IN SITU TREATMENT OF CR+3 ONTO ZERO-VALENT IRON FROM WASTEWATER BY PERMEABLE PACKED COLUMN FILTER

Abstract

The present study was conducted for Cr+3 removal which is one of the most toxic wastewater pollutants onto zero-valent iron. In this system, the toxins are removed from in situ site by an arrival of the wastewater through a permeable sorbent packed columns filter occupied with a special sorbent solid .However, the filter resources should be carefully chosen. A chain of batch tests were handled with synthetic wastewater. The contact time mixing of sorbate and sorbent (0-240) min, initial Cr+3 concentration (50-250) mg/L, pH (3-6), zero-valent iron dosage (10-100) g/ L, and achieve the speed of agitation (50-250) rpm, have been studied the effect of these parameters in batch tests and the outcomes displayed that the optimum values for the efficiency of removal of Cr+3 (=93%) were 90 min, 50 mg/L,4, 50 g/L and 200 rpm respectively. As well as the results showed that the model Langmuir in representation of adsorption data is the best fitting compared with model of Freundlich under the same circumstances. Mathematical model which is established on ''finite element'' technique was handled to simulate the carrying of Cr+3 under equilibrium situation. The data based on predicted and experimental showed that the permeable sorbent filter acting the role of potential in the limitation of the sorbate plume movement and a respectable matching between these data were obtained with RMSE ''root mean squared error'' no more than 0.152.