固体生物聚合硫酸铁的制备及其结构和性能研究

ThePreparation,Structure and Performance Study of Soild Bio-polymeric Ferric Sulfate

以微生物为催化剂结合喷雾干燥技术制备了固体生物聚合硫酸铁(Solid:Bio-Polymeric Ferric Sulfate,SBPFS);在优化喷雾干燥技术条件的基础上,对SBPFS进行了改性研究,并利用多种现代化手段对SBPFS进行了表征。研究表明:制备SBPFS的最优喷雾干燥技术条件是进风量2.75 m^3/min、干燥温度220℃、进料速度1100 ml/h;最佳改性[SO_4^(2-)]:[Fe]=1:1.20-1:1.40、盐基度为10.46;产品呈内空球状颗粒,外表覆盖着褶皱状的生物质薄膜;SBPFS为复杂的非晶态无定型羟基桥连铁(Ⅲ)聚合物,聚合物内有配位水分子存在。产品理化指标符合国家标准,混凝效果优异,对水中浊度和COD_(Mn)的去除满足电厂补给水预处理要求。

The solid bio-polymeric ferric sulfate（SBPFS） has been prepared via spray drying technology, using microorganism as a catalyst. Based on the optimization of spray drying technology condition, several researches have been carried out to modify SBPFS in order to improve its flocculation performance. SBPFS has also been analyzed by a variety of characterization methods subsequently. The results show that the optimal supply air rate, drying temperature and feedstock speed are 2.75 m3/min, 220 ℃ and 1100mL/h, respectively. The optimal modified [SO2-4]/[Fe]and basicity are 1 ： 1.20-1 ： 1.40 and 10.46 for the modification of SBPFS. Addi- tionally,SBPFS with hollow sphere structure is composed of amorphous hydroxyl bridging iron（Ⅲ） polymer 3 withcoordination water molecules. The crinkled surface is due to the presence of flexible and thin biomass film. Furthermore, the physicochemical indicators of SBPFS conform to the National Standard, and the removal rate of turbidity and CODMn is able to meet the demands of make-up water pretreatment in power plant.