Notice of RetractionCharacterizations of Chromium Adsorption of Anaerobic Granular Sludge in Wastewater

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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In this study the characteristics of Chromium (Cr (VI)) adsorption of anaerobic granular sludge in wastewater as well as the environmental factors that influenced on the adsorption efficiency were investigated using the static sequencing batch method in a laboratory condition. The results showed that the anaerobic granular sludge had strong and fast speed adsorption capacity for Cr (VI) adsorption in wastewater. The adsorption equilibrium could be reached in 120 min, and the maximum adsorption rate was 98.1%. The adsorption process fitted to the Pseudo-second Order Adsorption Kinetics Model. The pH value was the most important factor affecting Cr (VI) adsorption. In a neutral or light acidic condition, the adsorption rate was high. However, when the pH value was greater than 8 or less than 4, the adsorption efficiency declined. Temperature was another factor affecting adsorption but its effect was small. The amount of anaerobic granular sludge used also had a significant effect on Cr (VI) adsorption. A dose of 30 ml sludge could get the best adsorption efficiency. Our results suggest the anaerobic granular sludge is a potential Cr (VI) cleaner in wastewater.