電膠羽浮除法去除廢水中氟離子之研究

Fluoride Removal from Wastewater by Electro-coagulation-flotation Process

胡景堯(Ching-Yao Hu)

指導教授 ： 駱尚廉

國立臺灣大學/工學院/環境工程學研究所/博士(2005年)

https://doi.org/10.6342/NTU.2005.02073

摘要

中文摘要
過量的氟離子會對人類或水生生物造成傷害。隨著半導體業的快速發展，如何經濟而有效的處理半導體業產生的大量氟系廢水已成為環工界值得重視的問題。目前最經濟的氟系廢水處理方式為鈣鹽沈澱法，但由於此法須加入過量的鈣鹽，故會大幅升高放流水的硬度。
本論文利用電膠羽浮除法去除水中過量的氟離子，並就其主要去除機制、各種水質參數及電荷負荷對其去氟效果的影響，以及動力模式等方面進行探討。最後再將鈣鹽沈澱法與電膠羽浮除法結合，處理高濃度的含氟廢水。
研究結果顯示：共沈澱反應為鋁鹽混凝去除氟離子的主要機制，當氫氧根離子與鋁離子的莫爾濃度比值（

關鍵字

鈣鹽沈澱法 ； 12烷基磺酸鈉 ； 電膠羽浮除法 ； 氟離子

並列摘要

ABSTRACT
Excessive fluoride in water is toxic for human and aquatics. Owing to the development of the semiconductor industry, how to treat fluoride-containing wastewater produced by the industry efficiently and economically has become an important issue for environmental engineers. Currently, the cheapest way to remove fluoride ions from high-fluoride containing wastewater is to form calcium fluoride (CaF2) by adding excess lime or other calcium salts. However, this process causes the problem of hardness of the effluent water due to over addition of calcium salts.
This thesis used an electrochemical technique, electro-coagulation-flotation process to treat fluoride containing wastewater. The mechanism of fluoride removal by electro-coagulation, the effect of water quality parameters and charge loading on the defluoridation efficiency of the process and the kinetic of the defluoridation are investigated in this study. Finally, the calcium precipitation was combined with the electro-coagulation-flotation process to treat high fluoride containing wastewater with stoichiometric amount of calcium salt.
The results shows coprecipitation is the major mechanism for fluoride removal for aluminum coagulation. The efficiency of defluoridation was approximately 100% when the sum (

並列關鍵字

Electro-coagulation-flotation process ； Calcium precipitation ； Fluoride ； Sodium dodecyl sulfate

參考文獻

Adelung, D., Buchholz, F., Culik, B. and Keck, A., “Fluoride in tissues of krill Euphasia superba Dana and Meganyctiphanes norvegica M. Sars in relation to the moult cycle,” Polar Biol., 7, 45-50 (1987).

Adhikary, S. K., Tipnis, U. K., Harkare, W. P. and Govindan, K. P., “Defluoridation during desalination of brackish water by electrodialysis,” Desalination, 71, 301-312 (1989).

Akitt, J. W. and Elders, J. M., “Multinuclear magnetic resonance studies of the hydrolysis of aluminium(III). Part 8. Base hydrolysis monitored at very high magnetic field,” J. Chem. Soc. Dalton Trans., 5, 1347-1355 (1988).

Alexandrova, L., Pugh, R. J., Tiberg, F. and Grigorov, L., “Confirmation of the heterocoagulation theory of flotation,” Langmuir, 15, 7464-7471 (1999).

Antia, N. J. and Klut, M. E., “Fluoride addition effects on euryhaline phyto-plankter growth in nutrient-enriched seawater at an estuarine level of salinity,” Botanica Marina, 24, 147-152 (1981).