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Effects of Gamma Ray Irradiation on the Struvite Crystallization of Livestock Wastewater

The struvite crystallization was applied to remove $NH_4{^+}$ in livestock wastewater. The ammonium ions can be very toxic to the aquatic creatures. In this experiments, the livestock wastewater from Gongju livestock wastewater treatment plant was used. The behaviors of various parameters such as pH, mole ratio of $Mg^{2+}$ : $NH_4{^+}$ : $PO{_4}^{3-}$ and reaction temperature for struvite crystallization of livestock wastewater and the effect of gamma ray irradiation were evaluated. As results, for the pH variation, the $NH_4{^+}$ removal efficiency showed the highest, 88%, at pH 9~9.25. The removal efficiency of $NH_4{^+}$, $Mg^{2+}$ and $PO{_4}^{3-}$ was showed highest when same molar ratio of $Mg^{2+}$ and $PO{_4}^{3-}$ were applied. The $NH_4{^+}$ removal efficiency showed 82% at $7^{\circ}C$, and 90% at $30^{\circ}C$ with temperature. When the wastewater was irradiated with 20 kGy of gamma ray, $NH_4{^+}$ was removed as much as 83%.