Session of scientific communications - April 19, 2012
Researches on unconventional technologies for biological treatment of wastewater
Emilia Gabriela IACOBESCU, Violeta Monica RADU
The present paper is part of PN project, June 09 06 02 43, which it has been organized in three work-packages:
In lakes and ponds formed upon controlled discharge of wastewater, superior plants’ growth which develops as a result of high consumption of existing nutrients in the aquatic environment. In this study, a comparison is made between absorption capacity of pollutants by Nil Salad (Pistia stratiotes), Water Hyacinth (Eichornia crassipes), Rush (Typha angustifolia), Plaque of Water (Elodeea canadensis) and Iris Pond (Iris pseudacorus) used in the biological treatment process, highlighting the individual advantages and disadvantages in relation to physical and chemical properties of wastewater. In the most studied cases, the plants presented are very efficient, driving to a decrease of concentration of pollutants in lakes and artificial ponds. Moreover, the Water Hyacinth and Nil Salad, because of their fast growth rate are used also for soil fertilization, in animal’s meal and to obtain biomass. |
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Analysis techniques used in the laboratory for physico-chemical and mechanical characterization of samples from different research works
Olteanu Marius, Andreea Moncea
| The paper presents analysis techniques and sample preparation procedures to characterize their physico-chemical and mechanical. The physico-chemical analysis showed refers to the establishment of the oxide samples’s composition by X-ray fluorescence and their behavior within different corrosive environments (sulfate, saline). Both for the physico-chemical and for the mechanical analysis are described the operational stages and the equipment used. The mechanical resistance tests allow to estimate the mechanical behavior on compressive stresses and bending on different types of samples. By determining the sample composition with the X-ray fluorescence we can obtain the necessary information for explaining the samples behavior. The results obtained with the corrosion tests are very useful for further determining the destination of analyzed types of mortar and the effects that it may have on other types of samples. The precursory stages of the in fact analysis are very important and may be a source of appearance for errors in the obtained final result. All the examples showed are characterizations made in the department for samples that came from different research works. |
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Cd(II) Recovering Separation from Aqueous Systems by Flotation
Larisa BODEA1, Carolina CONSTANTIN2
1 National institute for Research & Development in Environmental Protection, Bucharest, Romania
2 Faculty of Applied Chemistry and Materials Science, Politehnica University, , Bucharest, Romania
| The presence of inorganic pollutants, especially of heavy metal ions has a negative impact in aqueous media, with severe consequences for environment. The present paper presents the experimental results of the researches concerning Cd(II) recovering separation from “model” aqueous systems by precipitate flotation with natrium oleate as collector. The influencing factors were studied: pH, collector concentration, metallic ion concentration, necessary gas flow. The insoluble species of Cd(II), isolated in flotation process were characterized by physical-chemical methods, in order to establish the collector-Cd(II) interaction, the geometry and the stoichiometry of isolated compounds. The settled optima parameters were checked in real waste water. |
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