International Journal of Environmental Science and Development

Abstract—In this study, removal behavior of phosphate from aqueous solution using calcined paper sludge was examined. Paper sludge is discharged as an industrial waste in paper making, and the amount increases annually with the use of the recyclable paper material. The paper sludge disposal becomes an important issue in paper industry, and new utilization is desired. In our previous study, we succeeded to prepare the porous material with high phosphate removal ability from aqueous solution by heating paper sludge at 800 oC. Phosphorus is one of the factors for eutrophication. Therefore, removal behavior of this calcined paper sludge for phosphate was examined to remove phosphate from aqueous solution. Paper sludge was dried and sieved under 250 μm, and calcined at 800 oC for 0 – 60 minutes in an electric oven. The sludge calcined for each calcining time were added to phosphate solution (10 mM KH2PO4), and stirred at 600 rpm with magnet stirrer at room temperature. During stirring, phosphate concentration in solution was analyzed. Phosphate can be removed from aqueous solution using the sludge calcined for more than 20 minutes, due to the amorphous phase to form the phosphate mineral, brushite. From the results of phosphorus removal, reaction kinetics was analyzed using the pseudo-first-order kinetic model and pseudo-second-order model, and the experimental data fit much better to pseudo-first order model than to pseudo-second-order model.

Index Terms—Phosphate removal, calcined paper sludge, calcining time, reaction kinetics, recycling.

K. Kimura and T. Wajima are with the Department of Urban Environment Systems, Graduate School of Engineering, Chiba University, Japan (e-mail: afta3252@chiba-u.jp, wajima@tu.chiba-u.ac.jp).

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Cite: Kentaro Kimura and Takaaki Wajima, "Phosphate Removal Ability of Calcined Paper Sludge from Aqueous Solution — Effect of Calcination Temperature," International Journal of Environmental Science and Development vol. 8, no. 4, pp. 247-250, 2017.