Removal of soluble divalent manganese by superfine powdered activated carbon and free chlorine: Development and application of a simple kinetic model of mass transfer–catalytic surface oxidation

Water Research X

article

Shun Saito¹  Yoshihiko Matsui¹  Nobutaka Shirasaki¹  Taku Matsushita¹ 

[1] Graduate School of Engineering, Hokkaido University

关键词: Activated carbon;    Oxidation;    Adsorption;    Film mass transfer;    Eley-Rideal;   

DOI  :  10.1016/j.wroa.2022.100153

学科分类：社会科学、人文和艺术（综合）

来源: Academic Press

【 摘 要 】

Catalytic oxidative removal of Mn 2+ on activated-carbon surfaces by free chlorine was recently discovered and found to be potentially practicable for water treatment when using micrometer-sized activated carbon. Herein, we newly derived a kinetic model for trace-substance removal by catalytic reaction and applied it to the Mn 2+ removal. External-film mass transfer, adsorption, and oxidation/desorption contributed similarly to the Mn 2+ removal rate under actual practical conditions. The low removal rate in natural water was attributed to decreases in available adsorption sites: e.g., a 50% decrease in available sites in water with 0.26 mmol-Ca 2+ /L caused a 15% reduction in removal rate. Low temperature greatly reduced the removal rate by both enhancing the decrease in available sites and hindering mass transfer through increased viscosity. While adsorption sites differed 8-fold between different carbon particles, causing a 2.2-fold difference in removal rates, carbon particle size was more influential, with a >10-fold difference between 2- and 30-μm sizes.

【 授权许可】

CC BY|CC BY-NC-ND