沸石处理高氟水实验研究

为研究原水含氟浓度、pH值、吸附时间等因素对沸石除氟的影响,采用静态和动态两种方法进行沸石处理高氟水实验。结果表明:沸石吸附氟离子适宜的pH值为6～8,溶液的氟离子浓度越高,沸石的平衡吸附量越大,25℃时按Langmuir吸附等温式拟合为qe=0.0078Ce/(1+0.0767Ce),按Freundlich吸附等温式拟合为qe=0.0114Ce0.4897;沸石吸附柱越高,穿透时间越长,处理水量也越大;进水流速越低,吸附柱有效运行周期就越长。沸石柱经再生可重复使用。

Experimental study on treatment of high-fluoride water through zeolite

The factors influencing the defluorinating capacity of activated zeolite, including fluorine concentration, pH value, and absorption time, were studied. The results indicated that the appropriate pH value was 6 to 8 for the fluorion adsorption of zeolite. The higher the initial concentration of fluorion was, the larger the equilibrium absorption of zeolite. At 25 ℃ the equilibrium adsorption process could be described by the Langmuir adsorption isotherm, qe = 0.0078 Ce/（ 1 ＋ 0.0767Ce）, and the Freundlich adsorption isotherm, qe = 0.011 4Ce^0.4897. When the height of the column of zeolite was high, the penetration time increased and the amount of water treated was larger. The effective operation period of zeolite was longer when the flow rate of the raw water was low. The columniation of zeolite can be reused after regeneration.