INVESTIGADORES
ZARITZKY Noemi Elisabet
artículos
Título:
Application of biological indices and a mathematical model for the detection of metal coagulant overload in a laboratory scale activated sludge reactor with phosphate simultaneous precipitation
Autor/es:
CAROLINA DE GREGORIO,; ALEJANDRO H. CARAVELLI; ZARITZKY NOEMI.
Revista:
CHEMICAL ENGINEERING JOURNAL
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Lugar: Amsterdam; Año: 2011 vol. 172 p. 52 - 60
ISSN:
1385-8947
Resumen:
Phosphorous simultaneous precipitation by
coagulants reduces the volatile solids percentage which can be deleterious to
the biological process. In this work a mathematical model was developed and
biological indices were applied to control Fe(III)-dosed activated sludge
systems. A molar ratio Fe:P = 1.92.3:1 on the aeration basin of a
laboratory-scale activated sludge reactor caused a progressive enrichment of
the sludge with inorganic solids deteriorating the system performance. Crawling
and attached ciliates were the most sensitive organism groups to these changes.
The proposed mathematical model estimated: (i) the threshold concentration of
fixed suspended solids, above which the reactor performance deteriorates, and
(ii) the decay of the most sensitive organism groups with time. The ShannonWiener
and sludge biotic indices predicted the decrease of the reactor performance by
coagulant overload. The simultaneous application of the mathematical simulation
and the biological indices guarantees a successful control of systems operated
with phosphorous simultaneous precipitation by Fe(III)