无机高分子混凝剂聚合硫酸铝铁的制备及其应用研究  

Preparation and Applications of Inorganic Polymer Flocculant Poly Aluminum Ferric Sulfate

作　　者：廖为雄 

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭

出　　处：《环境保护前沿》2017年第5期380-389,共10页Advances in Environmental Protection

基　　金：湖南省研究生科研创新项目(CX2017B642)。

摘　　要：本实验采用FeSO4?7H2O、Al2(SO4)3?12H2O为原料,以浓硝酸为强氧化剂,Na2HPO4为稳定剂,制备出了一种高聚态铁基混凝剂聚合硫酸铝铁(PAFS)。为验证其混凝性能的优劣,将制备出的高分子复合混凝机以有机腐殖酸为对象进行去除实验。考察了反应温度、Al/Fe摩尔比、P/Fe摩尔比和OH/(Fe + Al)摩尔比4个因素对PAFS混凝效果的影响,通过红外光谱对其形态结构进行表征。研究结果表明:当微波引发时间为5 min,反应温度为60?C,合成时间为2 h,Al/Fe摩尔比0.4,P/Fe摩尔比为0.2,OH/(Fe + Al)摩尔比为0.4时,混凝剂的混凝性能最优。红外光谱分析表明,PAFS中含有以羟基桥联的铁和铝的聚合物,使得混凝剂具有较好的絮凝效果。且将PAFS用于处理腐殖酸溶液时,当快搅速度为350 rpm,快搅时间为3 min,慢搅速度为40 rpm,慢搅时间12 min,混凝剂投加量12.8 mg/L,pH为8时,腐殖酸去除率达到81%,且存在一定浓度的Mn2+可以提高PAFS对腐殖酸的去除效果。In this paper, FeSO4?7H2O and Al2(SO4)3?12H2O were taken as the raw material, concentrated nitric acid as a strong oxidant and Na2HPO4 as stabilizer to produce poly aluminum ferric sulfate (PAFS) flocculants. In order to test the coagulation effect, the flocculants was applied to the removal of organic humic acid. The coagulation effect was examined with an emphasis on reaction temperature, Al/Fe molar ratio, P/Fe molar ratio and OH/(Fe + Al) mole ratio. The structure and morphology of PAFS were characterized by means of Fourier transform infrared spectrophotometer (FTIR). The results show that the product have the best coagulation effect when the microwave initiation time, reaction temperature, reaction time, Al/Fe molar ratio, P/Fe molar ratio and OH/(Fe + Al) molar ratio are 5 min, 60?C, 2 h, 0.4, 0.2 and 0.4, respectively. Infrared spectrum analysis shows that PAFS containing hydroxyl polymer bridging of iron and aluminum, makes a better coagulation performance. The removal rate of humic acid reachs 81% when the dosage of PAFS is 12.8 mg/L, pH value is 8, rapid stirring speed is 210 rpm, fast mixing time is 3.0 min, the slow stirring speed is 50 rpm and slow stirring time is 12 min. With the concentration of Mn2+, the removal efficiency of humic acid and fulvic acid increased.

关 键 词：无机高分子混凝机 聚合硫酸铝铁 腐殖酸 絮凝性能 

分 类 号：X7[环境科学与工程—环境工程]