铁磷共沉淀去除水中磷酸根的效果及机制  

Effect and Mechanism of Phosphate Removal by Iron-Phosphorus Coprecipitation

作　　者：柳开颜 卢磊 彭唐鑫彦 熊羽彤 刘孝利[1] 彭芸 刘闯 刘颖华 胡海波 彭梅楷 郭晓辉 杜辉辉 雷鸣[1] LIU Kaiyan;LU Lei;PENG Tangxinyan;XIONG Yutong;LIU Xiaoli;PENG Yun;LIU Chuang;LIU Yinghua;HU Haibo;PENG Meikai;GUO Xiaohui;DU Huihui;LEI Ming(College of Environment and Ecology,Hunan Engineering&Technology Research Center for Irrigation Water Purification,Hunan Agricultural University,Changsha 410128,China;Department of Water Ecological Environment,Zhuzhou Bureau of Ecological Environment,Zhuzhou 412007,China;Lukou Ecological Environment Monitoring Station,Zhuzhou 412501,China)

机构地区：[1]湖南农业大学环境与生态学院,湖南省灌溉水源水质污染净化工程技术研究中心,湖南长沙410128 [2]株洲市生态环境局水生态环境科,湖南株洲412007 [3]株洲市渌口生态环境监测站,湖南株洲412501

出　　处：《湖南生态科学学报》2024年第1期31-38,共8页Journal of Hunan Ecological Science

基　　金：生态环境部长江生态环境保护修复城市驻点跟踪研究(2022-LHYJ-02-0507-01);湖南省大学生创新训练计划项目(S202310537047)。

摘　　要：【目的】探究环境条件改变对铁盐除磷的影响及潜在机理,为污水除磷方法的开发和应用提供理论基础。【方法】利用宏观除磷试验探明不同pH、铁磷摩尔比对水体磷酸根去除的影响;结合X-射线衍射(XRD)及热力学模型,探究化学沉淀和吸附过程中磷的去除机制。【结果】随着pH升高,磷去除率先上升后下降;随铁磷摩尔比升高,磷的去除率呈现上升趋势;当反应条件为pH=5、铁磷摩尔比3∶1时,磷的去除率最高,为89.42%。XRD和热力学模型结果表明,磷主要通过形成铁-磷沉淀,如FePO4,或被铁氧化物吸附,达到从水体中去除的目的。【结论】在铁盐除磷的过程中,共沉淀和吸附两种机制并存。pH对这两种机制均有影响,而铁磷摩尔比则主要通过调控磷的吸附过程来改变磷的去除效率。【Objective】This experiment explores the influence of environmental conditions on phosphorus removal by Fe salts and its potential mechanism,which provides a theoretical basis for the development and application of phosphorus removal technology from wastewater.【Method】The effects of different pH values and Fe/P molar ratios on phosphate removal were investigated by macroscopic phosphorus removal tests.The mechanism of phosphorus removal during chemical precipitation and adsorption was investigated by X-ray diffraction(XRD)and thermodynamic model.[Result]With the increase in pH,P removal first increased and then decreased.With the increase of Fe/P ratio,the phosphorus removal rate showed an increasing trend.When the reaction conditions were pH=5 and Fe∶P=3∶1,the P removal rate was the highest and reached 89.42%.XRD characterization and thermodynamic model results showed that P was removed from the liquid phase mainly through the formation of Fe-P precipitates,such as FePO_(4),or being adsorbed by iron oxides.【Conclusion】The two mechanisms of coprecipitation and adsorption exist in the process of phosphorus removal by iron salt.Among them,pH has an effect on both of them,and Fe/P molar ratio mainly affects the adsorption to change the removal efficiency of phosphorus.

关 键 词：铁盐除磷 共沉淀 吸附 热力学模型 污水除磷 铁磷摩尔比 

分 类 号：TQ138.11[化学工程—无机化工] X52[环境科学与工程—环境工程] X703