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
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: email@example.com, firstname.lastname@example.org).
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.