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Browsing Theses & Dissertations by Author "Acevedo Morantes, María T."
Acevedo Morantes, María T.; Colόn Burgos, Guillermo; College of Engineering; Saliceti Piazza, Lorenzo; Román, Félix; Department of Chemical Engineering; Padilla, Ingrid
The removal of nitrate and potassium from wheat leachate solution was studied
using an electrolytic cell in batch recirculation mode for use in advance life
support systems (ALSS). The ALSS or CELSS (Controlled Ecological Life
Support System) are systems developed to provide all the required basic human
needs for long-term space missions. High nitrate and potassium removals were
obtained at 5, 6, 7, 8 and 9 volts. Anions removals over 90% were obtained after
200 minutes of operation at these constant applied voltages. A maximum nitrate
and potassium removal of 100 % and 99.82%, respectively, was obtained at 9
volts. During the electrolytic cell operation, the removal of monovalent anions
was found to be higher than divalent and trivalent ones. This is different to the
selectivity of monovalent and divalent cations found when use cation-exchange
membrane, the removal of monovalent and divalent cations was very similar.
Electrical resistance measurements showed that under constant applied voltage,
anion membrane fouling decreased with increasing voltage. This is due to the
mobility of anion organic molecules at high voltages. It was also found that the
cation membrane fouling increased with applied voltage and that, at low voltages,
the fouling was absent. It is postulated that these results from a low
concentration of cation organic molecules and to the high molecular weight of
this organics that limits their mobility through of solution.