Chemical oxygen demand oxidation via sustained-release persulfate balls: a rate-compatibility study of flow velocity, releasing, and oxidation  

作　　者：Bate BATE Danting ZHANG Jianshe YE Min XIA Yixin YANG Shuai ZHANG 

机构地区：[1]Institute of Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China [2]Shanghai Envirunion Eco-technology Co.,Ltd.,Shanghai 201106,China [3]China Railway Eryuan Engineering Group East China Survey and Design Co.,Ltd,Hangzhou 310043,China [4]The Architectural Design&Research Institute of Zhejiang University Co,Ltd.,Hangzhou 310027,China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2024年第9期749-762,共14页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：Ministry of Science and Technology of China(Nos.2019YFC1805002 and 2018YFC1802300);National Natural Science Foundation of China(Nos.42177118 and 51779219);Basic Science Center Program for Multiphase Evolution in Hypergravity of the National Natural Science Foundation of China(No.51988101);Overseas Expertise Introduction Center for Discipline Innovation(No.B18047),China.

摘　　要：Identification of chemical oxygen demand(COD)in municipal solid waste(MSW)landfill leachates is a challenging problem.This paper investigated the feasibility of using sodium persulfate(PS),a strong oxidant,as a permeable reactive barrier(PRB)filling material.Firstly,sustained-release persulfate balls were manufactured to adjust the release rate of persulfate,the oxidation agent.In addition,Fe(II)-loaded activated carbon(Fe-AC)was used to help with an even distribution of Fe(II)in the porous medium(PRB in this case).Then,the oxidation efficiency and kinetic rate of COD removal by the sustained-release balls were subjected to batch tests.A mass ratio of 1:1.4:0.24:0.7 for PS:cement:sand:water was the most efficient for COD removal(95%).The breakthrough curve for a 5 mm sustained-release ball revealed that the retardation factor was 1.27 and that the hydrodynamic dispersion coefficient was 15.6 cm^(2)/d.The corresponding half-life of COD oxidation was 0.43 d,which was comparable with the half-life of PS release from sustained-release balls(0.56 d).The sustained-release persulfate balls were shown to be an economical material with a simple recipe and production method when catalyzed by Fe-AC.Compared with cutting-edge methods,sustained-release balls used in PRBs offer significant advantages in terms of both effectiveness and economy for the preparation of sustained-release and catalytic materials.These results verified the feasibility of using sustained-release persulfate balls as a PRB material for COD removal.

关 键 词：Chemical oxygen demand(COD) Sodium persulfate(PS) Sustained-release balls Permeable reactive barrier(PRB) Fe(II)-loaded activated carbon(Fe-AC) 

分 类 号：X52[环境科学与工程—环境工程]