High removal of phosphate from wastewater using silica sulfate
- High removal of phosphate from wastewater using silica sulfate
- W.Jutidamrongphan; 박기영; S.Dockko; 최재우; 이상협
- Equilibrium isotherm; kinetic adsorption; phosphate; silica sulfate; Zr-MCM 41; Zr ferrite
- Issue Date
- Environmental chemistry letters
- VOL 10, NO 1, 21-28
- This report shows that silica sulfate is removing
phosphate from wastewater very efficiently. Phosphorus
removal and recovery from wastewater is a worldwide
issue due to pollution of natural waters by phosphate and
depletion of phosphate ores. Adsorption is a process that
can remove phosphate at low concentrations. Adsorption
also allows the recovery of phosphate for possible re-use.
Here, we studied the adsorption of phosphate from wastewater
using commercial Zr ferrite, Zr-MCM 41 and silica
sulfate. We calculated equilibrium isotherms, kinetic
models and thermodynamic effects under conditions similar
to real wastewaters. We found that the equilibrium data
for the adsorption of phosphate were best fitted to the
Freundlich model. The results show that the maximum
uptake of phosphate was 3.36 mg g-1 for Zr-MCM,
27.73 mg g-1 for Zr ferrite and 46.32 mg g-1 for silica
sulfate. The kinetic results of the three adsorbents were
satisfactorily predicted using a pseudo-second-order
model. We found that silica sulfate provided excellent
characteristics in terms of the maximum adsorption and
rate constant for the adsorption of phosphate. The thermodynamic
data showed that increasing the temperature
enhanced the adsorption of phosphate onto silica sulfate.
Our findings will help to define efficient methods to
remove phosphate from wastewater.
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