Treatment of landfill leachate using magnetically attracted zero-valent iron powder electrode in an electric field

Sun, Dongni, Hong, Xiaoting, Cui, Zhonghua, Du, Yingying, Hui, K. S. ORCID: https://orcid.org/0000-0001-7089-7587, Zhu, Enhao, Wu, Keming and Hui, K. N. (2020) Treatment of landfill leachate using magnetically attracted zero-valent iron powder electrode in an electric field. Journal of Hazardous Materials, 388. ISSN 0304-3894

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Abstract

This study combined electro-oxidation (EO) and electrocoagulation (EC) process (EO/EC) to treat landfill leachate by using RuO2-IrO2/Ti plate and microscale zero-valent iron powder composite anode. EO was achieved by direct oxidation and indirect oxidation on RuO2-IrO2/Ti plate, whereas EC was achieved using iron powder to lose electrons and produce coagulants in situ. The influences of variables including type of anode material, applied voltage, zero-valent iron dosage, interelectrode gap, and reaction temperature on EO/EC were evaluated. Results showed that at an applied voltage of 10 V, zero-valent iron dosage of 0.2 g, interelectrode gap of 1 cm, and non-temperature-controlled mode, the removal efficiencies were 72.5% for total organic carbon (TOC), 98.5% for ammonia, and 98.6% for total phosphorus (TP). Some heavy metals and hardness were also removed. Further analysis indicated that the removal of TOC, ammonia, and TP followed pseudo-first order, pseudo-zero order, and pseudo-second order kinetic models, respectively. Other characteristics were examined by scanning electron microscopy–energy dispersive spectrometry, X-ray diffraction, and X-ray photoelectron spectroscopy. Overall, our results showed that EO/EC can be used to efficiently remove organic matter, ammonia, TP, and heavy metals from landfill leachate.

Item Type: Article
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Depositing User: LivePure Connector
Date Deposited: 11 Dec 2019 02:32
Last Modified: 24 Sep 2022 05:14
URI: https://ueaeprints.uea.ac.uk/id/eprint/73337
DOI: 10.1016/j.jhazmat.2019.121768

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