以元素鐵為主之新穎系統處理受硝酸鹽污染地下水之操作分析

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標題:	以元素鐵為主之新穎系統處理受硝酸鹽污染地下水之操作分析 Operation analysis of innovative Fe0-based system for nitrate-contaminated groundwater treatment.
作者:	李俊儀
貢獻者:	廖志祥嘉南藥理科技大學：環境工程與科學系曁研究所
關鍵字:	空氣曝氣法空氣打氣機銨離子(NH4+) Micro size of zero valent iron(Fe0) Ferrous iron (Fe2+) Ammonium iron(NH4+) Air stripping Air pump Sodium hydroxide (NaOH) Iron oxide coated quartz sand
日期:	2009
上傳時間:	2010-06-08 13:54:38 (UTC+8)
摘要:	摘要在此項研究中，對於使用創新的元素鐵系統來處理受硝酸鹽污染的地下水是一項新穎的技術，此系統是綜合化學單元的還原作用和物理單元的吸附及曝氣作用，來處理受硝酸鹽污染物污染的地下水。其原因是因為微米級元素鐵(Fe0)易取得，價格不是非常昂貴，對於水中的硝酸鹽去除效率亦佳，所產生的二價鐵(Fe2+)，可以石英砂使其吸附，而對於系統所產生的銨離子(NH4+)亦能使用空氣曝氣法去除，使得排放水符合標準，空氣曝氣的優點是，所需之空氣可以利用空氣打氣機直接打入水中，不需特別訂購特殊氣體，成本上就節省釵h。而第三項的優點是所產生的氧化鐵覆膜石英砂能回收再利用，亦符合環保概念，因為它能夠被用來去除有機化合物以及其它污染，對於污染物的去除有所助益，所以本系統使用的耗材都是一些方便取得的物品，對於節省成本及環保上的考量，是不錯選擇。產生的氧化鐵覆膜石英砂能回收再利用，並利用簡單的曝氣單元，解決所產生的副產物問題，並找出系統的最適條件，來達到系統操作的最佳效果。在硝酸鹽去除單元發現，在元素鐵劑量240 g以及二氧化碳流量800 ml/min的時候可以達到94.3 %去除效果，而在亞鐵離子去除單元發現，如果將壓縮機空氣入口加裝乾燥瓶並將空氣流量由5 L/min 變成2 L/min 將能降低流體化過程中造成的剪力以及空氣流量計不穩的問題。而在銨離子去除單元，如果可以改善氫氧化鈉(NaOH)的穩定添加量並且穩定控制在pH值12，足夠的空氣流量以及曝氣面積將能得到較佳的排放水氨氮含量，並且控制二氧化碳的在碳酸化流量約為100 mL/min，除了可以節省成本還能得到較接近原水的酸鹼值。 Abstract In this study, the use of innovative elements for the system to deal with nitrate pollution of groundwater by a new technology, this system is an integrated unit to restore the role of chemical and physical adsorption and aeration unit role to deal with by Nitrate pollution of groundwater. The reason is because the micro size zero-valent iron (Fe0) easy to obtain, the price is not very expensive for the nitrate removal efficiency in the water also good, and the ferrous iron (Fe2 +), can be adsorbed to quartz sand, and the system generated by Ammonium (NH4 +) can use air stripping, allows the standards of drainage water, the advantages of air aeration is required for the air can encourage the use of air pump directly into the water, Special orders do not need a special gas, save on the cost. The third advantage of the oxide film produced by quartz sand can be recycled, is also in line with the concept of environmental protection because it can be used to remove organic compounds and a number of pollution, for the removal of pollutants be useful, so use of the system to facilitate access to supplies of goods, the savings in cost and environmental considerations, is a good choice. Produced by iron oxide coated quartz sand can recycling and the use of simple aeration unit, solve the problem of by-products generated, and to identify the optimal conditions for the system to achieve the system the most great operation condition. Found in the nitrate removal units, in the 240 g dosege of zero-valent iron and carbon dioxide flow rate of 800 ml / min can be achieved when the removal efficiency 94.3%, while the removal of ferrous ions in the unit found that if the entrance to the equipment of dry air compressor bottle and the air flow rate from 5 L / min to 2 L / min will be able to reduce the fluid caused by the process of shear instability and the problem of air flow meter. Removal of ammonium in the unit, if it is possible to improve the sodium hydroxide (NaOH) addition of stability control and stability in the pH value of 12, sufficient air flow and aeration of the area will be able to better discharge ammonia content of water, and control carbon dioxide in recarbonate flow of about 100 mL / min, in addition to cost savings could be closer to the raw water pH.
關聯:	校內外完全公開，學年度：97，140 頁
顯示於類別:	[環境工程與科學系(所)] 博碩士論文

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