info:eu-repo/semantics/article
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
Fecha
2011-08Registro en:
de Gregorio, Carolina; Caravelli, Alejandro Horacio; Zaritzky, Noemi Elisabet; 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; Elsevier Science Sa; Chemical Engineering Journal; 172; 1; 8-2011; 52-60
1385-8947
1873-3212
CONICET Digital
CONICET
Autor
de Gregorio, Carolina
Caravelli, Alejandro Horacio
Zaritzky, Noemi Elisabet
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 = 1.9–2.3:1 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 Shannon–Wiener 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).