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.
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 silieie 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 mierostrueture of PSF, increasing species size of PSF and making UVA characteristic peaks of Fe^3 ＋ ion in PSF- Ⅰhigher 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 floes. The optimal dosagewith 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- Ⅰas coagulant, while to PSF and PFS, adsorption/charge-neutralization and co-precipitation is the only coagulation mechanism.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2006年第10期2061-2066,共6页
Environmental Science
基金
国家重点基础研究发展规划(973)项目(2004CB418500)
关键词
聚硅酸铁
氧化改性
固液共存
紫外扫描
混凝性能
PSF
oxidative modification
solid-liquid
UVA spectrum
coagulation efficiency
