本文报告了三种铝盐混凝沉淀与混凝沉淀加过滤工艺降氟的试验结果。铝盐一般适合含氟量小于4mg/L的原水降氟氟。降后的混凝剂沉渣不会因为浸泡而向水中释放F~-,且可重复利用1～2次,并能节约混凝剂用量16％左右。混凝沉淀加过滤的降氟工艺的卫生效益和经济效益均优于单纯沉淀工艺,其出水中的F~-<1.0 mg/L,浊度<0.10NTU,Al~(+3)<0.20 mg/L。 This paper reports the experimental results of three kinds of aluminum salt coagulation precipitation and coagulation sedimentation plus filtration process fluoride reduction. Aluminum salt is generally suitable for fluorine content less than 4mg / L of raw water fluoride fluoride. After falling coagulant sediment will not be released into the water because of soaking F ~ -, and can be reused 1 or 2 times, and can save about 16% coagulant dosage. The results of coagulation sedimentation and filtration showed that the fluoride removal efficiency was better than that of pure precipitation process, the effluent water F ~ - <1.0 mg / L, turbidity <0.10 NTU, Al ~ (+3) <0.20 mg / L.