【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9 mg.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.更多还原

【Abstract】 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 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) by 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.更多还原