镁铁复合絮凝剂的表征及应用研究

以FeSO4、MgO和H2SO4为原料,制备了新型镁铁复合絮凝剂(PFMS),考察了PFMS的结构和Fe(Ⅲ)分布形态,为了考察自制PFMS、自制聚合硫酸铁(PFS)与工业PFS产品的絮凝性能差别,选择高岭土模拟浊度废水、直接耐晒黑G模拟染料废水和焦化废水生化出水,分别进行了去除浊度、色度和COD的絮凝实验.结果表明,Mg2+未参与聚合过程,但引入Mg2+提高了PFMS的稳定性.PFMS对浊度去除效果略高于自制PFS和工业PFS,余浊<5NTU;在碱性条件下,PFMS的脱色率、COD去除率高于自制PFS和工业PFS.

Experimental research on the characterization and application of Mg-Fe composite flocculant.

A new PFMS composite flocculant was prepared by ferrous sulfate (FeSO₄), magnesium oxide (MgO) and sulfuric acid (H₂SO₄). The structure and iron distribution of the product were investigated. The magnesium ion didn’t participate in the polymerization process, but it improved the stability of the product. In order to study the flocculation performance difference between self-made PFMS/PFS and industrial PFS, the simulated turbidity wastewater by kaolin, the simulated dye wastewater by direct fast black G and the coking wastewater were chosen to carry out the coagulation experiment of removing turbidity, color and COD, respectively. The turbidity removal efficiency by PFMS was a little higher than that of the self-made and industrial PFS, and the residual turbidity was below 5 NTU. In alkaline conditions, the decoloration rate and COD removal rate by PFMS were higher than that of the self-made and industrial PFS.