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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 22, 2017
Accepted July 2, 2017

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Effects of particle size of zero-valent iron (ZVI) on peroxydisulfate-ZVI enhanced sludge dewaterability

Xu Zhou Hongyi Chen Shu-Hong Gao¹ Songfang Han Renjie Tu Wei Wei² Chen Cai² Peng Liu² Wenbiao Jin^† Qilin Wang^3†

Shenzhen Engineering Laboratory of Microalgal Bioenergy, Harbin Institute of Technology Shenzhen Graduate School, 518055 Shenzhen, China ¹Department of Microbiology and Plant Biology, University of Oklahoma, Norman, Oklahoma 73019, U.S.A., USA ²Advanced Water Management Centre, The University of Queensland, St. Lucia, Queensland 4072, Australia ³Griffith School of Engineering, Griffith University, Nathan, QLD 4111, Australia

jinwb@hit.edu.cn

Korean Journal of Chemical Engineering, October 2017, 34(10), 2672-2677(6), 10.1007/s11814-017-0187-x

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Abstract

The advanced oxidization process has proven to be an effective conditioning technique for the improvement of sludge dewaterability. Zero-valent iron (ZVI) is often used as the catalyst of the oxidization process. This study applied ZVI with different particle sizes to the ZVI- peroxydisulfate reactions, and investigated their effects on the improvement of sludge dewaterability. It was found that ZVI particles with smaller sizes (100 and 400 meshes) led to slightly higher enhancement of sludge dewaterability (69.1%-72%) than the larger size particles (20-40 meshes) with the reduction rate of CST by 64%. However, after the treatment, the recycle rate of larger size ZVI particles was obviously higher than the small sizes ZVI particles: 98.3% vs. 87.6-89.7%. Different surface areas of the ZVI particles with different sizes might contribute to the phenomenon. For the small ZVI particles with the sizes of 100 and 400 meshes, no obvious differences of oxidization effects and the improvements of sludge dewaterability were found between them, which might be because an oxide layer could have been formed on the surface of fine ZVI particles and led to agglomeration. According to the economical analysis, the small particles (100 and 400 meshes) of ZVI were more economically favorable for the oxidative conditioning process with ZVI-peroxydisulfate than large ZVI particles (20-40 meshes).

Keywords

Waste Sludge Dewaterability Peroxydisulfate Zero-valent Iron Particle Sizes

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