镁铝复合脱色絮凝剂的微观结构形态及絮凝机制  

Microstructure Morphology and Flocculation Mechanism of the Decolorizing Flocculant Poly-aluminum(Ⅲ) -magnesium(Ⅱ) -sulfate

作　　者：桑义敏[1] 常雪红[1] 车越[1] 谷庆宝[2] 

机构地区：[1]北京石油化工学院环境工程系,环境工程教学与实验中心,北京102617 [2]中国环境科学研究院土壤污染控制实验室,北京100012

出　　处：《环境科学》2013年第9期3502-3506,共5页Environmental Science

基　　金：科技部科研院所技术开发专项(2005-JKZX-314);国家自然科学基金项目(51208040)

摘　　要：通过红外光谱和X-射线衍射研究了镁铝复合絮凝剂(PMAS)的结构形态,通过对渗滤液生化出水的脱色效果和系统Zeta电位的测定,分析了絮凝机制.结果表明:①X-射线衍射和红外结果显示,PMAS是以羟基桥联的铝和镁的复杂多聚物;②PMAS的絮凝机制主要是电中和和网捕卷扫作用.在低投药量时,以吸附电中和作用为主;在高投药量时,随体系pH值不同其絮凝行为而有所变化:酸性条件下以电中和机制为主;碱性条件下以网捕卷扫机制为主;中性条件下则是两种机制共同发挥作用.Crystal structures and morphologic characteristics of poly-aluminum（Ⅲ）-magnesium（Ⅱ）-sulfate（PMAS） were discussed using X-radial diffraction and infrared spectrogram and the flocculation mechanism was explored here based on comparisons between decolorization effect of landfill leachate secondary effluent and the system Zeta potential.The results indicated that PMAS was a kind of macromolecular composite polymer of aluminum and magnesium based on —OH bonding.The flocculation mechanism of PMAS was mainly charge neutralization and co-precipitation netting.Charge neutralization was the main mechanism at low dose.Its flocculation behaviors were different along with different pH of wastewater at high doses,namely,it was mainly charge neutralization at low pH and co-precipitation netting at high pH and both of them work together at neutral condition.

关 键 词：镁铝复合絮凝剂 晶体结构与形态 絮凝机制 ZETA电位 

分 类 号：X703.5[环境科学与工程—环境工程]