氟化物
化学
X射线光电子能谱
流出物
废水
电化学
电凝
降水
石灰
凝结
离子
无机化学
核化学
电极
材料科学
冶金
化学工程
废物管理
物理化学
有机化学
气象学
工程类
物理
精神科
心理学
作者
Feng Shen,Xueming Chen,Ping Gao,Guohua Chen
标识
DOI:10.1016/s0009-2509(02)00639-5
摘要
Fluoride ions were removed electrochemically from a solution using a combined electrocoagulation and electroflotation process. For an influent fluoride concentration of 15mg/l, a value after lime precipitation, the effluent fluoride concentration can be lower than 2mg/l when the pH in the coagulation cell is around 6, charge loading is at 4.97F/m3 water, and the residence time is 20min. Even lower effluent concentration can be achieved if 50mg/l of Fe3+ or Mg2+ are added into the coagulation unit. The anions generally reduce the fluoride removal efficiency except Cl− whose corrosion pitting of the electrode can result in 130% current efficiency. The composition of the sludge produced from the operation was analyzed using X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectroscope system (ToF-SIMS). The characterization results show that the defluorination is a chemical adsorption process with F− replacing the –OH group from the Aln(OH)3n flocs.
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