聚合氯化铝对高岭土混凝作用的研究

发布时间：2019-01-27 19:25

【摘要】：聚合氯化铝广泛用于给水混凝处理中。但在不同水质条件下其混凝效果报导不一。本文在PACl水解絮凝体系特性的研究基础上，，使用实验室自制PACl混凝高岭土悬浊液，研究了配水水质、不同高岭土粒径等因素对PACl混凝高岭土悬浊液后Zeta电位、粒径分布及浊度去除率的影响。 研究发现：(一)自制PACl在最佳投加量下混凝纯水配制的小粒径高岭土效果较差，浊度去除率最好为B=2.5的PAC在pH=9时混凝悬浊液，达到14.89%；使用PACl混凝自来水配水水样的除浊效果较好，浊度去除率最大值出现在pH=9处，去除率最大为45.3%；一定量的NaCl与CaSO4加入纯水配制的高岭土悬浊液后略能提高混凝效果。(二)投加量均为0.04mM时，PACl混凝平均粒径2.7μm高岭土悬浊液的浊度去除率与混凝平均粒径489nm高岭土悬浊液的浊度去除率相差不大，而当增大PACl的投加量为0.4mM，提高pH至9时，混凝的浊度去除率可达到较大值91.79%；在pH=8时，HA的加入对浊度去除率略有降低，并且HA投加量越大，混凝效果越不好；10mg/L的硫酸根的加入可提高混凝除浊率；在pH=9，PACl投加量达到0.2mM时其浊度去除率已达到86.95%，投加量增大至0.4mM，其浊度去除率达到93.7%；混凝不同浊度的悬浊液，其浊度去除率随浊度变化不大。(三)工业PACl混凝小粒径高岭土的除浊效果比自制PACl混凝效果更差。
[Abstract]:Polyaluminium chloride is widely used in coagulation treatment of feed water. But under different water quality conditions, the effect of coagulation is different. Based on the study of the characteristics of PACl hydrolytic flocculation system, the effects of water quality and particle size of PACl coagulation kaolin suspension on Zeta potential after PACl coagulation kaolinite suspension were studied by using laboratory self-made PACl coagulation kaolin suspension. Effect of particle size distribution and turbidity removal efficiency. The results are as follows: (1) the effect of small diameter kaolin prepared by self-made PACl at the best dosage is poor, and the turbidity removal rate is best for PAC with BX 2.5 at pH= 9, reaching 14.89; The turbidity removal effect of PACl coagulated tap water sample was better, the maximum turbidity removal rate appeared at pH=9, and the maximum removal rate was 45.3.The addition of a certain amount of NaCl and CaSO4 into kaolin suspension prepared by pure water could slightly improve the coagulation effect. (2) when the dosage of PACl was 0.04mM, the turbidity removal efficiency of PACl coagulating average diameter of 2.7 渭 m kaolin suspension was not different from that of 489nm kaolin suspension, but when the dosage of PACl was 0.4 mm, With the increase of pH to 9, the turbidity removal rate of coagulation can reach a larger value of 91.79. At pH= 8, the turbidity removal rate decreased slightly with the addition of HA, and the coagulation effect was worse with the increase of HA dosage, and the turbidity removal rate of coagulation was increased with the addition of sulfate of 10mg/L. When the dosage of pH=9,PACl reached 0.2mM, the turbidity removal rate reached 86.95%, and the turbidity removal rate increased to 0.4mMand the turbidity removal rate reached 93.7.The turbidity removal rate of the suspended turbidity solution with different turbidity coagulated had little change with turbidity. (3) the turbidite removal effect of industrial PACl coagulation with small diameter kaolin is worse than that of self-made PACl.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU991.2

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