Chrome (VI) Removal from Wastewater Using Water Treatment Plant Sludge as an Adsorbent

  • Awugchew Teshome Ayele
  • Wegene Deriba Regasa


Background: The extensive use of chromium in industries such as electroplating, steel production, wood preserva­tion and leather tanning can result in release of chromium containing effluents. Hexavalent chromium in the envi­ronment has been often harmful and it should be treated before releasing into the environment. So far various wastewater treatment techniques have been used to remove heavy metals from industrial wastewater. Due to this, adsorbent with high removal capacity, low cost and easy accessibility will be a choice for industrial wastewater treatment option. This study aimed at removing chromium from wastewater using low cost alum based water treat­ment plant sludge, as an adsorbent.

Methods: The study was conducted on removal of Cr (VI) by alum based water treatment sludge through batch ad­sorption experimental study. Response surface methodology was applied in batch wise experiment to evaluate the process viable, Cr (VI) concentration, pH, adsorbent dose, time and temperature.

Results: Chrome (VI) concentration and pH increase was found to decrease chrome removal, while adsorbent dose and shaking time increase, increase chrome removal. Cr (IV) concentration with pH shows that maximum chrome removal 95.62% was obtained at Cr (IV) concentration of 2.4mg/l and pH 2.45, while the interaction of Cr (IV) con­centration and adsorbent dose shows, 97.06% chrome removal was obtained at a chrome concentration of 3.3mg/L and adsorbent dose of 6.3g.

Conclusion: Alum based water treatment sludge is a suitable material from which a low-cost adsorbent for removal of Cr (VI) can be developed.

Keywords: Alum Based Water Treatment Sludge; Batch Adsorption; Cr (VI); Response Surface Methodology


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