Fluoride Removal from Wastewater by Electro-coagulation-flotation Process
Date Issued
2005
Date
2005
Author(s)
Hu, Ching-Yao
DOI
zh-TW
Abstract
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 (
Subjects
鈣鹽沈澱法
12烷基磺酸鈉
電膠羽浮除法
氟離子
Electro-coagulation-flotation process
Calcium precipitation
Fluoride
Sodium dodecyl sulfate
Type
thesis
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