Design and fabrication of column filtration reactor for the removal of dissolved dyes from tannery wastewater

Abstract

The presence of color in many industry effluent streams is esthetically undesirable. Color organic effluent produced in the textile, paper, plastic, leather, food and mineral processing industries are high volume, hazardous and toxic waste. Color removal requires five to twelve times the concentration of dye that is normally used for flocculation, making it an expensive and inefficient p roeess. Thus there i sac lear need for m ore cos! effective and environmentally friendly processes for removal of color from wastewater, Adsorption techniques have proven successful in removing colored organic compounds. Saw dust is an excellent low cos! adsorbent of colored organic anions and may have significant potential as a color removal from tannery wastewater As a result, sawdust is now being considered as low cost adsorption alternatives because they are easily prepared and found every where. Acid activated sawdust (ACSD) was prepared from dried sawdust .with concentrated HCL that can be easily synthesized by co-precipitation of dilute aqueous solutions of dyes. The effectiveness of acid activated sawdust in absorbing Lurazol Brown PH (LBP) dye from aqueous solutions has been studied as a function of agitation time, adsorbent dosage and initial dye concentration. The rate constants were caiculated using Lagergren equation and found to be 0.01512, O.02003and 0.02217for initial concentrations 100, 300 and 500 mgll. The experimental data were also fitted to Langmuir and Frundlich isotherm and found that adsorption process follows both the isotherm. The values of Langmuir and Frundlich constants indicate favorabie and beneficial adsorption.