酸浸粉煤灰制备复合混凝剂及其处理生活污水的效果研究  

Preparation of a Composite Coagulant from Fly Ash and Its Application in Domestic Wastewater Treatment

作　　者：李亚强[1] 胡凯[1] 赵庆良[1] 汤凤[1] 刘志刚[1] 崔福义[1] 

机构地区：[1]哈尔滨工业大学市政环境工程学院城市水资源与环境国家重点实验室,哈尔滨150090

出　　处：《环境科学》2007年第11期2507-2514,共8页Environmental Science

基　　金：教育部'长江学者与创新团队发展计划'项目;哈尔滨市环境保护局科技攻关项目(2006)

摘　　要：研究了以粉煤灰和H2SO4为原料,常温常压下搅拌反应制备复合混凝剂的方法,考查了酸种类、酸浓度、酸灰比、搅拌时间等因素对Fe3+、Al3+溶出效果和生活污水混凝效果的影响.结果表明,酸灰比5 mL/g、浓度2 mol/L的H2SO4溶液与粉煤灰搅拌4 h并静置30 min后制得的混凝剂,其中Fe3+的浓度为0.0108 mol/L,溶出率为11.4%;Al3+的浓度为0.0354 mol/L,溶出率为4.3%;对生活污水的COD去除率70.4%,SS去除率91.9%,与市售聚合混凝剂效果相当,是一种有开发利用价值的水处理剂.Fly ash was investigated as a raw material for the preparation of a composite coagulant with sulfuric acid. Types of acid solution, H2 SO4 concentration, ratio of H2 SO4 to fly ash and stirring time were respectively examined as factors that influenced the efficiency of converting the iron and aluminum components into a composite coagulant and coagulation performance on domestic wastewater. The coagulant was attained at the condition of H2SO4^- fly ash ratio of 5 mL/g, H2SO4 of 2 mol/L, stirring time of 4h and stabling time of 30 min, and contained Fe^3＋ of 0.0108 mol/L with conversion efficiency of 11.4% and Al^3＋ of 0.0354 mol/L with conversion efficiency of 4.3%. Removal efficiencies of COD and SS by this type of coagulant reached 70.4 % and 91.9 % respectively when treating domestic wastewater. This study provides a promising means to utilize fly ash for coagulation, which possibly makes wastewater treatment more economical and more sustainable.

关 键 词：粉煤灰 铁铝溶出率 混凝剂 生活污水 

分 类 号：X505[环境科学与工程—环境工程] X703.5