Permanganate-assisted pilot-scale gravity-driven membrane (GDM) filtration in treating Mn(II)-containing groundwater: Fast startup and mechanism

Ke, Zheng; Liang, Heng; Sun, Yitong; Wang, Tianli; Luo, Jiaoying; Tang, Yuchao; Li, Guibai; Tang, Xiaobin; Wang, Jinlong

doi:10.1016/j.jece.2024.112073

Journal of Environmental Chemical Engineering

2024

DOI: 10.1016/j.jece.2024.112073

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Permanganate-assisted pilot-scale gravity-driven membrane (GDM) filtration in treating Mn(II)-containing groundwater: Fast startup and mechanism

Zheng Ke,

Heng Liang,

Yitong Sun

et al.

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2024

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Manganese Oxide Enhanced Gravity-Driven Membrane (GDM) Filtration in Treating Iron- and Manganese-Containing Surface Water

Luo,

Zhang,

Chang

et al. 2024

Water

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Manganese pollution in surface water has been a new concern in decentralized drinking water treatment. The dissolved manganese cannot be effectively removed by the traditional ultrafiltration (UF) process, but will cause severe membrane fouling. To address such issues, an innovative gravity-driven membrane (GDM) coupled with a dynamic manganese oxide (MnOx) film on the membrane surface was proposed, with hopes of enhancing manganese removal and alleviating membrane fouling. The results demonstrated that pre-coating a dynamic MnOx film on the membrane surface of a GDM system would effectively reduce start-up time for removing iron and manganese pollutants, without affecting the flux stabilization of the GDM. Effective manganese removal (~80%) primarily depended on the adsorption and auto-catalytic oxidation facilitated by the pre-coating of MnOx. Furthermore, the MnOx film notably enhanced organic pollutant removal efficiency. Additionally, the MnOx coated on the membrane surface acted as a skeleton, promoting the gradual formation of a biocake layer with a heterogeneous and porous structure, which benefited the flux stabilization of the GDM. In particular, the fine and homogeneous MnOx-M derived from the backflushing water of the mature manganese sand filter exhibited precise and uniform coating on the membrane surface, effectively mitigating the irreversible pore plugging caused by organic matter penetration and thereby enhancing stable flux by ~16.3% compared to the control. This study offered a novel strategy to enhance the purification efficiency of GDM system treating manganese pollution and was expected to contribute to the technological advancement of decentralized water supply scenarios.

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Manganese Oxide Enhanced Gravity-Driven Membrane (GDM) Filtration in Treating Iron- and Manganese-Containing Surface Water

Luo,

Zhang,

Chang

et al. 2024

Water

View full text Add to dashboard Cite

show abstract

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Permanganate-assisted pilot-scale gravity-driven membrane (GDM) filtration in treating Mn(II)-containing groundwater: Fast startup and mechanism

Cited by 1 publication

References 66 publications

Manganese Oxide Enhanced Gravity-Driven Membrane (GDM) Filtration in Treating Iron- and Manganese-Containing Surface Water

Manganese Oxide Enhanced Gravity-Driven Membrane (GDM) Filtration in Treating Iron- and Manganese-Containing Surface Water

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