| 固液共存氧化型聚硅酸铁(PSF-I)混凝剂的分析 |
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| 中文关键词 聚硅酸铁 氧化改性 固液共存 紫外扫描 混凝性能 |
| 英文关键词 PSF oxidative modification solid-liquid UVA spectrum coagulation efficiency |
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| 中文摘要 |
| 对自制的聚硅酸铁(PSF)进行改性，加入高锰酸钾和稳定剂M，制备出固液共存氧化型聚硅酸铁(PSF-Ⅰ)混凝剂，用滤纸将PSF-Ⅰ过滤，并对PSF-Ⅰ、PSF-Ⅰ滤液及PSF进行紫外吸收(UVA)全波长扫描及前两者的混凝实验，然后将PSF-Ⅰ与PSF、聚合硫酸铁(PFS)进行混凝对比研究，最后对PSF-Ⅰ的混凝性能随储存时间的稳定性进行探讨。结果表明，高锰酸钾的加入改变了PSF的微观结构，使PSF的形态尺寸增大，导致PSF-I中Fe3+离子的UVA特征峰比PSF高，并且保存了独立的高锰酸钾特征吸收峰(530nm)。PSF-Ⅰ中的固相起到初级核子作用，有利于絮体成长。PSF-Ⅰ的最佳投药量为9mg?L-1，而PSF-Ⅰ滤液 的最佳投药量为12 mg?L-1。PSF-I是通过混凝吸附和催化氧化功能共同实现对有机物的去除，而PSF和PFS仅是通过常规的混凝吸附去除部分有机物，去除机理有本质的区别。 |
| 英文摘要 |
| A new type of inorganic coagulant, solid-liquid oxidative poly silicic ferric sulfate(PSF-I) ,was prepared by adding KMnO4 and stabilizer M to poly silicic ferric sulfate(PSF).The species characteristics of PSF-I, the filtrate of PSF-I and PSF with Spectrophotometer, and coagulation performance of PSF-I and the filtrate of PSF-I with jar tests were explored, respectively. Coagulation efficiency of PSF-I was studied compared to that of PSF and poly ferric sulfate (PFS), and the effect of storage time on coagulation performance of PSF-I was investigated. The results show that KMnO4 added to PSF modifies the microstructure of PSF, increasing species size of PSF and making UVA characteristic peaks of Fe3+ ion in PSF-I more higher than that in PSF. There exists KMnO4 unattached in PSF-I. The solid phase in PSF-I is a kind of primary nucleus for building up flocs. The optimal dosage with PSF-I is 9 mg?L-1, in comparison with 12 mg?L-1 with PSF-I filtrate. The removal of natural organic matters (NOM) is not only caused by adsorption/charge-neutralization and co-precipitation but also by oxidization using PSF-I as coagulant, while to PSF and PFS, adsorption/charge-neutralization and co-precipitation is the only coagulation mechanism. |
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