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对比研究了Al Cl3和3种不同碱化度的聚合氯化铝(PACl)在不同p H与投量下除氟效果,并对不同形态铝盐除氟机理进行了初步探讨。结果表明,p H对絮凝剂水解后铝形态分布及其除氟效果有重要影响。p H 5~6时,Al3+和Al2、Al3等低聚态铝为Al Cl3主要形态,且Al Cl3更易水解生成可将溶解态氟转化为颗粒态氟的A1(OH)3,从而较PACl具有更佳除氟效果。p H>7时,PACl较Al Cl3具有更佳除氟效果,且增大PACl碱化度可促进氟的去除,这主要是由于具有较高Al13含量的PACl更容易与电负性F-结合所致;且絮凝剂混凝除氟絮体ζ电位越高,越利于F-在絮体表面吸附。
The effects of Al Cl3 and three kinds of polyaluminum chloride (PACl) with different levels of p H on the fluoride removal were compared and the mechanism of fluoride removal in different forms of aluminum salts was discussed. The results show that p H has an important effect on the distribution of the aluminum species after the hydrolysis of the flocculant and its effect of removing fluoride. When p H 5 ~ 6, Al 3+ and Al 2, Al 3 and other oligomeric aluminum are the main forms of Al Cl 3, and Al Cl 3 is more easily hydrolyzed to form Al (OH) 3 which can convert dissolved fluorine into particulate fluorine, Better fluoride effect. When p H> 7, PACl had a better fluoride removal effect than AlCl3, and increasing the degree of alkalization of PACl could promote the removal of fluorine, which was mainly attributed to the fact that PACl with higher Al13 content was more easily bound to electronegative F- Due to the flocculant flocculation fluoride floc ζ potential higher, the more favorable to the F-adsorption on the floc surface.