Last modified: 2015-11-20
Abstract
Large quantities of synthetic dyes are extensively used in different industries such as textile, tannery, paint, cosmetic, food and pharmaceutical. These synthetic dyes are removed from waste water using different adsorbents (molecular-sieve zeolites, activated alumina, silica gel, and activated carbon). In this study, low cost adsorbents derived from agriculture waste (saw dust, rice husk and bagasse) has been used to remove Congo red dye from waste water. Effect of contact time, amount of adsorbent, initial concentration of dye, temperature of the solution and pH of the solution were studied. It was evident from the study that low cost adsorbents derived from agricultural waste have demonstrated outstanding capabilities for the removal of Congo red dye. Amount of dye adsorbed per unit mass of adsorbent increased with increasing initial dye concentration (25 to 150mg/l) and solution temperature (25 to 55 °C) while it decreased with increasing adsorbent dosages (0.20 to 1.2 g/50 ml) and pH of the solution (5.5 to 10). Results showed by low cost adsorbents derived from agriculture waste are promising and could be used as an effective alternative. After the application of ANOVA, a three-way significant interaction was observed. However, initial concentration of dye was found to be the most important parameter for dye removal using low cost adsorbents.
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