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Development of Treatment Technology for Dye Containing Industrial Wastewater

M. S. I. Mozumder
Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology, Sylhet-3114, Bangladesh

M. A. Islam
Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology, Sylhet-3114, Bangladesh

Abstract/ Executive Summary:

The removal of Congo red was carried out by heating with changing pH, using coagulant and by adsorption. Acidic pH was favorable for the removal of Congo red by heating. It is possible to remove a major portion of Congo red just by decreasing the pH (< 4). Removal studies suggest that coagulation might be the major mode of dye removal. It is becoming a promising alternative to replace or supplement the present dye removal processes from wastewater. In these studies, removal of Congo red from aqueous solution by coagulation and flocculation was investigated. Treatment with alum and lime was found to be the most effective. Activated charcoal is also an effective adsorbent for the removal of Congo red. From the isotherm (Langmuir and Freundlich) and kinetics study we find that the Congo red-activated charcoal system has high affinity and capacity.

Keywords: Congo red; Coagulation; pH; Temperature; Adsorption; Activated charcoal.

Location: Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology, Sylhet-3114

Start Date:

End Date:

Program Area: Risk Management in Agriculture

Commodity: Contamination

Objectives:

This experimental study has been done to make an overview on cost effective removal technique to remove Congo red from industrial wastewater.

Methodology:

Chemicals: The stock solution of Congo red (200 mg/l) was prepared by dissolving Congo red in distilled water. 0.1M Hydrochloric acid (HCl) and 0.1M Sodium Hydroxide (NaOH) were used for controlling the pH. Lime and alum were used for the evaluation of coagulation effect on Congo red removal. All the chemicals used were of analytical reagent grade and were obtained from MERCK, Germany. 2.2. Analyses Batch mode coagulation and other processes were conducted to determine the removal efficiency of the system. In pH and temperature dependent removal technique, we took 200 ml 100 ppm solution and make the desired pH. The experiment was run in temperature range 25-100⁰C. The Separation is carried out by centrifugation and the residual Congo red was analyzed spectrophotometrically (UV-1601, Shimadzu, Japan). For the coagulation process, the tests were carried out with different amounts of lime and alum with 200 ml of Congo red solution of desired concentrations and shaking the mixture continuously at 400 osc/min for 6 hours at room temperature. The activated charcoal (supplied by MARCK, Germany) has the strong adsorption capacity to remove the Congo red. To determine the isotherm and kinetics parameters, the experiments were conducted by shaking 300 mg of adsorbent with 200 ml of Congo red solution of desired concentrations at 400 osc/min for 6 hours at room temperature and neutral pH. The adsorbate was separated from the adsorbent by centrifugation.

Source of Information: J. Sci. Res. 2 (3), 567-576 (2010)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In conclusion (a). Congo red could be removed up to 99% only by heating at pH < 4. (b). Lime wash was an effective method for the remove of Congo-Red and the removal process would be faster, as well as the settling velocity would be increased by using small amount of alum with it. (c). The adsorption of Congo red onto the activated charcoal could successfully be described by both the Langmuir and Freundlich isotherm. (d). The overall Congo red - activated charcoal adsorption kinetic was satisfactorily described by the second order kinetics model. (e). The activated charcoal could be used as an adsorbent for the effectively removal of Congo red from wastewater that disposed from textile industries.

Knowledge Management: Journal