In this study, the nitrogen compounds in wastewater were removed by using an electrolysis device. The operation conditions were investigated by electrolysis of synthetic wastewater. First, nitrate synthetic wastewater was electrolyzed with various cathodes and an anode of Pt-Ti. The effect of chlori...
In this study, the nitrogen compounds in wastewater were removed by using an electrolysis device. The operation conditions were investigated by electrolysis of synthetic wastewater. First, nitrate synthetic wastewater was electrolyzed with various cathodes and an anode of Pt-Ti. The effect of chloride ions(Cl-) was also investigated. The reduction of nitrate nitrogen, the production of free chlorine, and the removal of ammonia nitrogen were compared. Secondly, the ammonia nitrogen synthetic wastewater was electrolyzed and the removal efficient of ammonia nitrogen was compared by varying the concentration of chloride ion (Cl-) and different pH conditions. Thirdly, synthetic wastewater containing nitrate and ammonia nitrogen, which is similar to real food wastewater concentration, was electrolyzed. Changes in pH, NO3-N, NH3-N and TN were evaluated by electrolysis of food waste wastewater with different initial pH. The nitrate synthetic wastewater was electrolyzed using Pt-Ti as the anode and Cu, Zn, Fe, Brass, SUS, Al, and Ni as the cathodes in order to evaluate the performance of each type of cathode. Cu, Zn, Fe and Brass were confirmed as suitable electrodes for electrolysis. The amount of free chlorine was increased when concentration of Cl- was increased up to 8.5 mM. The amount of free chlorine was not significantly increased when the Cl- concentration was increased to 8.5 mM or greater. The removal efficient of ammonia nitrogen was increased as the concentration of Cl- was increased. Ammonia nitrogen was not removed by free chlorine produced by electrolysis when pH was lower than pKa value. The NH3-N of 1613 mg N / L (80 %) was removed from 2000 mg N /L ammonia nitrogen synthetic wastewater when pH adjusted to 12. NO3-N 161 mg/L(99 %), NH3-N 1225 mg/L(94 %) and TN 3638 mg/L (86 %) were removed in the food wastewater of 100 L for 24 hours by electrolysis. In the case of ammonia nitrogen and total nitrogen, the change of concentration was not significant for 5 hours. In food wastewater with pH adjusted to 12, NO3-N 161 mg/L(99 %), NH3-N 1232 mg/L(94 %) and TN 3734 mg/L (88 %) were removed. Compared with non-pH controlled food wastewater, it was removed as much as 1480 mg N/L(35 %) by 12 hours.
In this study, the nitrogen compounds in wastewater were removed by using an electrolysis device. The operation conditions were investigated by electrolysis of synthetic wastewater. First, nitrate synthetic wastewater was electrolyzed with various cathodes and an anode of Pt-Ti. The effect of chloride ions(Cl-) was also investigated. The reduction of nitrate nitrogen, the production of free chlorine, and the removal of ammonia nitrogen were compared. Secondly, the ammonia nitrogen synthetic wastewater was electrolyzed and the removal efficient of ammonia nitrogen was compared by varying the concentration of chloride ion (Cl-) and different pH conditions. Thirdly, synthetic wastewater containing nitrate and ammonia nitrogen, which is similar to real food wastewater concentration, was electrolyzed. Changes in pH, NO3-N, NH3-N and TN were evaluated by electrolysis of food waste wastewater with different initial pH. The nitrate synthetic wastewater was electrolyzed using Pt-Ti as the anode and Cu, Zn, Fe, Brass, SUS, Al, and Ni as the cathodes in order to evaluate the performance of each type of cathode. Cu, Zn, Fe and Brass were confirmed as suitable electrodes for electrolysis. The amount of free chlorine was increased when concentration of Cl- was increased up to 8.5 mM. The amount of free chlorine was not significantly increased when the Cl- concentration was increased to 8.5 mM or greater. The removal efficient of ammonia nitrogen was increased as the concentration of Cl- was increased. Ammonia nitrogen was not removed by free chlorine produced by electrolysis when pH was lower than pKa value. The NH3-N of 1613 mg N / L (80 %) was removed from 2000 mg N /L ammonia nitrogen synthetic wastewater when pH adjusted to 12. NO3-N 161 mg/L(99 %), NH3-N 1225 mg/L(94 %) and TN 3638 mg/L (86 %) were removed in the food wastewater of 100 L for 24 hours by electrolysis. In the case of ammonia nitrogen and total nitrogen, the change of concentration was not significant for 5 hours. In food wastewater with pH adjusted to 12, NO3-N 161 mg/L(99 %), NH3-N 1232 mg/L(94 %) and TN 3734 mg/L (88 %) were removed. Compared with non-pH controlled food wastewater, it was removed as much as 1480 mg N/L(35 %) by 12 hours.
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