化工进展 ›› 2022, Vol. 41 ›› Issue (11): 6130-6138.DOI: 10.16085/j.issn.1000-6613.2022-0155

• 资源与环境化工 • 上一篇    下一篇

高铁酸钾强化铁锰氧化膜过滤去除水中有机物

郭英明(), 张宇宏, 麻奔, 袁晟晨, 邱文瑄, 杨靖   

  1. 西安工程大学城市规划与市政工程学院,陕西 西安 710048
  • 收稿日期:2022-01-24 修回日期:2022-03-07 出版日期:2022-11-25 发布日期:2022-11-28
  • 通讯作者: 郭英明
  • 作者简介:郭英明(1987—),男,博士,讲师,研究方向为水处理材料及催化氧化。E-mail:guoyingming@xpu.edu.cn
  • 基金资助:
    陕西省自然科学基础研究计划(2021JQ-688);陕西省教育厅科研计划(21JK0650);陕西省科研计划(2021GY-147);陕西省大学生创新创业训练计划(S202110709073)

Removal of CODMn in water by potassium ferrate enhanced iron-manganese oxide film filtration and its influencing factors

GUO Yingming(), ZHANG Yuhong, MA Ben, YUAN Shengchen, QIU Wenxuan, YANG Jing   

  1. School of Urban Planning and Municipal Engineering, Xi’an Polytechnique University, Xi’an 710048, Shaanxi, China
  • Received:2022-01-24 Revised:2022-03-07 Online:2022-11-25 Published:2022-11-28
  • Contact: GUO Yingming

摘要:

前期研究发现铁锰氧化膜(MeO x )对水中氨氮、铁、锰等污染物具有较高的去除率,但对水中有机物(以CODMn计)的去除效果较差。为了提高MeO x 对CODMn的去除率,本研究采用高铁酸钾强化MeO x 的催化氧化过程,探究其对水中CODMn的有效去除及相关影响因素。实验结果表明:仅投加0.1mg/L的高铁酸钾强化MeO x 过滤,对于进水中20mg/L的CODMn,去除率可达到约92.5%;滤速对其具有一定的影响,去除率随着滤速的提高呈下降的趋势,在6~10m/h出水滤速中的CODMn均能达到3.0mg/L以下,当滤速达到11m/h时去除率下降到81.65%;较低的pH(约6.51)具有一定的不利影响,CODMn的去除率随着pH的降低而逐渐下降;进水中NH4+也会影响CODMn的去除,NH4+浓度越高其去除率越低。扫描电子显微镜(SEM)结果显示,高铁酸碱强化过滤约60天后,可在MeO x 的表面生成某种物质;由电子能谱(EDS)分析MeO x 表面可知,约60天后C元素和O元素的比例明显增加,Mn元素和Fe元素的比例明显降低,但MeO x 表面减少的部分铁锰物质并未影响CODMn的去除;由X射线光电子能谱(XPS)分析可知,Mn元素强化过滤前后对应的化合物主要为MnO、Mn2O3以及Mn3O4,对C、O元素分析后发现附着在MeO x 表面的物质为(CH2)4On

关键词: 高铁酸钾, 高锰酸盐指数, 强化过滤, 铁锰氧化膜

Abstract:

Previous studies have found that the iron-manganese oxide film (MeO x ) has a high removal efficiency for ammonium, iron and manganese in water, but the removal efficiency of organic matter (in CODMn) is poor. To improve the removal efficiency of MeO x for CODMn, the potassium ferrate was used to strengthen the catalytic oxidation process of MeO x, and its effective removal of CODMn and some influencing factors were explored in this study. The experimental results were showed that when only 0.1mg/L of potassium ferrate was added into the influent, the removal efficiency could be about 92.5% for 20mg/L CODMn in the influent. The filtration rate (v) had a certain influence on the removal of CODMn. The removal efficiency of CODMn would gradually decrease with increasing filtration rate, and the concentration of CODMn in the effluent could be 3.0mg/L (v=6—10m/h). When the filtration rate reached 11m/h, the removal efficiency of CODMn would reduce to 81.65%. The lower pH (about 6.51) had certain adverse effect, and the removal efficiency of CODMn would gradually decrease with the decrease of pH. The NH4+ in the influent would also affect the removal of CODMn, and the higher the concentration of NH4+, the lower the removal efficiency for CODMn. Scanning electron microscope (SEM) results indicated that some brown substances was formed on the surface of MeO x after ferric acid-base enhanced filtration for about 60 days. The surface of MeO x was analyzed by electron energy dispersive spectrometer (EDS). It was found that the proportion of C and O elements were increased and that of Mn and Fe elements were decreased significantly, but the reduced Fe and Mn species did not affect the removal of CODMn. X-ray photoelectron spectroscopy (XPS) analysis showed that the compounds corresponding to Mn elements were MnO, Mn2O3 and Mn3O4 before and after enhanced filtration, and the substances on the surface of MeO x for C and O elements was (CH2)4On .

Key words: potassium ferrate, CODMn, enhanced filtration, iron-manganese oxide film

中图分类号: 

京ICP备12046843号-2;京公网安备 11010102001994号
版权所有 © 《化工进展》编辑部
地址:北京市东城区青年湖南街13号 邮编:100011
电子信箱:hgjz@cip.com.cn
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn