污水处理过程中添加除氟剂后氟离子检测值与真实值出现差异的原因研究
Study on the Reasons for the Difference between the Measured and Real Values of Fluoride Ion Content after Addition of Defluorinating Agent in Wastewater Treatment Process

水体中的氟(F)含量超标，会严重影响人体健康，所以含氟废水的排放有严格标准。本文采用石灰乳除氟 + 除氟剂除氟 + 吸附除氟的三级工序对工业含氟废水进行处理后，氟离子浓度下降至0.2 mg/L左右。但同时发现除氟后的水样氟离子检测浓度升高，经实验发现这种现象与除氟过程中加入的除氟剂有关。当Al、Fe离子存在时，氟离子检测浓度与真实浓度会出现较大偏差，而检测时加入的掩蔽剂作用有限。Al、Fe、Ca离子存在时，温度的变化也会影响氟离子的检测。
Excessive fluoride (F) content in water bodies can seriously affect human health, so there are strict standards for the discharge of fluoridated wastewater. In this paper, the fluoride ion concentration decreased to about 0.2 mg/L after the treatment of industrial wastewater by the three-stage process of lime emulsion + defluoridation agent + adsorption. However, it was found that the fluoride ion concentration of water samples increased after defluoridation. This phenomenon was related to the defluorinating agent added. Al and Fe ions in the defluorinating agent would cause large deviations between the detected values and the true values, while the masking agent added to the detection has a limited effect. The change of temperature in the presence of Al, Fe and Ca ions would also affect the detection of fluoride ions.