高碱度水库水混凝过程中残留铝控制  

Control of residual aluminum during coagulation in treatment of reservoir source water with high alkalinity

作　　者：郭婷婷[1,2] 刘锐平[1] 易秀[2] 陈桂霞[3] 胡承志[1] 

机构地区：[1]中国科学院生态环境研究中心环境水质学国家重点实验室,北京100085 [2]长安大学环境科学与工程学院,西安710064 [3]华北水利水电学院环境与市政工程学院,郑州450011

出　　处：《环境工程学报》2013年第3期836-842,共7页Chinese Journal of Environmental Engineering

基　　金：国家"水体污染控制与治理"科技重大专项(2009ZX07419-005);北京市教育委员会共建项目专项资助

摘　　要：针对高碱度水库水源的某水厂残留铝超标问题,选取碱化度(B)与Alb含量不同的3种铝盐絮凝剂,研究不同投量与pH值下混凝效果与残留铝浓度水平。结果表明,碱化度和Alb含量显著影响混凝效果。DOC和浊度的去除率随着3种絮凝剂AlCl3(B=0)、PACl-1(B=1.2)、PACl-2(B=2.2)投量增大而升高。3种絮凝剂投量在1.5～2.0 mg/L(以铝计)范围内,总铝和溶解铝含量最低。对于该水厂自制的絮凝剂PACl-2,可通过降低絮凝剂碱化度,或将水的pH值降低至7～7.5之间,以此可以提高PACl-2混凝效果,而且可以降低出厂水残留铝浓度。考虑工程应用可行性,可优先考虑调整絮凝剂生产工艺。To minimize the residual aluminum （A1） levels in the effluent of a drinking water treatment plant （DWTP） with reservoirs source water of high alkalinity, the coagulation performances and the residual A1 concentrations using three floeeulants,with different basieity （B） and A1b content,were investigated under varibale A1 doses and pH. The results indicate that the basicity and A1b content significantly affect coagulation behaviors. The removal efficiency of DOC and turbidity increases with elevated doses of A1C13 （B = 0） , PACI-1 （B = l. 2） , and PAC1-2 （B = 2.2）. The concentrations of total A1 and dissolved A1 are the lowest at A1 doses of 1.5 - 2.0 mg/L for three flocculants. As for the PAC1-2, which is prepared by this DWTP, both strategies of decreasing the basieity of floceulant and adjusting the solution pH to 7 - 7.5 are useful to enhance the coagulation performances and to decrease the residual A1 levels. Moreover, the adjustment of flocculant preparation is preferred in the future annlication.

关 键 词：混凝 残留铝 高碱度水 铝形态分布 

分 类 号：X524[环境科学与工程—环境工程]