不同挂膜方式成熟滤料去除地下水中As(Ⅲ)研究  

A comparative study on removal of As(Ⅲ) in groundwater by mature filter media formed in different ways

作　　者：程丽杰 黄廷林[1] 程亚[1] 李埜 CHENG Li-jie;HUANG Ting-lin;CHENG Ya;LI Ye(School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《中国环境科学》2018年第12期4524-4529,共6页China Environmental Science

基　　金：国家重点研发计划项目(2016YFC0400706);国家自然科学基金资助项目(51778521)

摘　　要：通过动力学和动态柱实验对比研究了不同挂膜方式成熟滤料去除地下水中As(Ⅲ)效能.并采用SEM-EDS?XRD及FTIR等表征手段对滤料形态和结构进行了分析.结果表明,两种滤料的形貌具有较大差异.采用化学挂膜的滤料去除As(Ⅲ)性能更优.二级动力学模型能较好地模拟两种滤料除As(Ⅲ)动力学过程,自然挂膜滤料和化学挂膜滤料拟合速率常数分别为8.568×10^(-6)和14.248×10^(-6)mg/(g·min).Yan模型对动态柱实验穿透曲线的拟合系数R^2>0.999.通过脱附再生实验,发现0.5mol/L的NaHCO_3作为脱附剂可使滤料有效再生.对比过滤前后滤料的XRD分析结果,滤料结构变化不大,除砷能力稳定.滤料表面铁锰氧化物含量直接影响滤料除As(Ⅲ)性能.两种滤料在除砷过程中均消耗了羟基.本研究为不同方法去除地下水中As(Ⅲ)提供了理论支撑,具有一定工程指导意义.A comparative study on the kinetics and column experiment of As(Ⅲ)removal from groundwater by mature filter media formed in different ways was conducted.Besides,a variety of characterization methods were used to analyze the morphology and structure of the two film filter media.The results showed that the morphology was quite different.As(Ⅲ)could be removed more effectively by the chemical film filter media.The second-order model was able to simulate the kinetics of As(Ⅲ)removal well.The fitting rate constants of natural and chemical film filter media were8.568×10^-6and14.248×10^-6mg/(g·min),respectively.The Yan model has a fitting regression coefficient of R^2>0.999for the dynamic column breakthrough curve.At the same time,the experiment of desorption and regeneration was carried out.It was found that NaHCO3as a desorbent could effectively regenerate the filter media.According to the XRD results of the filter media before and after the filtration,the surface structure did not change much,thus the arsenic removal ability is stable.The content of iron and manganese oxides on the surface of film filter media directly affects the arsenic removal performance.Both film filter media consume hydroxyl groups during the arsenic removal process.The research provides theoretical support for the removal of arsenic from groundwater by different methods and has certain engineering guidance.

关 键 词：化学挂膜滤料 自然挂膜滤料 地下水 As(Ⅲ)去除 

分 类 号：X523[环境科学与工程—环境工程]