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采用改性灰岩作为除氟材料,通过批实验和柱实验,考察不同条件下的除氟效果,并探讨了其实际应用的可能性。结果表明:FeCl3溶液联合灰岩除氟,可使高氟水中的氟浓度达到国家饮用水标准,在含氟水样中加灰岩后,直接加FeCl3会促进灰岩对氟的去除效率。在氟离子浓度为5 mg/L,粒径0.2～0.5 mm的灰岩为1 g的条件下,铁离子含量为0.016 mmol/L时,即可达到去除的最佳效果,除氟率可达95.74%。柱实验说明在FeCl3溶液浓度一定时,除氟率随着总出水量的增加而提高;填充的灰岩总量不变时,随着FeCl3溶液浓度的增加,除氟效果明显增加,说明本实验具有实际应用的可能性。
The modified limestone was used as a fluoride removal material. The batch experiment and column experiment were carried out to investigate the effect of fluoride removal under different conditions. The possibility of its application was also discussed. The results showed that the combination of FeCl3 and limestone could make the fluorine concentration in high-fluorine water meet the national standard of drinking water. Adding limestone directly into the fluorine-containing water sample could promote the fluoride removal efficiency of limestone. Under the condition of 1 g limestone with fluoride ion concentration of 5 mg / L and particle size of 0.2 ~ 0.5 mm, the best removal effect can be achieved when the iron ion content is 0.016 mmol / L, and the removal rate of fluoride is up to 95.74%. The results of column experiments show that when the concentration of FeCl3 solution is constant, the removal rate increases with the increase of the total amount of effluent. When the total amount of limestone is constant, the effect of fluoride removal increases with the increase of FeCl3 concentration. Practical possibilities.