工业水处理 ›› 2022, Vol. 42 ›› Issue (9): 72-78. doi: 10.19965/j.cnki.iwt.2021-1222

• 试验研究 • 上一篇    下一篇

给水厂污泥对重金属竞争吸附探究

仇付国(), 王肖倩, 童诗雨, 吕华东   

  1. 北京建筑大学城市雨水系统与水环境教育部重点实验室,北京 100044
  • 收稿日期:2022-03-03 出版日期:2022-09-20 发布日期:2022-09-28
  • 作者简介:

    仇付国(1974— ),博士,教授。电话:13366839519,E-mail:

  • 基金资助:
    国家自然科学基金资助项目(51278024)

Explore the competitive adsorption of heavy metals by water treatment residual

Fuguo QIU(), Xiaoqian WANG, Shiyu TONG, Huadong LÜ   

  1. Key Laboratory of Urban Stormwater System and Water Environment of Ministry of Education,Beijing University of Civil Engineering and Architecture,Beijing 100044,China
  • Received:2022-03-03 Online:2022-09-20 Published:2022-09-28

摘要:

探究了pH、反应时间和污泥投加量对给水厂污泥竞争吸附Pb(Ⅱ)、Hg(Ⅱ)、Cr(Ⅵ)、Cd(Ⅱ)4种重金属离子的影响。分析实验结果表明,重金属离子自身的相对原子质量、离子半径、电负性及水解常数都将影响其与给水厂污泥间的亲和力〔Pb(Ⅱ)>Hg(Ⅱ)>Cd(Ⅱ)>Cr(Ⅵ)〕。当Pb(Ⅱ)、Hg(Ⅱ)、Cd(Ⅱ)处于同一体系时,各离子间存在较强的竞争吸附,Cr(Ⅵ)和Hg(Ⅱ)具有相互协同作用;吸附竞争能力较弱的重金属离子的去除率可以通过增加给水厂污泥的投加量来提高。给水厂污泥对重金属离子的吸附机理包括发生共沉淀现象、重金属离子与给水厂污泥的表面官能团发生络合反应、形成分子间范德华力以及给水厂污泥的多孔结构使Hg(Ⅱ)发生污泥内扩散。

关键词: 给水厂污泥, 竞争吸附, Pb(Ⅱ), Hg(Ⅱ), Cr(Ⅵ), Cd(Ⅱ)

Abstract:

The effects of pH,contact time and sludge dosage on the competitive adsorption of Pb(Ⅱ),Hg(Ⅱ),Cr(Ⅵ) and Cd(Ⅱ) on water treatment residual(WTR) were studied. The results showed that the atomic weight,radius,electronegativity and hydrolysis constant of heavy metal ions would affect the affinity between heavy metal ions and sludge〔Pb(Ⅱ)>Hg(Ⅱ)>Cd(Ⅱ)>Cr(Ⅵ)〕. When Pb(Ⅱ),Hg(Ⅱ),Cd(Ⅱ) were in the same system,there was strong competitive adsorption among the ions,and Cr(Ⅵ) and Hg(Ⅱ) had synergistic effect. The removal rate of heavy metal ions with weak adsorption competitiveness could be improved by increasing the dosage of WTR. The adsorption mechanism of heavy metal ions on WTR included coprecipitation,complexation reaction with surface functional groups of WTR,formation of intermolecular Van Der Waals force and porous structure of WTR,which makes Hg(Ⅱ) diffuse inside the WTR to remove it.

Key words: water treatment residual, competitive adsorption, Pb(Ⅱ), Hg(Ⅱ), Cr(Ⅵ), Cd(Ⅱ)

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