聚合铝钛基絮凝剂的合成与应用

Synthesis and application of polymerized Al-Ti based flocculant

聚合铝钛基絮凝剂是一种新型的高分子聚合絮凝剂,研究证明其具有铝盐絮凝剂有机物去除效率高、成本低的优点,也具有钛盐混凝剂低毒性、生物相容性和沉降性能好的优点。研究通过慢速滴碱法与电渗析法制备了两种聚合氯化铝钛絮凝剂(PATC),对两种不同制备方法的PATC进行了絮凝剂结构、絮凝效果以及絮凝动力学三个方面的研究。实验结果表明E-PATC的中、高聚体比S-PATC多3.89%,Zeta电位高8.9 mV。对两者的絮凝动力学进行了对比,发现E-PATC的生长速度快,絮体粒径大,易沉降。综上,E-PATC与S-PATC的絮凝效果相差不大,但E-PATC絮凝产生的絮体粒径大,不易破碎,具有更好的沉降性。

Polyaluminum titanium based flocculant is a new type of composite polymer flocculant,its effect is better than that of aluminum salt flocculant and titanium salt coagulant.The preparation method of composite flocculants has always been slow dropping alkali method,and electrodialysis method is a new preparation method.Electrodialysis can precisely regulate the hydrolysis polymerization of Al3+and Ti4+with OH-microinterface process,so as to obtain hydroxyl polymers with flocculating effect.In order to further understand the preparation mechanism of flocculant and the differences between the two preparation methods.First,the hydrolytic morphology distribution and physicochemical properties of the two flocculants were compared by Ferron time by time complexation colorimetry,FTIR,SEM and Zeta potential.It was found that the medium and high polymer content of E-PATC prepared by electrodialysis method was 3.89%higher than that of S-PATC prepared by slow dropping alkali method,and the Zeta potential was 8.9 mV higher,which indicated that the electric neutralization and sweeping capacity of E-PATC were better than that of S-PATC.Second,the flocculation effect of two kinds of flocculants on Jiazi Lake water and secondary effluent was compared.It was found that the organic removal rate of E-PATC was higher than that of S-PATC in both Jiazi Lake water and secondary effluent.Finally,the floc dynamics of E-PATC was studied.E-PATC had a fast growth rate,a large floc particle size,and was easy to settle.In summary,the flocculation effects of E-PATC and S-PATC are similar,but the floc produced by E-PATC flocculation has a large particle size,is not easily broken,and has better settling properties.