腐植酸與金屬離子對微米級零價鐵還原處理硝酸鹽之影響

Effects of Humic Acid and Metal Ions on the Removal of Nitrate by Microscale Zero-Valent Iron

本研究探討不同金屬離子Fe（上標 2+）與Cu（上標 2+）、腐植酸與起始pH值對微米級零價鐵（Fe^0）還原處理水中硝酸鹽的影響。實驗結果發現在未控制pH下，分別添加1.0mM Fe（上標 2+）和Cu（上標 2+）時，還原處理硝酸鹽效果明顯高於未添加金屬離子時。在控制pH下，有無添加Fe（上標 2+）對還原硝酸鹽氮並沒有顯著的影響，而添加Cu（上標 2+）則有較顯著的影響。添加腐植酸於未控制pH及pH2溶液中雖會增加零價鐵的還原能力，但其效果並不顯著。比較本研究探討的控制因素發現，控制起始pH值為影響微米級零價鐵對硝酸鹽去除效果之主要因素。

The aim of this study is to explore the effects of both humic acid and different metal ions （such as Fe（superscript 2+） and Cu（superscript 2+）） on the reduction of nitrate under various initial pH. Results indicate that the removal of nitrate could be enhanced by dosing Fe（supetscript 2+） or Cu（superscript 2+） under uncontrolling initial pH. However, additional dosing of Cu（superscript 2+） could enhanced the removal of nitrate more than Fe（superscript 2+）. The dosing of humic acid have insignificant effect on the removal of nitrate. It could be noted that the main controlled factor of the removal of nitrate by microscale iron was initial pH.