铁-铝盐混凝剂混合投加工艺控制溶解性残余铝的机理  

Mechanism of controlling dissolved residual aluminum in simultaneous addition of iron and aluminum salt coagulants

作　　者：李勐卓 程继夏[1] 顾军农 李玉仙 邹放 晏明全 LI Mengzhuo;CHENG Jixia;GU Junnong;LI Yuxian;ZOU Fang;YAN Mingquan(School of Water and Environment,Chang′an University,Xi′an 710054,China;Beijing Engineering Research Center for Drinking Water Quality,Beijing Waterworks Group Co.Ltd.,Beijing 100012,China;Key Laboratory of Water and Sediment Sciences,Ministry of Education,School of Environmental Science and Engineering,Peking University,Beijing 100871,China)

机构地区：[1]长安大学水利与环境学院,西安710054 [2]北京市自来水集团有限责任公司,北京市供水水质工程技术研究中心,北京100012 [3]北京大学环境科学与工程学院,教育部水沙科学重点实验室,北京100871

出　　处：《环境工程学报》2021年第2期580-587,共8页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51578007)。

摘　　要：铁-铝盐混凝剂混合投加是一种常用给水处理工艺。但由于缺乏有效表征手段,对上述工艺的内在机制认识不清。采用紫外-可见光谱法与非理想竞争吸附模型(NICA)相结合的方法,定量表征铁-铝盐凝剂混合投加时水体中溶解性有机物(DOM)特性。结果表明,铁盐(FeCl3)投加能在保证水处理效能的情况下,显著提高酚基类官能团的去除效率,并且通过竞争络合位点抑制络合态有机铝的生成量,使溶解性残余铝浓度显著降低。以上研究结果对优化混凝工艺控制具有指导意义。The simultaneous addition of iron and aluminum salt coagulants is a common water treatment process in practice.However,due to the complexity of coagulation process and the lack of effective characterizing methods,the internal mechanism of the above process is still unclear.The combination of UV-vis spectroscopy and the non-ideal competitive adsorption model(NICA)is used to quantitatively characterize the properties of the dissolved organic matter(DOM)in the water when iron and aluminum salt coagulants were simultaneously dosed.The results show that the addition of iron salt(FeCl3)could significantly increase the removal efficiency of phenolic functional groups while ensuring the efficiency of water treatment,and could inhibit the formation of complex organic aluminum through competing the complex sites,which led to the significant decrease of the dissolved residual aluminum concentration.The results are of guiding significance for optimizing the coagulation process control.

关 键 词：残余铝 溶解性有机物(DOM) 混凝 紫外-可见光谱 金属络合 

分 类 号：X52[环境科学与工程—环境工程]