CINDEFI   05381
CENTRO DE INVESTIGACION Y DESARROLLO EN FERMENTACIONES INDUSTRIALES
Unidad Ejecutora - UE
capítulos de libros
Título:
Application of Integrated Microbial Processes for Heavy Metal Recovery from Industrial Wastes of Buenos Aires, Argentina
Autor/es:
PLAZA CAZON J.; YAGNENTKOVSKY N.; VIERA M.; DONATI E.R.
Libro:
Bioremediation in Latin America
Editorial:
SPRINGER
Referencias:
Año: 2014; p. 149 - 164
Resumen:
To allow the final disposal of galvanic sludge from a wastewater
treatment plant of automotive factory, integrated microbial processes
were performed to release and recover nickel and zinc contained in
the solid residue. The metals were successfully leached using sulfuric
acid continuously produced by Acidithiobacillus thiooxidans biofilm on
elemental sulfur. The best condition using a sludge pulp density of 1
% w/v and a dilution rate of 0.22 h−1
100 % allowed more than 90 %
of nickel and zinc dissolution, respectively; higher values of dilution
rate and/or pulp density decreased the percentages of metal dissolution.
The recovery of metals from the leachates was performed by continuous
adsorption on Undaria pinnatifida biomass after raising the pH up to 4.
Adsorption processes allowed great recoveries of nickel and zinc from
monometallic solutions at the lowest flow rate (100 and 90 %); the
recoveries from the leachates were not so good and to increase them three
fixed bed columns in series were used reaching approximately 50 and 80
% of nickel and zinc recovery respectively, even at high dilution rates
(more than 1.5 h−1
). This integrated process could be applied on a higher
scale.