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

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

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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 cm2/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.

Chemical oxygen demand(COD)Sodium persulfate(PS)Sustained-release ballsPermeable reactive barrier(PRB)Fe(Ⅱ)-loaded activated carbon(Fe-AC)

Bate BATE、Danting ZHANG、Jianshe YE、Min XIA、Yixin YANG、Shuai ZHANG

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Institute of Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China

Shanghai Envirunion Eco-technology Co.,Ltd.,Shanghai 201106,China

China Railway Eryuan Engineering Group East China Survey and Design Co.,Ltd.,Hangzhou 310043,China

The Architectural Design & Research Institute of Zhejiang University Co.,Ltd.,Hangzhou 310027,China

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2024

10.1631/jzus.A2300372

浙江大学学报(英文版)(A辑:应用物理和工程)
浙江大学

浙江大学学报(英文版)(A辑:应用物理和工程)

CSTPCD
影响因子：0.556
ISSN：1673-565X
年,卷(期)：2024.25(9)