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.
