| Abstract |
| It was examined the effect of temperature on the precipitation treatment of zinc-ion containing wastewater quantitatively by thermodynamic estimation. The thermodynamic calculation was carried out employing theoretical equations such as Gibbs free energy equation, Nernst equation, and van’t Hoff equation, and the change of equilibrium constant according to temperature was derived based on standard enthalpy values. The stable region of Zn(OH)2 was determined by the boundary pH between Zn2+ ion and Zn(OH)2, and the area of the stable region of Zn(OH)2 was observed to decrease as temperature increases. As temperature rises from 288 K to 318 K by 10 K intervals, the boundary pH between Zn2+ and Zn(OH)2 was investigated to change as pH 5.51, 5.75, 5.98, and 6.19, and the precipitate formation tendency of Zn2+ ion was estimated to be changed as 96%, 93%, and 90% at each temperature by taking the precipitate formation tendency of Zn2+ ion at 288 K as 100%. |
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| Key Words |
| Precipitation Treatment, Temperature, Thermodynamic Estimation, Wastewater, Zinc |
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