studied in bioremediation. Therefore, this paper presents the results of Zn+2 (II), Cu+2 (II) and Cd+2 (II) adsorption in concentrations of 50, 25 and 7.5 mg L-1 by applying the liquid solution and powder of Moringa oleifera seed at different concentrations. Assays were performed for the dispersion of the biosorbent solution protein and jar-test tests with slow and rapid stirring and then rapid sedimentation or filtration. The filtration process was composed of filter layers of nonwoven fabrics and filtration rate typically used in slow filtration of 6m³ / m².dia was used. Furthermore, tests were performed as varying pH, temperature, turbidity and acute toxicity of the samples in Vibrio fisheri. The dispersion results demonstrate that the higher the concentration of biosorbent applied in the form of powder or liquid solution, the greater the protein concentration in the system. The process of slow filtration nonwoven provided higher efficiency of removing metals studied comparing to stirring step. The maximum values of the metal removal efficiency were 76, 74 and 50% by the application of Moringa oleifera seed powder for the samples with zinc, copper and cadmium, respectively. And the use of liquid solution afforded removal efficiency of 58, 71, 70% respectively (AU) | |
| FAPESP's process: | 11/08233-9 - Removal of heavy metals from water by slow filtration with nonwoven blankets with coagulant extracted from Moringa oleifera seeds as auxiliary. |
| Grantee: | Monalisa Franco |
| Support Opportunities: | Scholarships in Brazil - Doctorate |