铝盐混凝法去除氟离子的一般作用规律

通过混凝除氟、絮体氟吸附和释放等试验考察了铝盐混凝除氟的作用特,探讨了除氟随铝盐投加量、混凝pH等操作参数及铝盐混凝剂本身形态不同时的变化规律。结果表明，铝盐混凝除氟效果与混凝pH密切相关，在pHo 5.8-7.0条件下除氟效果最佳；在相同投加量和各自的最佳混凝条件下，单体铝盐的除氟效果好于聚合铝盐，但其絮体的持氟性能不及聚合铝盐。

The Characteristics of Fluorine Removal by Coagulation with Aluminum Salts

The characteristics of defluorination by coagulation with aluminum salt coagulants were studied via the jar test and the experiment of fluorine adsorption by and release from flocs.The variation of defluorination efficiency with the change of operation parameters such as coagulant dosage,pH,etc,and different forms of aluminum salt coagulants were investigated.The results show that the defluorination effect of aluminum salt coagulants is very sensitive to coagulation pH,achieving best performance under pH 5.8~7.0.Under the same dosage and optimum coagulation conditions,the defluorination effect of monomeric aluminum salt is better than polyaluminum salts,but the former's floc has a worse ability of remaining fluorine.