- 學位論文
六價鉻對Bardenpho程序污泥降解碳、氮抑制效應之研究
The Inhibitory Effect of Hexavalent Chromium on Carbon and Nitrogen Degradation in Bardenpho Activated Sludge Process
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摘要
摘要 近年來，隨著工業發展廢水大量的排放，在工業廢水中常含有 Pb、Cr、Zn、Cu、Fe、Hg、Cd 等重金屬，由於活性污泥受到重金屬抑制，容易使處理效果不佳，進而造成水體污染，因此瞭解廢水處理程序中重金屬之轉化與傳輸行為，可加強廢水處理效益。本研究利用朝陽科技大學 Bardenpho 模廠培養之污泥模擬廢水處理廠對污泥的影響，求得廢水處理廠中重金屬廢水對微生物抑制率影響及微生物受抑制相關參數，結果顯示，在異營菌降解有機物方面於加入六價鉻濃度分別為 0、0.5、1、2、4 mg L-1時，六個小時內平均每小時降解 COD 分別為 26.28、20.34、17.33、17.04、23.61 mg L-1。在氨氮氧化菌降解 NH3-N 方面，六個小時內平均降解 NH3-N 量分別為 5.41、4.27、3.94、3.47、2.17 mg L-1。在亞硝酸氮氧化菌降解 NO2-N 方面，六個小時內平均降解 NO2-N 量分別為 2.02、1.80、1.62、1.33、0.81 mg L-1。無添加六價鉻之 XH 在 0 至 6 小時有明顯的降解趨勢，而添加六價鉻後，可發現降解速度有明顯被抑制之情形，其中添加 4 mg L-1 之六價鉻抑制效果較為顯著。結果顯示，六價鉻濃度越高，抑制效果越明顯。
並列摘要
Abstract Due to the discharge of a high amount of industrial wastewater in recent years, the heavy metals contained in industrial wastewater, such as Pb, Cr, Zn, Cu, Fe, Hg and Cd, have suppressed the active sludge and affected the treatment effect, thus causing pollution to the water body. Therefore, understanding the conversion and transport behaviors of the heavy metals in the process of the wastewater treatment could improve the wastewater treatment effect. This study used the sludge cultivated by the Bardenpho Modeling Plant of Chaoyang University of Technology to simulate the influence of the wastewater treatment plant on the sludge, in order to find out the influence of the wastewater containing heavy metals on the rate of the microorganism suppression in the wastewater treatment plant, as well as the parameters related to the microorganisms under suppression. The results indicated that for organism degradation of heterotrophs, when the hexavalent chromium with the concentrations of 0, 0.5, 1, 2 and 4 mg L-1 are added, the average degraded COD within 6 hours are 26.28, 20.34, 17.33, 17.04 and 23.61 mg L-1 respectively. For the NH3-N degradation of ammonia oxidizing bacteria, the average degraded NH3-N amount within 6 hours are 5.41, 4.27, 3.94, 3.47 and 2.17 mg L-1 respectively. For the NO2-N degradation of nitrite oxidizing bacteria, the average degraded NO2-N amount within 6 hours are 2.02, 1.80, 1.62, 1.33 and 0.81 mg L-1. There is an obvious degradation trend between 0 to 6 hours for XH without the addition of hexavalent chromium. This study found that the degradation speed is obviously been suppressed after the hexavalent chromium is added. The suppression effect is more obvious when 4 mg L-1 of hexavalent chromium is added. The results showed that higher hexavalent chromium concentration leads to more obvious suppression effect.
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