http://lattes.cnpq.br/5518707930870527; SOUZA, Ielda Raiana Santos de.
Résumé:
Research laboratories generate very significant amounts of effluents
liquids with a high toxic load, consisting of heavy and complexing metals that
when disposed of or improperly disposed of, they cause serious damage to the environment
environment and human health. When choosing a method of treatment or disposal
final and essential to know in detail the characteristics of the waste, its origin,
and its constituents. As this knowledge is often not viable,
indispensable preliminary tests of the process efficiency and feasibility studies
technical-economic
For this purpose, this work presents a whole investigation and a survey,
regarding the quantity, variety, form of storage, identification of liabilities and
form of disposal of these liquid residues generated in the Electrochemistry laboratory of
UFCG- CES, Cuité campus. Soon the work was divided into three parts, where
first there was a survey of the liabilities stored in the laboratory. On Monday
stage, the identification and separation of the residues was carried out, by color, an analysis
visual, making a superficial separation and storage. In the third, the
characterization of the residue. In the fourth and last stage, precipitation tests were performed
with Na OH and Na2HP04, as a proposal for a possible and subsequent treatment of these
waste.
We concluded that visual analysis allowed us to separate by colors, and made us
deduct the main component of each container / color. The determination of ST by
evaporation, proved to be efficient in reducing the liquid fraction, waste. The pH of
liquid waste and similar to the pH values used in the electrodeposition processes
of the LEC, being in a range of 6.4 to 7.4. The density of the residues is proportional to the
used in research electrodeposits.
Of the precipitation analyzes, the highest percentage of metal removal was with the
addition of 10.0mL of Na2HP04 to 20mL of liquid residue, which presented the lowest
conductivity and pH. Therefore, we conclude that the precipitation process, in the treatment
primary residue, proved to be efficient and satisfactory.