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Enhancement of As(V) adsorption onto activated sludge by methylation treatment |
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| Authors: | So-Young Kang Dong-Wook Kim Kyoung-Woong Kim |
| Institution: | (1) Center for Resource Management, Korea Institute for Defense Analyses (KIDA), Seoul, 130-650, South Korea;(2) Department of Environmental Engineering, Kongju National University, Cheonan, 330-717, South Korea;(3) Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 500-712, South Korea |
| Abstract: | Biosorption properties of arsenate As(V)] onto activated sludge were investigated in batch systems. The adsorption of As(V) onto sludge increased from 23 to 266 μg/g dry weight through the methylation of the activated sludge. This increase resulted from neutralization of carboxylic groups via the methylation process. The pH effect of As(V) uptake was also investigated and As(V) adsorption by methylated sludge decreased significantly at high pH (pH > 11) due to competition between As(V) and OH− ions for binding sites distributed on sludge surfaces. In contrast, low pH favored As(V) adsorption by methylated sludge because of the elevated quantities of positively charged functional groups. The results suggest that methylated activated sludge may provide promising applications for the simultaneous removal and separation of As(V) from aqueous effluents. |
| Keywords: | Biosorption Arsenic Activated sludge Methylation Esterification FTIR analysis |
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