Resumen

In this study, we aimed to evaluate the adsorption capacity of the Schiff base chitosan-citral for its application in dairy wastewater pre-treatment. Chemical oxygen demand (COD) reduction was the factor used to evaluate the adsorption efficiency. The maximum COD percentage reduction of 35.3% was obtained at 40.0 °C, pH 9.0, adsorbent dose 15 g L^-1, contact time 180 min and agitation speed 100 rpm. It was found that the Langmuir isotherm fitted well the equilibrium data of COD uptake (R2 = 0.968), whereas the kinetic data were best fitted by the pseudo-second order model (R^-2, = 0.999). Enhancement of the adsorption efficiency up to 29.8% in dependence of the initial COD concentration of the dairy wastewater was observed by adsorption with the Schiff base chitosan-citral adsorbent compared to the non-modified chitosan at the same experimental conditions. The results indicated that the Schiff base chitosan-citral can be used for dairy wastewater physicochemical pre-treatment by adsorption, which might be applied before the biological unit in the wastewater treatment plant to reduce the load.

Palabras clave: Chitosan-citral Schiff base adsorption wastewater COD removal efficiency.

2018-10-19   |   102 visitas   |   Evalua este artículo 0 valoraciones

Vol. 9 Núm.1. Enero 2017 Pags. 91-102 Ecologia Balkanica 2017; 9(1)