傳統去除水中砷離子的技術主要為混凝配合沉澱和過濾及其衍生方法，但生成高濃度的含砷污泥衍生後續處理與處置問題。元素鐵之新穎處理程序已被用以處理水中砷離子，且為加速反應速率，以鐵為本之技術已進入奈米化階段，多數研究皆以管柱方式進行處理以避免顆粒細小之奈米級元素鐵因沉降不易而流失，但因奈米顆粒細小管柱孔隙度甚低而有阻塞之問題。
本研究利用自行合成之奈米級零價鐵作為處理實廠及人工含砷廢水，探討全程控制不同pH值及曝氣條件下，利用奈米級零價鐵連續分批反應槽處理高濃度含砷廢水之去除情形。並在反應的過程中一併分析溶液中 pH、DO、ORP、Fe2+、硝酸鹽氮、亞硝酸鹽氮、氨氣、氨氮及總鐵濃度等參數，作為探討砷離子與零價鐵細部反應作用機制之依據。
研究結果發現以全程控制pH=5.4並持續曝氣的條件下，奈米級零價鐵在實廠廢水方面，砷的去除效率在第一批次可達53％；在人工含砷廢水方面，砷的總去除效率約有54％；在人工含砷及硝酸鹽氮廢水方面，砷的總去除效率約有75％，其去除率優於只有單獨含砷離子的模擬廢水，推測此係硝酸鹽氮於反應槽中與奈米級零價鐵反應形成更多具吸附砷離子的鐵氧化合物所致。 Traditional processes for the removal of arsenic focus on the precipitation, filtration, and their derivatives. However, the treatment and disposal of the arsenic sludge still a problem. Innovative technology for arsenic removal by zero-valent iron（ZVI） has been investigated. To increase the reaction rate, nanosized iron particle has been synthesized and applied for the removal of arsenic. Due to the difficulty of iron sedimentation, most studies use column as the reactor. However, there is still problem of clogging and lower reaction rate caused by oxygen limitation.
The aim of this study is to realize the removal efficiency of high arsenic concentration industrial wastewater and high arsenic concentration simulated wastewater treated by nano zero valent iron (NZVI) in a sequential batch reactor assisted with the electric-magnetic field, The effects of different solution pH and aeration condition on the removel of arsenic and nitrate were evaluated. The solution pH、DO、ORP、Fe2+、nitrate、nitrite、aqueous ammonia、ammonia gas and total iron were also monitored and analyzed.in the
Based on the results of experiment , it was found that the removal of arsenic was 53 % in the first run , with the solution aeration by air and pH controlled continuously at 5.4, The removal of arsenic in the simulated wastewater was 54 % in the first run, in the aeration experiments when the solution was controlled continuously at 5.4, In addition the removal of arsenic in the simulated wastewater spiked with arsenic and nitrate under the same experiment conditions was 75% in the first run. It was proposed that the enhancement of arsenic removal, resulted from the much more formation iron oxide, which was the product of ZVI reacted with nitrate.
