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Red de Revistas Científicas de América Latina y el Caribe, España y Portugal
Removal of rnicronutrients from anaerobic sludge during incubation
with molasses stillage
Ilangovan, K., Ramirez, G., Rosas,
y Noyola, A.
Instituto de Ingenierla División ambiental, Apdo. Postal 70-472
UNAM, 04510, México D.F.
Molasses stillage contain high concentration of K (7 to
sulphate (3 to 9
and heavy organic load
to 100 g/L). K
ion is one of the physicochemical parameters to study for the
biochemical interaction with anaerobic microorganisms bacause its
behaviour in the anaerobic environment is different, and it
limit the availability of micronutrients to the bacterial matrix.
Laboratory experiments were carried out to study the removal of
micronutrients from the bacterial matrix when incubating the
molasses stillage with sludge adapted to anaerobic conditions.
Molasses stillage was sampled after 6, 12, 24, 48 and 72 h for
the analysis of the following metals: Cu, Zn, Na, Co, Mo, Ni, Mg,
Ca and Fe. Mo, Ni and Co were found to be absent in the molasses
stillage as well as in sludge. Among the micronutrients Zn, Cu
and Fe were gradually removed from the sludge during the
incubation with molasses stillage. For the experiments, tap water
and synthetic molasses stillage without K were served as control
From this study it is evident that heavy concentration of K ions
in the molasses stillage removed the important micronutrients
which are necessary for the metabolic activities of the anaerobes
from the sludge matrix.