摘要
通过改变砷的初始浓度、砷价态、细菌接种比、铁锰浓度等因素来研究不同条件下Pseudomonas putida strain MnB1原位诱导形成生物铁锰氧化物(Biogenic Fe⁃Mn oxides,BFMO)对As(Ⅲ)和As(Ⅴ)的去除效果与机制.结果表明:①当As(Ⅲ)和As(Ⅴ)初始浓度为0.5~5 mg·L^(-1)时,原位形成的BFMO对As(Ⅲ)和As(Ⅴ)有良好的去除效率,均在62%以上;②当细菌接种比为0.1%~0.5%时,As(Ⅲ)和As(Ⅴ)的去除效率与细菌接种比成正比,当细菌接种比大于0.5%时,As(Ⅲ)和As(Ⅴ)的去除效率基本维持在85%以上,未发生明显变化;③当MnCO3浓度为0.2~0.8 g·L^(-1)或Fe(Ⅱ)浓度为2.5~25 mg·L^(-1)时,原位诱导产生的BFMO对As(Ⅲ)和As(Ⅴ)的去除率随MnCO3浓度或Fe(Ⅱ)浓度的增加而增大;当MnCO3或Fe(Ⅱ)浓度再升高时,As(Ⅲ)和As(Ⅴ)的去除效率基本保持不变.微观特征分析结果表明,原位形成的BFMO与As(Ⅲ)和As(Ⅴ)反应后主要产物为As(Ⅴ),其去除主要以吸附为主,还存在共沉淀作用.总体而言,原位形成的BFMO适用于砷污染水环境的修复.
The removal efficiency and mechanism of As(Ⅲ)and As(Ⅴ)by in⁃situ formed biogenic Fe⁃Mn oxides(BFMO)by Pseudomonas putida strain MnB1 were investigated through adjusting the factors including initial arsenic(As)concentration,As valence,bacterial inoculation percent and Fe/Mn concentration.The results indicated that:①In⁃situ formed BFMO had a strong ablitiy for removing As(Ⅲ)and As(Ⅴ)from water.The removal efficiencies of As(Ⅲ)and As(Ⅱ)were more than 62%when the initial concentration of As(Ⅲ)and As(Ⅴ)was 0.5~5 mg·L-1.②The removal efficiency of As(Ⅲ)and As(Ⅴ)increased with the increasing of the bacterial inoculation ratio when the bacterial inoculation ratio was 0.1%~0.5%.The removal efficiency of As(Ⅲ)and As(Ⅴ)did not change significantly(p>0.05),above 85%,when the bacterial inoculation ratio was greater than 0.5%.③The removal rate of As(Ⅲ)and As(Ⅴ)increased with the increase of MnCO3 or Fe(Ⅱ)concentration in the presence of 0.2~0.8 g·L^(-1) MnCO3 or 2.5~25 mg·L^(-1) Fe(Ⅱ);the removal efficiency of As(Ⅲ)and As(Ⅴ)changed not significantly when the concentration of MnCO3 or Fe(Ⅱ)increased again.The microstructure analysis clearly indicated that the presence of As(Ⅴ)on in⁃situ generated BFMO surface,and the removal of As(Ⅲ)and As(Ⅴ)mainly through adsorption,following by co-precipitation.Overall,in⁃situ generated BFMO is suitable for the remediation of arsenic contaminated water environment.
作者
吴雅静
王华伟
孙英杰
吕紫娟
李书鹏
WU Yajing;WANG Huawei;SUN Yingjie;LÜ Zijuan;LI Shupeng(Qingdao Solid Waste Pollution Control and Resource Engineering Research Center,School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao 266033;National Engineering Laboratory for Site Remediation Technologies,Beijing Construction Engineering Group Environmental Remediation Co.,Ltd,Beijing 100015)
出处
《环境科学学报》
CAS
CSCD
北大核心
2021年第2期526-535,共10页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.41907111)
山东省重点研发项目(公益类)(No.2018GSF117030)。
关键词
砷污染
生物铁锰氧化物
影响因素
去除效果
机制
arsenic pollution
biogenic Fe⁃Mn oxides(BFMO)
influence factors
removal efficiency
mechanism
