聚合氯化铝铁的形态分布对微污染源水混凝效果的影响  

Distribution of aluminum iron chloride species and its impacts on coagulation effectiveness

作　　者：雷国元[1] 徐桂芹[1] 马军[2] 

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]哈尔滨工业大学市政与环境工程学院,黑龙江哈尔滨150090

出　　处：《环境污染与防治》2007年第8期565-570,共6页Environmental Pollution & Control

基　　金：国家"十五"重点科技攻关课题"城镇水环境关键技术"(No.2002BA806B04)

摘　　要：针对微污染源水中浊度、叶绿素a等的强化去除问题,研究了碱化度、铝铁比和加碱方式等对聚合氯化铝铁形态分布的影响,并考察了形态分布与混凝除污效率和混凝沉淀出水中残铝浓度的关系。结果表明:在铁摩尔分数一定时,混凝剂中单体、中等聚合物和无定形凝胶含量与碱化度存在线性相关性,并推导出中等聚合物含量的计算公式;在碱化度一定时,混凝剂中单体、中等聚合物和无定形凝胶含量与铁摩尔分数也存在线性相关性;增加碱化度或降低铁摩尔分数,可以增加中等聚合物含量、降低单体含量,从而影响混凝除污效率和混凝沉淀后出水中残铝浓度。混凝实验结果表明,混凝过程中叶绿素a去除率和浊度去除率均与混凝剂中中等聚合物含量存在线性相关性,但两者相关系数不同。混凝沉淀后出水中残铝浓度与混凝剂中单体含量存在线性相关性。因此,预聚合的无机高分子混凝剂对提高混凝过程中的除浊、除藻效率,降低混凝沉淀后出水中残铝浓度具有重要的意义。Using a polymeric aluminum iron chloride（PAFC） coagulant, series of coagulation experiments were performed on micro-polluted water to determine the effects of coagulant solution preparation （adding the base）, basicity （OH^-/（Al^3＋ ＋ Fe^3＋ ））,and the iron to aluminum ratio on the resulting species distribution, residual A1 concentration, and removal of turbidity and algae cells （chlorophyll）. The percentages of monomeric, polynuclear and gel species were all linear functions of basicity at a given iron to aluminum ratio. The formula for estimating the percentage of polynuclear species was defined. Increasing basicity and/or decreasing the iron to aluminum ratio increased percentage of polynuclear species, lowered the percentage of monomeric species, and affected both the treatment performance and the residual aluminum concentration of the effluent. The turbidity and chlorophyll removal rates were linear functions of the percentage of polynuclear species, while the residual Al concentration was a linear function of the percentage of monomeric species during coagulation. The experimental results have demonstrated that degree of polymerization of inorganic coagulants in the coagulant solution preparation stage affects the turbidity and algae removal rates and the residual aluminum concentration in coagulation effluent.

关 键 词：聚合氯化铝铁 微污染源水 藻细胞 形态分布 水处理 

分 类 号：TU991.2[建筑科学—市政工程]