This paper describes a derivative-free method that aims to solve an optimization problem arising from the mathematical formulation of an activated sludge system in which the objective is to minimize the investment and operation costs. The method relies on an augmented Lagrangian technique that uses a pattern search for solving bound constrained subproblems.
The applicability of trivalent chromium removal from aqueous solutions using calcium alginate beads was studied. The equilibrium isotherms were plotted at two temperatures. The relationship between the chromium sorbed and the calcium released was determined as well as the effect of alginate amount and initial pH on the equilibrium results. Chromium sorption kinetics were evaluated as a function of chromium init...
A utilização de biopolímeros como materiais biossorventes na remoção de metais pesados de efluentes industriais é uma alternativa atraente em relação aos dispendiosos métodos fisico-químicos tradicionais, e com vantagens em relação ao uso de microorganismos vivos no que respeita à susceptibilidade às agressões do meio e à necessidade de nutrientes. Neste trabalho, é caracterizada a remoção de crómio trivalente ...
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